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Related Questions
Which of these is a difference between DNA and RNA?
DNA is found in the nucleus; RNA is never found in the nucleus.
DNA consists of five different nucleotides; RNA consists of four different nucleotides.
RNA is double-stranded; DNA is single-stranded.
DNA contains thymine; RNA contains uracil.
In DNA, adenine pairs with guanine; in RNA, adenine pairs with thymine.
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Like DNA, RNA is made up of nucleotides. There are two differences that distinguish DNA from RNA: (a) RNA contains the sugar ribose, while DNA contains the slightly different sugar deoxyribose (a type of ribose that lacks one oxygen atom), and (b) RNA has the nucleobase uracil while DNA contains thymine.
Jim observes that his pet lizard is more active on warm, sunny days than at night or during rainy days.
Which statement is the most valid hypothesis he can make from this observation?
Lizards are more active when they feel more comfortable.
Lizards like warm temperatures.
O If the temperature increases, then lizards become more active.
If the lizard is active, then the temperature must be cool.
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Answer:
If the temperature increases, then lizards become more active.
Explanation:
The changes that occurred in Yellowstone National Park after all of its wolves
were killed showed that wolves are
A. harmful to the ecosystem
B. the only producers in the ecosystem
C. beneficial to the ecosystem
a
D. unnecessary for the survival of other species
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Which is the most likely outcome for a species of fish that lacks the genetic variation necessary to adapt to a changing ocean environment?
A. Become extinct over time
B. Begin to reproduce asexually
C. Develop mutated cells
D. Develop a resistance to disease
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A. to become extinct over time
as wind movsces over ocean water it produces both currents and _____________ that erode the coastline
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Answer:
as wind movsces over ocean water it produces both currents and _____________ that erode the coastline
Explanation:
sorry
When both lactose and glucose are available to E. coli, which part of the lac operon regulation assures that glucose will be metabolized first? When both lactose and glucose are available to E. coli, which part of the lac operon regulation assures that glucose will be metabolized first? Permease allows lactose to enter the cell when lactose enters the cell. The repressor binds to the operator in the absence of lactose. The repressor cannot bind to the operator in the presence of lactose. RNA polymerase transcribes the lac operon to make a single RNA molecule. CAP binds to cAMP and then to the promoter only in the presence of low glucose.
Answers
Answer:
CAP binds to cAMP and then to the promoter only in the absence of low glucose
Explanation:
When both lactose and glucose are available to E. coli, the part of the lac operon regulation that assures that glucose will be metabolized first is
CAP binds to cAMP and then to the promoter only in the absence of low glucose
Lactose is a type of sugar that is found naturally in milk produced by mammals and Glucose is a monosaccharide made mostly by plants during photosynthesis
For the voltage-gated sodium channel to allow sodium into the cell:_______.
a. the activation and inactivation gates must both be open
b. only the activation gate must be open
c. only the inactivation gate must be open
d. the inactivation gate must be closed shortly before the activation gate opens
e. the activation and inactivation gates must both be closed
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Answer:
The correct option is - (a) the activation and inactivation gates must both be open.
Explanation:
Option (a) is correct because of the following reason -
The axonal membrane is at its natural resting potential until an action potential occurs, and [tex]Na^+[/tex] channels are deactivated and blocked on the extracellular side by their activation gates. The activation gates open in response to an electric current, allowing positively charged [tex]Na^+[/tex] ions to flow into the neuron through the channels. When enough [tex]Na^+[/tex] has penetrated the neuron and the membrane potential has reached a certain level, the [tex]Na^+[/tex] channels inactivate themselves by closing their inactivation gates at the height of the action potential. The inactivation gate can be thought of as a "plug" tethered to the intracellular alpha subunit's domains III and IV. When the inactivation gate is closed, the flow of [tex]Na^+[/tex] through the channel is stopped. As a result, both the activation and inactivation gates must be open to enable sodium ions to enter the cell.
Hence , the correct option is (a).
What features of eukaryotes provide additional opportunities for the regulation of gene expression compared to bacteria? Select all that apply. Select all that apply. interaction with external environment transcription and translation are coupled processes separated processes of transcription and translation presence of chromatin opportunity for posttranscriptional and pre-translational regulation activation of all genes in genome
Answers
Answer:
separated processes of transcription and translation presence of chromatin opportunity for posttranscriptional and pre-translational regulationExplanation:
Since there is no nucleus surrounding the genetic material in prokaryote cells, the transcription and translation processes occur simultaneously. Transcription stops when a protein is not necessary. So the control of protein synthesis is regulated by transcription and not translation. Once the transcription is on, all the following steps must follow it.
Transcription is the process that controls the genic expression in bacteria.
Eukaryotes do possess a nuclear membrane that separates the genetic material from the rest of the cell. The transcription process occurs inside the nucleus membrane, while the translation process occurs outside. In the cytoplasm occur the translation process and protein synthesis. Genic regulation can happen in any of these processes in different regions of the cells.
In eukaryotes, the regulation of the genic expression control might happen at different levels:
Epigenetic level: When DNA molecules open and nucleosomes separate to join the transcriptional factorsTranscription level: When the messenger RNA is being transcriptedPost-transcription level: When mRNA goes to the cytoplasm Translation level: During the protein elongationPost-translation level: Once the protein synthesis is over.please hurryyyyy!!!!!
These traits are found on chromosome #23 and specifically on the X chromosome
a. sex influenced traits
b. linked traits
c. sex linked traits
d. multiple alleles
Answers
Answer:
C. Sex linked traits.
Explanation:
It explains more on https://www.sciencedirect.com/topics/neuroscience/x-chromosome.
what is the name of the hormone that promotes the production of follicles in the ovary?
A-ADH
B-FSH
C-LH
D-TSH
Answers
B-FSH he hormone responsible for starting follicle development and causing the level of estrogen to rise.
Answer:
B
Explanation:
FSH helps mature the follicles, and LH helps stop the phase of ovulation so that next step can occur
Select the statement(s) that is accurate about the immune system.
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A consistent response in many organisms to changing environmental temperatures is the restructuring of cellular membranes.In some fish, phosphatidylethanolamine (PE) in the liver microsomal lipid membrane contains predominantly docosahexaenoic acid, 22:6 at C-2 of the glycerol-3-phosphate backbone and then either a saturated or monounsaturated fatty acyl group at C-1. Which of the following statements are False?
a. At 10 degrees Centigrade a lower percentage of PE molecules contain saturated fatty acyl groups at C-1 when compared to fish acclimatized at 30 degrees Centigrade.
b. At 10 degrees Centigrade a higher percentage of PE molecules contain saturated fatty acyl groups at C-1 when compared to fish acclimatized at 30 degrees Centigrade.
Ñ. At 30 degrees Centigrade a lower percentage of PE molecules had monounsaturated acyl groups at C-1 compared to that observed at 10 degrees Centigrade.
d. At 30 degrees Centigrade a higher percentage of PE molecules had monounsaturated acyl groups at C-1 compared to that observed at 10 degrees Centigrade.
e. The purpose of membrane restructuring with a change in temperature is to maintain fluidity of the membrane.
Answers
Answer:
The false statements are :
b. At 10 degrees Centigrade a higher percentage of PE molecules contain saturated fatty acyl groups at C-1 when compared to fish acclimatized at 30 degrees Centigrade.
d. At 30 degrees Centigrade a higher percentage of PE molecules had monounsaturated acyl groups at C-1 compared to that observed at 10 degrees Centigrade.
Explanation:
The false statements are :
b. At 10 degrees Centigrade a higher percentage of PE molecules contain saturated fatty acyl groups at C-1 when compared to fish acclimatized at 30 degrees Centigrade.
d. At 30 degrees Centigrade a higher percentage of PE molecules had monounsaturated acyl groups at C-1 compared to that observed at 10 degrees Centigrade.
Reason -
When temperature decreases, the proportion of unsaturated fatty acids increases and saturated fatty acids decreases that also decreases the fluidity of the membrane and thereby make it stiff.
When temperature increases, the proportion of unsaturated fatty acids decreases and saturated fatty acids increases that makes the cell membrane more fluidic.
So, the temperature changes restructures the membrane with respect to fluidity of membrane.
Therefore,
At 10° Celsius, at C-1 of glycerol, the proportion of unsaturated fatty acids increases and saturated fatty acids decreases.
At 30° Celsius, the proportion of unsaturated fatty acid decreases and saturated fatty acid increases.
In general, do organisms that have more traits in common also share more genes?
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Answer:
In general, organisms that share similar physical features and genomes tend to be more closely related than those that do not. Such features that overlap both morphologically (in form) and genetically are referred to as homologous structures; they stem from developmental similarities that are based on evolution.
Explanation:
hope it helps!
GIVING BRAINLIEST!!
What were three different biomes that Darwin visited on his voyage.
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Answer:
Tropical rain forest, temperate woodlands, temperate forest.
Explanation:
Charles Darwin collected plants and animal specimens for the study of their distinct pattern of biodiversity. Darwin visited three biomes namely temperate forest, tropical rainforest, and temperate grassland.
What are biomes?
A biome is a biogeographical unit which is consist of a biological community formed in response to a shared regional climate.
Biomes may be spread over more than one continent. Biome is a term for habitat which can be comprised of a variety of habitats.
During the voyage, Darwin visited three biomes namely temperate forest, tropical rainforest, and temperate grassland for the study of biodiversity of plants and animals.
Thus, it can be concluded that temperate forests, tropical rainforest, and temperate grassland are the three different biomes that Darwin visited on his voyage.
For more details regarding biomes, visit:
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Why did the rabbit with medium size legs
survive?
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Answer:
it was the fittest......
Answer:
cause it didnt have skinny legs that was twiggs ;)
based on the information on the map where are the most stable ecosystems usually found?
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The correct answer is C. Near the equator.
Explanation
The image shows a world map in which there is a horizontal black line in the middle that represents the equator line and some red areas. These areas are the most stable ecosystems in the world since due to their proximity to the equator the incidence of the sun's rays is more direct. Also, in these areas, there is no weather pattern defined by seasons, but climates are defined by altitude, that is, meters above sea level. Therefore, the correct answer is C. Near the equator.
Answer: c
Explanation:
I took the test :)
Food is useful to organisms because it contains ? Radiant energy, thermal energy, motion energy, chemical energy
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Answer:
Chemical energy
Explanation:
Because food passes through chemical reactions. eg. digestion of food is a chemical reaction
HELPPPPPPPP!!!! what is a mutation that a polar bear can have to help conserve energy and how do genetic mutations relate to chromosomes, genes, protein, and DNA?
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Answer:
wings
Explanation:
Diabetes is a disorder of which body part? O the adrenal gland the thyroid the pancreas the liver
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Answer:
The pancreas
Explanation:
it happens when the pancreas doesnt produce enough of something called insulin
Match the body cavity type to its proper description. - Coelomate - Pseudocoelomate - Acoelomate - Coelom A. A fluid or air-filled space between the digestive tract and the outer body wall. B. Completely lacks a body cavity between the digestive cavity and outer body wall. C. Has a body cavity lined by tissue derived from the mesoderm and by tissue derived from the endoderm. D. Has a body cavity completely lined by tissue from the mesoderm. E. Germ Layer
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Answer: A. A fluid or air-filled space between the digestive tract and the outer body wall. - Coelom
B. Completely lacks a body cavity between the digestive cavity and outer body wall. - Acoelomate
C. Has a body cavity lined by tissue derived from the mesoderm and by tissue derived from the endoderm. - Coelomate
D. Has a body cavity completely lined by tissue from the mesoderm. - Pseudocoelomate
E. Germ Layer- Coelomate
Explanation:
Coelom is a fluid filled body cavity which stores food, blood like fluid in it in some animals.
Those organisms which do not possess the body cavity or coelom they are called as acoelomate. Example, Platyhelminths
Those animals which have a body cavity derive from the germinal layers ectoderm, endoderm, and mesoderm are coelomate. Example, Annelids
Those animals which have scattered pouches which are not lined by all germinal layers instead one mesoderm will not be able to form coelom. These are called as pseudocoelomate. For example, Nematodes.
PLEASE HELP !! ILL GIVE BRAINLIEST *EXTRA 40 POINTS* DONT SKIP :(( .!
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Answer: d
Explanation:
They are compe for the same prey which means this is a survival competition
1. What do you understand by the resolution or resolving power of a lens?
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Answer:
The resolving power of an objective lens is measured by its ability to differentiate two lines or points in an object. The greater the resolving power, the smaller the minimum distance between two lines or points that can still be distinguished. The larger the N.A., the higher the resolving power.
Explanation:
Help ASAP, please
Thank you, Friends:)
Answers
The largest endocrine gland (s) that makes 3 hormones that affect the metabolism is the: *
A. pituitary gland
B. thyroid gland
C. pancreas
D. adrenal gland
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Answer:
The largest endocrine gland (s) that makes 3 hormones that affect the metabolism is the: thyroid gland.
The largest endocrine gland that makes three hormones that affect metabolism is the Pancreas. Thus, the correct option for this question is C.
What do you mean by Endocrine Gland?An endocrine gland may be defined as a type of gland which consists of several organs that make hormones and release them directly into the blood so they can travel to tissues and organs all over the body. These hormones control many important functions in the body, including growth and development, metabolism, and reproduction.
The pancreas is the largest endocrine gland that significantly makes three hormones namely, Insulin, Glucagon, and Somatostatin. These hormones are actively involved in the regulation of metabolism by numerous mechanisms.
For example, insulin lowers the level of sugar in the blood, while glucagon increases the level of sugar by transforming its storage form.
Therefore, the largest endocrine gland that makes three hormones that affect metabolism is the Pancreas. Thus, the correct option for this question is C.
To learn more about Endocrine glands, refer to the link:
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1000000000000000000-100000000000000000000
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Answer:
-00.................
Answer: ITS OVER 9000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
Explanation:
Describe asexual reproduction.
A. It is when a new organism forms from a piece of the original
B. It is when a new animal grows out from the parent until it fully matures and breaks off
C. It is a reproductive process that involves only one parent and produces offspring that are genetically identical to the parent
D. It is a reproductive process that involves two parents combine their genetic material to produce a new organism which differs from both parents
Answers
Answer:
c
Explanation:
Answer:
C hope this help
Explanation:
The microscope best for viewing living cells at low levels of magnification is the
electron microscope.
True
False
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Answer:
the answer is true I hope it helps
Many scientists say that there is a good reason for gaps in the fossil record. Can you explain why some extinct animals and plants were never fossilized?
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Answer:
For an organism to become a fossil, it must not decompose or be eaten. This can happen if the organism either lives within or is moved to a place where it can be buried and kept from decaying. When an organism is buried quickly, there is less decay and the better the chance for it to be preserved.
Explanation:
I copied and pasted from https://www.americangeosciences.org/education/k5geosource/activities/investigations/fossils/how-fossils-form ,it might help for your work.
Identify the true statements regarding liver glycogen phosphorylase a. Protein phosphatase 1 is abbreviated PP1. The binding of glucose to liver phosphorylase a shifts the equilibrium from the active form to the inactive form. Liver phosphorylase a concentration decreases when glucose enters the blood. As the concentration of phosphorylase a decreases, the activity of glycogen synthase increases. Liver phosphorylase a is regulated by AMP, adenosine monophosphate. When PP1 is bound to phosphorylase a, both PP1 and phosphorylase a are active.
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Answer:
Liver phosphorylase a concentration decreases when glucose enters the blood.
The binding of glucose to liver phosphorylase a shifts the equilibrium from the active form
As the concentration of phosphorylase a decreases, the activity of glycogen synthase increases. to the inactive form
Explanation:
Protein phosphatase 1 (PP1) is a phosphatase enzyme known to remove phosphate groups from serine/threonine amino acid residues. PP1 plays diverse biological roles including, among others, cell progression, control of glucose metabolism, muscle contraction, etc. In glucose metabolism, PP1 regulates diverse glycogen metabolizing enzymes (e.g., glycogen synthase, glycogen phosphorylase, etc). In the liver, glycogen phosphorylase catalyzes the rate-limiting step in glycogenolysis by releasing glucose-1-phosphate. Glycogen phosphorylase a is converted (and inactivated) into the b form by PP1, which catalyzes the hydrolysis of the phosphate bond between serine and the phosphoryl group. In the liver, glucose binds in order to inhibit glycogen phosphorylase a, thereby inducing the dissociation and activation of PP1 from glycogen phosphorylase a.
The purpose of mitosis is to ___, while the purpose of meiosis is to ____.
a) make new cells, and only germ-line cells do it;
b) make eggs or sperm, and all the body cells do it make eggs or sperm, and only germ-line cells do it;
c) make new cells, and all body cells do it make eggs or sperm, and only somatic cells do it;
d) make new cells, and all body cells do it make new cells, and all body cells do it;
e) make eggs or sperm, and only germ-line cells do it
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Answer:
A) make new cells(somatic cells)and only germ-line cells do it(meiosis)
Explanation:
Meiosis is the process through which germ cells that produce gametes such as sperm and eggs are formed. It is an equatorial division that involves the parental cell dividing into daughter cells each containing similar genetic material as the parents cell and this can be passed on to successive generation.
While Somatic cells are cells that form the building blocks of the body, they are the actively divided body part and only divide by mitosis.
Meiosis produces germ cells while mitosis produces somatic cells.