A constant rate of increase ( r_Inst ) for a population produces a growth curve that is J-shaped because the population accumulates more new individuals per unit of time,
What does the J curve represent about population growth ?J-shaped development curve A graph curve that depicts the circumstance in which an organism's population density develops fast in an exponential (logarithmic) form in a new habitat, but then abruptly stops due to environmental resistance (e.g. seasonality) or some other factor.
What causes a S shaped logistic growth curve for a population ?When resources are scarce, populations expand logistically. Population increase in logistic growth diminishes as resources become scarce, and ultimately levels off when the carrying capacity of the ecosystem is met, resulting in an S-shaped curve.
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organisms that consume only plants are any/all of the following: group of answer choices first order heterotroph secondary consumer primary consumer second order heterotroph producer herbivore
First-order heterotrophs, primary consumers, and herbivores are the organisms that consume only plants.
The trophic level is a hierarchical position in a food chain or food web of an ecosystem. The organisms at a trophic level share similar feeding habits. There are generally three trophic levels:
1. First trophic level
This level comprises the primary producers or the green plants. They perform photosynthesis and use carbon dioxide and water for the synthesis of their food.
2. Second trophic level
The organisms of this level feed upon the organisms of the first trophic level. This means that they feed upon plants. These include primary consumers, herbivores, and first-order heterotrophs.
3. Third trophic level
The organisms of the third trophic level feed upon the organisms of the second trophic level. These include secondary consumers and second-order heterotrophs.
A heterotroph is an organism that does not prepare its food itself but is dependent on the other organism. First-order heterotrophs are thus primary consumers or herbivores that consume only plants.
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How does the change in ACTH levels between 1:00 and 6:00 a.m. for the surprise protocol compare to that for the short and long protocols? Does this result support the hypothesis being tested? Explain.
The change in ACTH levels between 1:00 am and 6:00 am during the surprise protocol was comparable to the long protocols when compared to the short and long procedures.
The change in ACTH levels post-waking was assessed using samples collected at awakening and 30 minutes later. 15 healthy people in their mid-20s were observed by researchers over the course of three nights.
Every participant was informed whether they would be awakened at 6:00 or 9:00 am each morning. The participants went to bed at midnight. Both the "short" and "long" protocol groups were awakened simultaneously.
Humans produce more adrenocorticotropic hormone (ACTH) during the late stages of normal sleep, with the peak production occurring just before spontaneous awakening.
In response to stressful circumstances, the human body releases the hormone ACTH.
Based on the findings of the experiment, the long procedure for waking up was projected at 9 am, and the actual awakening time was 9 am. In a nutshell, the short protocol called for getting up at 6 am, and that's exactly when people actually woke up.
Therefore, nothing was altered. However, at 6:00 am, those involved in the surprise routine were awakened. At 9:00 am, they anticipated being startled and subjected to protracted processes.
The results suggest that ACTH secretion occurs before to actual awakening rather than at the time of expected waking.
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Which of the following sensory receptors is incorrectly paired with its category? a. hair cell-mechanoreceptor b. muscle spindle-mechanoreceptor c. taste receptor-chemoreceptor d. olfactory receptor-electromagnetic receptor
Answer: B
Explanation:
does temperature affect the number of drops needed for surface tension on a penny.
A characteristic of liquids is surface tension. Surface tension refers to a liquid's limited capacity to resist an external force.
Even though they may be much denser than the liquid, we see items float on liquids and insects walk on lakes' surfaces due to surface tension. Van der Waal forces produce surface tension. Van der Waal forces are referred to as inter-molecular forces because they exist between the molecules of a single substance, such as water.
With an increase in temperature, the surface tension falls. The critical temperature of the liquid is the temperature at which the surface tension of the liquid is zero.
Key factors affecting Surface tension:
Temperature ↑ surface tension ↓Critical temperature Surface tension: ZeroThe critical temperature of the water is 3744KIncrease with impurity.Learn more about Surface Tension here:
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Who is credited with being the father of the modern u. S. Wilderness conservation?.
Gifford Pinchot, the founding director of the U.S. Forest Service, was born on Saturday. He is referred to as the "father of conservation" and is credited with starting the conservation movement in the US by persuading people to protect the future by preserving the past.
The Sierra Club was founded by American naturalist John Muir (1838–1914), who is regarded as the grand father of conservation. He pushed to establish Yosemite National Park and protect the Sierra Nevada in California. Leopold joined the U.S. Forest Service after graduating from Yale and was placed in the Arizona Territories. During his time in office.
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The peritoneal cavity is located between the visceral peritoneum and the mesentery. True or false
The peritoneal cavity is located between the visceral peritoneum and the parietal peritoneum. So the statement is false.
What is the peritoneal cavity?The peritoneum is a serous membrane that covers the abdominal and pelvic organs and borders the walls of the abdominal cavity. The peritoneal cavity lies between its parietal and visceral layers. Abdominopelvic organs are supported and shielded by the peritoneum.
There are two layers to the peritoneum:
An external layer that is attached to the front and posterior abdominal walls is called the parietal peritoneum.A layer that lines the internal organs of the abdomen is called the visceral peritoneum. It is created when the parietal peritoneum rebounds from the viscera to the abdominal wall.Therefore the statement is false.
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Why is a temperature of 106 dangerous?
Answer:
Hyperpyrexia, or fever of 106°F or higher, is a medical emergency. If the fever is not lowered, organ damage and death can result.
Explanation:
Answer: A fever of 106°F or higher, is very dangerous because if it is not lowered, organ damage and death can result.
Explanation:
Where are chromosomes that contain dna found? inside a person’s genes on the outside of a gamete in the nucleus of a cell around the double helix structure
The chromosomes that contain DNA are found inside the cell nucleus (in eukaryotic organisms).
What are chromosomes?The chromosomes can be defined as linear fragments of DNA of an organism that contain specific sequences of nucleotides that determine gene sequences and they are found within the cell nucleus.
Chromosomes are fragments of the genome, they are located in the cell nucleus where transcription of genes and subsequent use of these transcripts (mRNAs) during translation leads to the production of proteins.
In conclusion, the chromosomes that contain DNA are found inside the cell nucleus (in eukaryotic organisms).
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Answer:
nucleus
Explanation:
cause i said
Why are phytoplankton, and not benthic algae or rooted aquatic plants, the dominant photosynthetic organisms of the oceanic pelagic zone? (See Figure 52.14 .)
An organism is referred to as photosynthetic if it participates in photosynthesis. Plants, algae, and cyanobacteria perform photosynthesis.
Photoautotrophs use light, specifically sunshine, to manufacture their food. In that they have chlorophyll and require sunlight to survive and thrive, microalgae, also known as phytoplankton, are comparable to terrestrial plants. Since it is mostly buoyant, phytoplankton floats in the upper layers of the ocean where sunlight penetrates the water. In order to transform these resources into proteins, lipids, and carbohydrates, they also require inorganic nutrients like nitrates, phosphates, and sulfur.The open sea area outside of the coasts or on the ocean floor made up of the water column is referred to as the pelagic zone. Pelagic fish live in the oceans below the continental shelf. Pelagic fish are those that live in the pelagic zone, hence their name.In the photic zone, which is quite shallow, plankton and a variety of fish species reside. Because water readily absorbs light and the ocean is deep, the majority of the ocean (the aphotic zone) is dark and devoid of life.Learn more about the Phytoplankton with the help of the given link:
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SCIENCE, TECHNOLOGY, AND SOCIETY Extensive irrigation in arid regions causes salts to accumulate in the soil. (When water evaporates, salts that were dissolved in the water are left behind in the soil.) Based on what you learned about water balance in plant cells, explain why increased soil salinity (saltiness) might be harmful to crops.
Water leaves the plant cells and they become flaccid.
What happens when salt enters into the cells?We know that osmosis refers to the movement of solvent from the region where the solvent molecules are at lower concentration, the the region where the solvent molecules are at higher concentration across a semipermeable membrane.
Now, the cells have water in them. When salt gets into the cell, the salt becomes more concentrated (hypertonic) than the cell. This would make water to leave the cell and get into the incoming salt water.
As such, as water leaves the plant cells, the plant cells would become flaccid.
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A tough layer of vascular connective tissue, called the ______________________, covers the bone and is continuous with ligaments and tendons.
A tough layer of vascular connective tissue, called the Periosteum, covers the bone and is continuous with ligaments and tendons.
What is vascular connective tissue?It is a type of tissue that is accountable for the transportation in the animal's body. It is also anointed fluid connective tissue. It maintains continuity in the animal body by combining different parts of the body. It has two kinds, and they are blood and lymph.
What is an representative of vascular connective tissue?
Blood: It is a sticky, thick, and saltish vascular connective tissue. It is also named red vascular connective tissue because it is red-colored. It consists of two components that are blood cells and blood plasma.
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digestion of energy nutrients requires specific enzymes for each molecule. which of the following enzymes is incorrectly matched with its corresponding molecule?
The enzyme that is responsible for the digestion of sucrose will be sucrase.
What is sucrose?Sucrose is a disaccharide that will be formed by glucose and fructose (which are monosaccharides), which will be known as table sugar, white sugar. It is a natural sweetener that is used to sweeten foods.
In digestion, in order to be absorbed by the intestinal cells, it must be broken down into the momsaccharides that are going to make it up, glucose and fructose. This action will take place thanks to the enzyme sucrase, which is what catalyzes this reaction. These enzymes are found in the membrane of the microvilli of the cells of the duodenum, allowing it to enter the bloodstream in the form of glucose and fructose.
Therefore, we can confirm that the enzyme that is responsible for the digestion of sucrose will be sucrase.
Digestion of energy nutrients requires specific enzymes for each molecule. Which is the following is incorrectly matched with its corresponding molecule?
A. Fats-lipase
B. Sucrose-maltase
C. Starch-amylase
D. Lactose-lactase
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Consider the effect of adding potassium or chloride channels to the membrane in (b). How would the membrane potential be affected in each case?
Potassium or chloride channels to the membrane in the resting membrane potential became less negative.
The passage of ions into and out of the cell and across the membrane is related to the way that impulses are conveyed along nerve cells, which are also referred to as neurons.
All ions are electrically charged, either negatively or positively. A potential is actually just a charge differential. As a result, the membrane potential is a voltage-based measurement of the differential in charge across the nerve cell membrane.
When the nerve cell is at rest and not transmitting an impulse, this charge differential is known as the resting membrane potential.
A nerve impulse is communicated via the passage of ions into the cell. Since a nerve impulse involves a change in charge brought on by the passage of charged ions into and out of a cell across a membrane, it is also referred to as a nerve action potential.
The resting membrane potential will become less negative as the number of potassium ions presents extracellularly rises.
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Betty's metabolism has been irregular and she has been moody, tired, and weak. there is most likely an abnormality with her _____ gland.
According to the research, the correct option is thyroid. Betty's metabolism has been irregular and she has been moody, tired, and weak. There is most likely an abnormality with her thyroid gland.
What is thyroid gland?It is an organ located in the anterior region of the neck formed by two bilateral lobes and is responsible for producing hormones and regulating the body's sensitivity to them.
In this sense, it is responsible for multiple functions, among the main ones giving energy to the body, regulating metabolism, when there is an abnormality in this, problems of nervousness, muscle cramps, fatigue, weight loss, irritability, bowel movements usually occur.
Therefore, we can conclude that according to the research, the correct option is thyroid. Betty's metabolism has been irregular and she has been moody, tired, and weak. There is most likely an abnormality with her thyroid gland.
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many proteins are secreted from the cell following the process of translation. list two organelles involved in protein secretion, and briefly explain their contributions.
many proteins are secreted from the cell following the process of translation.the two organelles involved in protein secretion and their contribution are The rough endoplasmic reticulum modifies the proteins. The Golgi apparatus is involved in sorting, modifying, and packaging proteins. Vesicles transport the proteins to the plasma membrane and release them from the cell.
The endoplasmic reticulum is, in essence, the transportation system of the eukaryotic cell, and has many other important functions such as protein folding. It is a type of organelle made up of two subunits – rough endoplasmic reticulum, and smooth endoplasmic reticulum.here the Golgi apparatus, also known as the Golgi complex, Golgi body, or simply the Golgi, is an organelle found in most eukaryotic cells. Part of the endomembrane system in the cytoplasm, it packages proteins into membrane-bound vesicles inside the cell before the vesicles are sent to their destination.to know more about Golgi apparatus click here
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briefly explain how an endonuclease (like cas9) compares to a restriction enzyme (like haeiii or bcli). what is a similarity? what is a difference?
In comparison , Cas9 is an endonuclease and is developed as an immunity mechanism against viruses, which are not considered restriction enzymes.
Talking about the similariites and differences, endonuclease is an enzyme by cleaving the internal covalent bonds linking nucleotides to break down a nucleotide chain into shorter chains, whereas the restriction enzyme, considered the restriction endonuclease can cleave DNA molecules into small pieces. Cas9 is an endo-deoxyribonuclease, it trims the DNA a little bit, from the cut site, one of the differences is that to identify the target sites in the DNA restriction enzymes doesn't have an RNA or a DNA as a tether. They can recognize the restriction sites by themselves through their DNA binding domains. Compare to restriction enzymes, the endonuclease can't cleave any DNA complementary to the guide RNA, they need the help of protospacer adjacent motifs adjacent sequences to the target site. The cleaving process occurs at a specific site called the restriction site, of the DNA molecule, where the site is composed of 4 to 8 base pairs. The restriction enzyme is all about all in one system whereas the endonuclease enzyme recognizes first and cleaves the latter, within a specific nucleotide sequence.
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The glands that are saclike in structure and produce oily secretions that lubricate the skin are?
The glands that are saclike in structure and produce oily secretions that lubricate the skin are sebaceous glands.
Glands are the organs present in the body that produce and secrete some chemical substances. These chemical substances are necessary for various processes in the body. Glands can be of two types: Endocrine, which releases secretions directly into the blood and exocrine, that release secretions into some duct or opening.
Sebaceous glands are the exocrine gland that secrete a substance called sebum. Sebum is an soil, wax-like substance that functions to lubricate the hair and skin. The gland opens into the root of hair follicle and is present only in mammals. The maximum sebaceous glands are found in the scalp.
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If you made Jupiter the size of a marble, how would that change the size of the Earth? Sun?
Answer:
It would change the size of both the planets and make them smaller
Explanation:
If you make Jupiter's size into a marble, then you would have to make both of the planets smaller size as well. It would change the size of the sun by a lot, but it would still have to be bigger than Jupiter. The earth is different tho since it's way smaller than Jupiter in its normal size. So the earth would be super smaller than marble.
If you were to scale down Jupiter to the size of a marble, it would have a diameter of roughly 1.39 centimeters (or about 0.55 inches).
What are the planets?The relative diameters of the Earth and the Sun do not alter appreciably, even when Jupiter's size is drastically shrunk to that of a tiny pebble.
The enormous scale disparity between the celestial bodies in our solar system is highlighted by the Sun, which is still considerably larger than both Earth and the marble-sized Jupiter as shown
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Define close circuit.
Answer:
closed circuit. noun. a complete electrical circuit through which current can flow when a voltage is appliedCompare open circuit.Answer:
A close circuit is a circuit that lets current go through it without stopping.
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the role of Ca²⁺ in the contraction of a skeletal muscle fiber and a smooth muscle cell.
Ca2+ is essential for the excitation-contraction coupling process in skeletal muscle fibres, which produces the action potential of the muscle fibre, as well as numerous other processes, including fibre type switching, myosin-actin cross-linking, protein synthesis, protein degradation, mitochondrial adaptations, plasticity, and respiration.
What is Skeletal and smooth muscles ?Your whole body weight is made up of 30 to 40 percent skeletal muscles. They are the muscles that attach to your bones and give you the range of motion and abilities. Since skeletal muscles are voluntary, you have control over when and how they contract.
The body contains smooth muscle, which performs a number of different tasks. It aids in digestion and nutrient absorption in the stomach and intestines. It is present throughout the urinary system, where it aids in maintaining electrolyte balance and detoxifying the body of pollutants.Learn more about Skeletal muscles here:
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What is the characteristic of phospholipids that allows them to form double-layered membranes spontaneously?
The characteristic of phospholipids that allows them to form double-layered membranes spontaneously is due to hydrophobic nature provided by the fatty acids and hydrophilic nature provided by the phosphate heads.
the phospholipids present in the cell membrane consist of glycerol backbone which is esterified to fatty acids, a phosphate group and a hydrophilic residue.
Whenever the phosopholipids comes in contact of aquatic environment the the phosphate group that is hydrophilic will come into contact with the water molecules while the hydrophobic part which consist of fatty acids come towards each other.
Hence they align in two layers with hydrophilic phosphate pointing outside and hydrophobic fatty tail pointing inside.
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In words, describe how the data differ between the unlimited water and no-water conditions for the following:
(d) Urea concentration in blood
When there is limitless water availability compared to no water scenario, the urea concentration in blood is lower.
What is Homeostasis?Biology's definition of homeostasis is the capacity or propensity of a body or cell to seek for and maintain an equilibrium state, or a stable internal environment, while adjusting to changes in the environment. In order to maintain a constant internal environment, it uses feedback controls and other regulatory processes. It can be seen as a live organism's ability to maintain itself within the ideal range despite changing external factors.
Describe the differences in the data for the following between the situations of unlimited water and no water in words about blood urea concentration?Homeostasis refers to the body's capacity to maintain general functionality by fending off changes that cause a reaction and restore the system to a steady, ongoing state of optimal functioning.
Controlling body temperature, maintaining proper blood pressure, and regulating water levels are a few instances of homeostasis.
When there is infinite water available, the blood's urea concentration is lower; when there is no water available, it is higher.
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Why do so many substances dissolve in water?
O It can completely surround individual molecules.
O It's a polar substance with positive and negative charges.
O It contains enzymes that break down other substances.
O Water molecules readily bond to other substances.
Answer:
Its a polar substance with positive and negative charges.
Explanation:
Because of its polarity and ability to form hydrogen bonds.
The sickle-cell allele most likely originated when a mutation occurred in a normal hemoglobin allele. If the trait arose in africa, where did it most likely originate?.
The mutation for sickle cell allele most likely originated in Congo (near Kinshasa).
Mutation refers to the change in nucleotide sequence of DNA during cell division in an organism. It can be beneficial or harmful for a population. Mutations for sickle cell allele were originated in Congo by altering a normal haemoglobin allele.
The mutation for the sickle cell allele originated in Congo near Kinshasa and provided a better chance of survival to heterozygous individuals for this allele. As this mutant allele was transferred to the next generations, it allowed them to survive and reproduce with better success and spread the mutation among the populations through migration.
This can be considered an example of natural selection where heterozygous individuals for sickle cell alleles had better chances of survival and reproduction. The heterozygous individuals with sickle cell allele exhibit resistance to malaria. When such individuals get affected by the malarial parasite, their RBCs tend to turn sickle and defend against malaria.
The sickle-cell allele most likely originated when a mutation occurred in a normal hemoglobin allele. If the trait arose in Africa, it most likely originated in Congo.
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Suppose a gastrovascular cavity were open at two ends, with fluid entering one end and leaving the other. How would this affect the cavity's functions in gas exchange and digestion?
Although a continuous, one-way flow of fluid may increase gas exchange, there would likely be insufficient time for food digestion and nutrient absorption if fluid ran through the cavity in this manner.
What exactly is a gastrovascular cavity and what do they do?Primal animal phyla have a feature called the gastrovascular cavity. Both food digestion and the distribution of nutrients throughout the body are its responsibilities. There is only one environmental entrance in the hollow. It is a two-way digestive tract since food enters via the same hole as waste is expelled.
A system of canals may be significantly branching out of the cavity. Since food enters and waste departs through the same orifice, the gastrovascular system in cnidarians is also known as the coelenteron and is sometimes referred to as a "blind gut" or "blind sac."
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Diisopropylfluorophosphate (difp, another name for diisopropylphosphofluoridate, dipf) inactivates chymotrypsin by covalently modifying serine-195. this occurs because?
Diisopropylfluorophosphate (DIFP, another name for diisopropylphosphofluoridate, DIPF) inactivates chymotrypsin by covalently modifying serine-195. This occurs because: serine-195 is in an environment which gives it a higher than normal reactivity with respect to DIPF.
DIPF is a colorless liquid with oil like texture that is widely used as a drug. It is used as a miotic agent to treat diseases like chronic glaucoma and in neuroscience. It has anti-cholinesterase activity. Besides, the chemical is also used in formation of pesticides.
Chymotrypsin is a pancreatic enzyme released from the pancreas. It acts in the duodenum of the small intestine. The enzyme is proteolytic, involved in the breakdown of proteins.
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When scientists were trying to determine the molecule that can transform non-virulent bacteria into virulent bacteria, they found that a cell extract treated with rnase could still transform the cells. Why was this?.
Answer:
This question seems to be a little confusing but we can say.
Explanation:
Only the RNas-treated extracts using heat-killed cells are incapable of turning nonvirulent bacteria towards virulent ones.
Scientists conducted an experiment to discover Griffith's "transforming principle," which describes how transformation is indeed a method of recombining, transmitting, or even transferring genetic information across organisms either from one species to the next. They did this by using heat-inactivated cells & purifying their transforming factor.
As in experiments conducted by the scientists, the pure cells did not provide favorable outcomes, but they did show transformants that were quite close to DNA. A scientist Avery, meanwhile, had his doubts that the outcome must be revised because the molecule did not contain DNA. This happens due to the transforming principle being unaffected by RNA degrading enzymes, whereas the only one cell extracts that can prevent the transformation of non-virulent bacteria onto virulent bacteria are those that have been treated with RNas.
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Compare the composition, structure, and function of starch and cellulose. What role do starch and cellulose play in the human body?
What is the population growth rate from 1850 to 1970?
Telomerase activity is most likely to be found in which cells in humans? red blood cells muscle cells neurons germ line any type of somatic cell
Telomerase activity is most likely to be found in which cells in humans in germ cells.
In humans, telomerase activity refers to the life stages of a man's body.
The role of telomerase is really crucial in humans as it plays a key role in the growth of tumors and the immortalization of cells.
During the development phase, the activity is highly regulated and controlled.
Moreover, it also provides stability to the genome cells in highly immortal and tumor cells by maintaining the uprightness of the chromosomes.
It also plays a very critical role in aging and cell fate.
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