Answer:
The correct answer is - all cells arise from pre-existing cells.
Explanation:
Robert Virchow observed during the cell division in half that a single cell divide into two new cells therefore he suggested that, a famous aphorism Omnis cellula e cellula which means all cells arise from pre-existing cells. His observation is one of the major points of the cell theory.
This observation made by Robert Virchow becomes the fundamental basis of the cell theory which describes that cell divides to produce new cells. The other greatest observation made by him was that all cells not get sick or affected but a group of cells only.
Akshay decides one day to run a marathon without any training. After 10 minutes your lapsed and akashay, has run half a mile, he begins to get cramps in his thigh he's also breathing very rapidly what is causing the cramps on his legs?
Answer:
Lactic acid accumulation in the leg muscles
Explanation:
Muscle cramps are painful feelings caused by sudden contractions of the muscle. Cramps are caused by several reasons, however, based on the description of Akashay's activity, it is caused by ACCUMULATION OF LACTIC ACID in the leg muscles due to strenuous exercise.
According to this question, Akashay decided to run a marathon without any prior training. However, he started to get cramps on his thigh coupled with rapid breathing. There is a lack of oxygen in his cells, hence, anaerobic respiration was used leading to the formation of lactic acid. The buildup of lactic acid is what causes the painful sensation called CRAMP.
Bromine is a liquid at room temperature. The volume of a sample of bromine is measured in a 50 ml beaker and a 100 ml beaker. How will the two
measurements compare?
A. The volume of bromine will be larger in the 100ml beaker.
B. The volume of bromine will be smaller in the 50ml beaker,
C. The volumes will be the same.
D. Both A and B
The actual volume of bromine in each beaker will be same only the difference in height will be comparable. Therefore, option (C) is correct.
What are the properties of liquid ?A liquid's attributes are;
1) Compared to the volume occupied by a gas, the volume of a liquid is relatively stable at conditions that allow it to remain in the liquid state.
2) A liquid will take the form of the container it is placed in.
3) A liquid's surface in a container must be flat for the attraction forces between its molecules to be in equilibrium both at the liquid's surface and within its body.
Therefore, there will be variations in the measured height of the same volume of bromine in each beaker given that the volume of the bromine is measured in a 50 ml beaker and a 100 ml beaker.
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Why can smaller cells diffuse oxygen and nutrients at a faster rate?
small surface area to volume ratio
large surface area to volume ratio
large surface area
more volume than surface area
Answer:
A further increase in the size of a cell could result in a surface area too small for adequate exchange of materials.: A large surface to volume ratio means that a small amount of living matter has a large surface through which nutrients, oxygen and wastes can diffuse.
definition of biotechnology
Answer:
definition
Explanation:
the exploitation of biological processes for industrial and other purposes, especially the genetic manipulation of microorganisms for the production of antibiotics, hormones, etc.
As a frog develops from a tadpole into an adult frog, it goes through changes that are signaled by hormones within the body. Which best describes the role hormones play in changing a tadpole to a frog?
Answer: In amphibians, metamorphosis is generally associated with the changes that prepare an aquatic organism for a primarily terrestrial existence In (frogs and toads), the metamorphic changes are more dramatic, and almost every organ is subject to modification Regressive changes include the loss of the tadpole's teeth and internal gills, as well as the destruction of the tail. At the same time, constructive processes such as limb development are also evident. The means of locomotion changes as the paddle tail recedes while the hind limbs and forelimbs develop. The tadpole's cartilaginous skull is replaced by the predominantly bony skull of the frog. The teeth used for tearing pond plants disappear as the mouth and jaw take a new shape, and the tongue muscle develops. Meanwhile, the large intestine characteristic of herbivores shortens to suit the more carnivorous diet of the adult frog. The gills regress, and the gill arches degenerate. The lungs enlarge, and muscles and cartilage develop for pumping air in and out of the lungs. The sensory apparatus changes, too, as the lateral line system of the tadpole degenerates, and the eye and ear undergo further differentiation The middle ear develops, as does the tympanic membrane characteristic of frog and toad outer ears. In the eye, both ingratiating membranes and eyelids emerge.
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How does genetic variation allow humans to survive long-term?
Which type of reproduction is responsible for genetic variation?
Answer:
Because natural selection acts directly only on phenotypes, more genetic variation within a population usually enables more phenotypic variation. Some new alleles increase an organism's ability to survive and reproduce, which then ensures the survival of the allele in the population. Sexual reproduction promotes genetic variation by producing different gene combinations. Meiosis is the process by which sex cells or gametes are created. Genetic variation occurs as alleles in gametes are separated and randomly united upon fertilization.
In "gastrulation" cells begin to differentiate. They form different types of tissues so they can accomplish different purposes in the body.
True or False?
Answer:
The statement that says that In "gastrulation" cells begin to differentiate and they form different types of tissues so that they can accomplish different purposes in the body, is true.
Explanation:
Gastrulation involves a process of cell division, migration and differentiation, being one of the stages of embryonic development.
Cell differentiation and migration in gastrulation leads to the formation of germ layers, which are responsible for forming different tissues and fulfilling different functions in the body:
The outermost lamina is called the ectoderm, which can give rise to nerve tissue and part of the skin tissue. The mesoderm is the middle lamina, and from it vascular, bone, muscle, and joint tissue can develop, as well as tissues of excretory and reproductive organs. Endoderm corresponds to the internal lamina, forming in great part the mucous membrane of the organs of the digestive system.It is true, then, that In gastrulation cells begin to differentiate and form different types of tissues so they can accomplish different purposes in the body.
In the laboratory, yeast cells are usually grown at a temperature of 25oC. A scientist wanted to determine if yeast cells would reproduce faster or slower when the temperature was dropped to 15oC. The same number of yeast cells were placed in the same medium with the same amount of nutrients. One sample was kept at 25oC and the other one was kept at 15oC. The number of yeast cells was counted every hour for an eighteen hour period.
Answer:
This question is incomplete, however, it is asking to identify the following variables:
Independent variable: Temperature
Dependent variable: Number of yeast cells
Constants: same amount of nutrients, same number of yeast cells, same medium
Explanation:
- Independent variable is the variable that the experimenter changes or manipulates in order to bring about a measurable effect. In this experiment, the TEMPERATURE at which the yeast are kept is the independent variable.
- Dependent variable is the variable that responds to the changes made to the independent variable. It is the variable that is measured by the experimenter in the experiment. In this case, The NUMBER OF YEAST CELLS was counted, hence, it is the dependent variable.
- Constants are variables that are kept unchanged or same for all groups by the experimenter in order not to influence the experiment's outcome. In this case, the CONSTANTS are: same amount of nutrients, same number of yeast cells, same medium etc.
A cell must expend energy to accomplish substances movement during A osmosis B active transport C passive transport D diffusion E filtration
I NEED HELP IN ENVIRONMENTAL SCIENCE PLEASE
Cindy/was diagnosed with anemia recently, because her physician found that her blood contains a lower count of red blood cells than normal. 4 A) What is anemia's immediate impact on gas exchange?
Answer:
The correct answer would be - a decrease in the numbers of RBCs will lead to a decrease in the ability for gas exchange in a person.
Explanation:
In the case of anemia, there would be a decrease in the number of RBCs that might be due to increased destruction of these cells, or low production of RBCs, that transporting oxygen and carbon dioxide affects the ability for gas exchange in an individual.
RBCs carry and transport oxygen to various body parts and then carry back carbon dioxide from different parts of the body to the lungs for gaseous exchange but with less number of RBCs leads to impair or decreased gas exchange in the case of anemia.
In glycolysis, for each molecule of glucose that is broken down into pyruvate?
2 molecules of ATP are used, and 4 molecules of ATP are produced
2 molecules of ATP are used, and 2 molecules of ATP are produced
4 molecules of ATP are used, and 2 molecules of ATP are produced
2 molecules of ATP are used, and 6 molecules of ATP are produced
Answer:
2 molecules of ATP are used, and 4 molecules of ATP are produced
Explanation:
which molecules are not able to permeate the cell membrane
Answer:
Small uncharged polar molecules, such as H2O, also can diffuse through membranes, but larger uncharged polar molecules, such as glucose, cannot. Charged molecules, such as ions, are unable to diffuse through a phospholipid bilayer regardless of size; even H+ ions cannot cross a lipid bilayer by free diffusion.
Explanation:
1) In pea plants, purple flowers are dominant to white flowers. If two white flowered plants are crossed,
what percentage of the plants will be purple?
Explain your reasoning using a punnett square and a short written explanation.
Answer:
all white
If students are stuck on this one, advise them to make a "key" to help them sort it out.
PP = purple, Pp = purple, pp = white
Explanation:
Choose THREE human activities that have a negative impact on the
biodiversity within Amazon rainforests.
A
captive breeding of organisms
B
change in the land-use pattern
С
exploitation of available resources
D
Introduction of conservative measures
E
introduction of invasive species
restoration of degraded land
Answer:
The 3 would be the following:
A
captive breeding of organisms
E
introduction of invasive species
restoration of degraded land
4. Which of the following would be the best control sample for the study?
A)
A sample of water collected just downstream of the southern forest
(B) A sample of water collected just downstream of the housing development
C)A sample of water collected just downstream of the northern forest
D)A sample of distilled water
Answer:
D. A sample of distilled water
Explanation:
You need to have a control sample that hasn't been messed with to see what would happen if you had no reaction to your experiment
A sample is the smaller set of data which a researcher makes use of to complete a research.
As a result of this, we can see that a sample study is the use of these samples to come to a conclusion about the investigation or research which is going on.
Some examples of a sample study include:
Simple random sampling. Systematic sampling. Stratified sampling, etcPlease note that your question is incomplete so i gave you a general overview which would help you get a better understanding of the topic.
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3. Which tool do scientists use to classify plants that is based
on a series of paired characteristics?
observation power
dichotomous key
sketch book
plant classification
what does a Cell membrane look like
The cell membrane is not a solid structure. It is made of millions of smaller molecules that create a flexible and porous container.
Explanation:
Classify photosynthesis and cellular respiration as endergonic or exergonic. Explain how you know.
Explanation:
photosynthesis is an endergonic process as it involves the absorbtion of energy (in the form of sunlight), while cellular respiration is an exergonic process as it involves the release of energy in the form of ATP molecules-the energy currency of the cell.
What does atomic number tell you about an atom? * Number of electrons in the nucleus Number of protons and neutrons in the nucleus Number of protons in the nucleus Number of electrons in the electron cloud around the nucleus *NEED ANSWER QUICKLY*
Answer:
Number of protons in the nucleus
Answer:
Number of protons in the nucleus
Explanation:
group the items according to the type of respiration they describe (picture included)
Answer:
Aerobic: Processes Oxygen, Carbon Dioxide by-product
Anaerobic: Processes Carbon Dioxide, Fermentation
Both: Produces ATP, Takes place in cells
Explanation:
Aerobic Process: Oxygen, Carbon Dioxide by-product
Anaerobic Process: Carbon Dioxide, Fermentation
Both: Produces ATP, Takes place in cells
What is respiration ?Respiration is a metabolic process in which an organism's living cells use oxygen to obtain energy (in the form of ATP) and release carbon dioxide as a byproduct of the oxidation of complex organic substances.
Anaerobic respiration occurs when there is no oxygen present, whereas aerobic respiration occurs when there is oxygen. Alcohol is produced by anaerobic respiration, whereas carbon dioxide and water are the byproducts of aerobic respiration. Compared to anaerobic respiration, aerobic respiration produces more energy.
Thus, respiration is a vital process of the body.
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Urea diffused in all regions of the filter during countercurrent flow. Using what you know about the sizes of urea and potassium, which graph shows what would happen to potassium during countercurrent flow?
Answer:Diffuse in all regions of the filter
Explanation:The potassium level in dialysis is often lower than usual because of incomplete equilibration
What is the difference between droplet and airborne spread of viruses like the measles?
Answer:
droplet consists of exposure to larger, smaller and particles when a person is close to a infected person. airborne consist of smaller droplets even for greater distance
1. What are the four levels of organization in our bodies, from smallest to largest?
(smallest)
>
(largest)
Answer:
Cells
<
Tissues
<
Organs
<
Organ system
Answer:
cell, tissue,organ, system,these are the four level of organization in our body,from smallest to largest
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Explain why the sun appears to be the brightest star in the sky. Relate your explanation with an example, such as streetlights
Answer:
when you look a streetlight from far it will be some how not bright. the other stars are far from planet earth . but the sun is near
Explanation:
Please help It is making me cry
Answer:
What are you supossed to be doing
Explanation:
Answer:
Can you give me the answers?
Explanation:
A dog breeder is looking into purchasing a 3 year old male dog for her business. A breeder online is advertising purebred males for $700. What would you suggest the breeder do before she purchases this dog?
Answer:
The dog breeder to check for all the details that meets her requirement of dogs.
Explanation:
A dog breeding is the practice of mating dogs. In the context, it is given that a dog breeder wants to purchase a male dog of three year old for her business and she founds an advertisement on the net about a purebred males that costs $700. Now before buying this purebred male dog, the dog breeder should first of all check whether the seller who is selling online is a licence breeder or not.
The dog breeder should also check whether the dog is a purebred or not and should also find out the actual age of the dog. The health of the dog should be checked by an professional vet before buying the dog.
The selling of dogs, either a hybrid or a purebred costs differently. An individual should check the license and health of the dogs before purchasing.
In the given example, the dog breeder is trying to purchase a three-year male dog. She saw an advertisement that the male dog is available at the rate of dollars 700.
Before purchasing the dog, the breeder should check:
the authenticity of the advertisementrespective seller details and valid contact information the genotype of the dog as claimed purebred, and the health of the dog from a professional veterinarian.
Thus, the breeder should check all the authenticity of the dog and its health.
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What types of sources are reliable?
Answer:
A reliable source is one that provides a thorough, well-reasoned theory, argument, discussion, etc. based on strong evidence. Scholarly, peer-reviewed articles or books -written by researchers for students and researchers. Original research, extensive bibliography.
Explanation:
Hope this helps! Please mark brainiest!
Reliable sources are usually sources that end in .org Im not sure about other sources but the most reliable ones would be the .org However, there are some .com sources that are reliable, Dont use Wikapedia, this website is a place where anyone and everyone can edit what the facts say.
I hope that this helps you out ^-^
Whats the name of this flower?
Answer:African lily
Explanation:
Just searched it
If a cell normally has 16 chromosomes goes through Meiosis, how many
chromosomes will be in each cell at the end?
Answer:
16/2= 8
Explanation: