This tag indicates that the question is likely based on a home assignment in biology-related university or high school courses. Please see the homework policy on meta before asking homework questions.

learn more… | top users | synonyms

2
votes
0answers
53 views

How does the introduction of clones would affect population genetics? [on hold]

Since the ability to clone animals gives another way to preserve species, this could help for the breeding process. It has been noted that with the ability to clone animals, endangered species can ...
0
votes
0answers
14 views

DNA. mRNA, tRNA [on hold]

Can someone explain to me how transcription and translation works, especially the part about codes. And does amino acids has code or is it the tRNA?
0
votes
1answer
37 views

A state model of sodium channels

I am studying by myself Human Physiology. I have encountered the following question: In the following given model of sodium channel with 3 states open closed blocked (which I assume means ...
-1
votes
0answers
14 views

If spore possesses 10 chromosomes with 20 picogram DNA then calculate the amount of DNA in prophase II?

Options : a) 20 b) 10 c) 40 According to me, it should be 20 because a cell in prophase II is haploid after completing meiosis I reduction division. Also, spores are haploid, so amount of DNA should ...
0
votes
0answers
13 views

How is the mitotic rate controlled? [closed]

I think by regulating the temperature and pH but im not sure exactly therefore please can anyone give me a detailed structured answer.
0
votes
0answers
21 views

Southern blot interpretation [closed]

Here is the result of a Southern Blot given to me as part of an exercise: I looked for explanations on several websites, but I could not find the proper information to analyse those results. Here is ...
0
votes
1answer
21 views

Does mechanotransduction of cells play a role in the biocompatibility of titanium?

What exactly is mechanotransduction as the information varies between sources. Some sources indicate that mechanotransduction is the underlying principle where cells pull on the surface they grow on ...
1
vote
2answers
50 views

What animal produces male gametes by mitosis?

The following question came up in my biology examination but I could not answer it: "What animal produces male gametes by mitosis?" I know that some plants produce their gametes by mitosis in ...
5
votes
1answer
98 views

How can I make a protein interaction/protein-complex network?

Let's say I have a list of proteins ID. I would like to know whether I can find any complex based on that list. Any example, explanation is appreciated. An example input is what you see below. What ...
0
votes
1answer
71 views

Techniques to show a protein heterodimer-DNA interaction

It is known that c-Jun and fos dimerize to form AP1 factor that binds to a sequence on DNA containing PyPuGACGTCNNNNGAGGTCPyPU. In esophageal cancer cell lines there is no expression of the fos gene. ...
29
votes
2answers
8k views

Who are humans' closest relatives, after primates?

This question here addresses the controversy of whether humans are more closely related to bonobos or chimps. My question is - which group of animals are are closest relatives, beyond primates? Or ...
1
vote
2answers
40 views

Choice of primers for PCR

This exercise was given by my professor but I am struggling to understand the solution. A PCR is performed on the following sequence (in order to replicate the chain and thus have a greater quantity ...
4
votes
1answer
151 views

How do I make a multiple sequence alignment (MSA)?

I have a DNA sequence that makes protein 1, but now I have asked to: compare the amino acid sequence of protein 1 with nine homologous proteins and make a multialignment of the sequences. Determine ...
5
votes
1answer
50 views

Data on Gene Position in Human Genome

I am trying to get some data on gene position in the human genome and I need some help What I tried I downloaded ...
2
votes
1answer
50 views

How many paraphyletic groups can be formed from a phylogeny?

How many paraphyletic groups can theoretically be created from this phylogeny? I found (2n)-2. Is this correct? This is not homework nor exam, just a question about paraphyletic groups.
-2
votes
1answer
59 views

Based on this diagram, how do you deduce the keystone species? [closed]

How would you figure out what the keystone species is in the following textbook question? (questions 1 and 2 at the bottom of the image) Based on my knowledge, a keystone species helps to maintain ...
1
vote
2answers
140 views

Blebbistatin effect on vesicles

Blebbistatin is a drug that specifically inhibits the assembly of myosin in the cytoskeleton. What effect would you expect blebbistatin to have on intracellular vesicles? ...
0
votes
1answer
47 views

Why all trees have cylindrical stems?

Why a huge number of trees/plants have cylindrical stems? I have been told that this question's answer lies in Physics but I don't know where to find. Can any one help?
1
vote
0answers
23 views

Why is CO2 unable to be catabolized by cell? [closed]

Why is CO2 unable to be catabolized further ? a.The double bond in CO2 is too strong b.CO2 has less bound electron than any other organic compound c.CO2 has been fully reduced d.CO2 has been fully ...
-2
votes
1answer
55 views

What cause the urge to inhale in humans? [closed]

The urge to inhale in humans result from (a) rising pCO2 (b) rising pO2 (c) falling pCO2 (d) falling pO2 p stands for partial pressures. I am guessing the answer is falling pCO2.... but I wanted what ...
1
vote
0answers
29 views

Why do gram-positive bacteria cause respiratory diseases more frequently than gram-negative bacteria? [closed]

My theory is that aerobic respiration by gram positive bacteria thrives in ideal conditions of the lungs therefore creates respiratory diseases?
-2
votes
0answers
43 views

Animal Diversity Character State Matrix

i Need help wit developing a character matrix for all the kingdom animalia. i have spent many days trying to figure this out, but seem to get confused and lost.
1
vote
0answers
20 views

Electrophoretogram of microstallites - DNA profile of children [closed]

This exercise says that Paul and Caroline want to have 2 children. The question is: what is the probability that the 2 children will have the exact same DNA profile at those 4 loci? Then the given ...
-1
votes
2answers
32 views

Are intercellular junctions, synapses and light-capturing photosynthetic complexes mobile? [duplicate]

I was reading Cell Biology by Gerald Karp and came across a section which said- Membrane fluidity makes it possible for clusters of membrane proteins to assemble at particular sites within the ...
3
votes
1answer
60 views

Understanding common identifier codes (IDs) in biology databases

I know this is very basic but I would like to understand it and it's difficult to know where to begin with a new database. I have the output: ...
5
votes
2answers
5k views

How do we know that everybody's DNA fingerprint is unique?

How do we know that everybody's DNA fingerprint is unique? I know, I know, everybody's DNA is unique. But when we do DNA fingerprinting, we're looking at very specific regions of high variability. ...
1
vote
0answers
18 views

Any books/publications about what life was like before antibiotics?

Just wondering. We've been discussing antibiotic resistant bacteria a bit in lecture, and how we're slowly sinking into a pre-antibiotic era again.
3
votes
1answer
72 views

What is the direction of current flow in myelinated nerve cells?

Is it correct to say electric current flows through the extracellular space, or cytosol of a nerve fiber during impulse conduction? I know that an impulse is actually a change of membrane potential ...
3
votes
0answers
33 views

Minichromosome maintenance protein structure and function

I am having difficulty answering three homework questions which relate directly to Chong et al. (2000). Questions The authors have determined that MtMCM is able to bind both ssDNA and dsDNA (see ...
0
votes
0answers
15 views

Trouble identifying a gene given an Expressed sequence tag

I have an assignment where we need to answer several questions about an EST, however, I'm having trouble getting started. My sequence contained a Not I site (clipped that) and no poly A signal. We ...
3
votes
1answer
68 views

spinal cord lesion and result in somatic sensation

Jimbo suffers a lesion to the entire right half of the spinal cord at the T6 level. A few weeks after his injury, his doctor tests his right and left legs for somatic sensation and tone. fill out her ...
3
votes
2answers
97 views

Is numbness the absence of one or all touch sensations?

I am studying the effects of tetrodotoxin and its symptoms when consumed. Numbness is one of the first sensations reported. But I googled numbness and I couldn't find information about whether this ...
1
vote
1answer
63 views

An experiment to test if a bacterial resistance gene is on the plasmid or chromosome?

So I have an E.coli strain phenotypicall resistant to the antibiotics ampicillin and rifampicin. How do I test if the AmpR gene is carried on a plasmid and not on the chromosome? In summary, I ...
1
vote
0answers
39 views

Are there non-essential cell organelles? [closed]

Suppose an eukaryotic animal cell would have to choose to loose an organelle, akin to the voting system of the TV show Big Brother. Which organelle would be the least important to the cell and ...
1
vote
0answers
24 views

How quickly does plant cells regenerate? [closed]

This is a question from my Biology class homework? I've looked online, but I can't find the answer.
2
votes
1answer
79 views

What happens when our muscle tense? [closed]

Is the tensing of muscles equivalent to stretching them? I am trying to understand what tensing of the muscles means.
1
vote
1answer
189 views

Function of carapace

Majority of crustacean larvae have expanded carapace drawn out into processes as an adaptation for : a. Protection from enemies b. Planktonic habit The answer given is b but I think it should be ...
1
vote
0answers
115 views

Construct a restriction map of a linear fragment of DNA using the following data?

I've attempted to do the single digests, and the double digests, but cannot complete the map.... I've attached what I've done so far DNA Sizes of Fragments (bp) uncut DNA 900 DNA cut with EcoRI ...
2
votes
1answer
64 views

Are alpha-ketoglutarate and glutamate involved in all transamination reactions?

Is it true that for all biochemical transamination reactions, that alpha-ketoglutarate and glutamate serve as the amino group acceptor and donor, respectively? If this is true, then is it safe to ...
3
votes
3answers
161 views

Where should I start looking for an online gene library?

Is there an online library that includes all known genes in stored in their nucleotide form of all living organisms? I'm presuming that such a database doesn't exist. So to kick of my search, how ...
1
vote
0answers
54 views

What would happen if there were no protists? [closed]

This is for an inquiry project for my biology 11 class. I need opinions from some professionals so please help out.:) if you dont mind also putting your name and what you do or what degree you that ...
1
vote
0answers
20 views

What is the site on an enzyme that binds either exitatory or inhibitory molecules? [closed]

A site on an enzyme where either exitatory or inhibitory molecules can bind is called a(n): A) electron transport site B) active site C) coenzyme D) metabolic pathway E) allosteric site If you ...
1
vote
4answers
624 views

Punnett Square Help

In fruit flies, red eyes are dominant over white eyes. Show a cross between two white-eye fruit flies. My question is... How do I know if the white-eye fruit flies are homozygous or heterozygous?
6
votes
2answers
272 views

How many ATP are formed?

What is the number of ATP molecules formed during the photosynthetic processes which consume 8 molecules of $\text{H}_2\text{O}$ due to noncyclic electron transport and subsequent ...
0
votes
1answer
55 views

Solving a Pedigree Between Heterozygous Half-Cousins

A man who is a known heterozygous carrier of oculocutaneous albinism marries his half-cousin (they share one common grandparent) as shown in the pedigree below. This trait is transmitted as a fully ...
3
votes
1answer
61 views

Could a single cell be brought to life?

If a scientist is observing a single cell under a microscope, and then realizes that the cell has died, is it possible to bring that dead cell back to life? For my inquiry, let's assume that the ...
1
vote
1answer
94 views

Enzymes and plasmids

A high school class has analyzed plasmids by the help of restriction enzymes and electrophoresis. The class got delivered two different plasmids, pBR 322 and pC 508. These two plasmids were going to ...
0
votes
1answer
101 views

Find how much times blood is filtered in the kidney? [closed]

The blood that circulates in our body is about 1/12 of our mass. If the kidneys filter 7.5 liter of blood a hour, then how many times does it filter in the kidney the whole blood of a person will mass ...
0
votes
1answer
143 views

Can someone help me analyze this article? [closed]

I need to read this article — "Beyond the rainbow" by Marie-Claire Koschowitz et al., for an exam. Following are some questions for which I could not figure the answer out after reading. 1) Why ...
1
vote
0answers
19 views

Comparing genetics [closed]

Compare the possible effect on an individual of knowing that they have genes predisposing them to type-2 diabetes and the dominant allele that causes Huntington's disease. I am not sure about the way ...