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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?
2
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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 ...
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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 ...
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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 ...
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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.
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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
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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 ...
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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 ...
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 ...
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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 ...
0
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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?
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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 ...
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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 ...
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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?
5
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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 ...
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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.
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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 ...
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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 ...
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.
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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 ...
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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
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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
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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. ...
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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 ...
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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 ...
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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 ...
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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.
3
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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 ...
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.
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0answers
114 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 ...
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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
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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 ...
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 ...
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: ...
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
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 ...
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 ...
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 ...
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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 ...
0
votes
1answer
43 views

Which of the following is NOT a type of tropism?

Which of the following plant movements is NOT a tropism? Plant stem growing toward light Plant structure growing away from light Plant roots growing in response to gravity Vines coiling around ...
3
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2answers
335 views

Gene and alleles

This is a multiple choice question: Consider a gene, ABC, which codes for an enzyme involved in the metabolism of sugars. There are two known alleles of this gene, ABC1 and ABC2. Which statement ...
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0answers
52 views

Which of the three is true for insulin receptors?

I have seen the following question in a Cell Biology exam: Which of the following is true" Insulin has an hydrophobic Signal Peptide and the insulin receptor does not have an hydrophobic ...
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0answers
38 views

Relation between heterozygosity and allelic diversity in founder effects/bottleneck?

Can someone try to explain me why allelic diversity falls faster than heterozygosity, reminding you that we're talking about bottleneck or a founder effect? Look at this graphic: It's clear to me ...
6
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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 ...
3
votes
1answer
431 views

Problem: What is this pattern of inheritance?

The following question was on a pretest of mine, and I'm trying to figure out the answer using what we've learned about Mendelian and non-Mendelian patterns of inheritance. I'm struggling quite a lot ...
1
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0answers
33 views

Location of CD8 receptor [closed]

I have a multiple choice question that says The CD8 receptor is found on: Ts cells Tc cells Both of them I think it is both of them but I found the answer is Ts cells Could someone explain ...
4
votes
1answer
548 views

Pedigree Analysis: Problem

I'm struggling to arrive at the answer to the following question, which appeared on a pre-test of mine and which I am now using to study the material we've learned. According to this helpful video, I ...
4
votes
1answer
51 views

Determine which seed will germinate first

I recently studied about plant physiology for a test. Strangely, there was this question which I had no idea how to approach. The question is, Which seed will germinate first? a) Castor b) Wheat ...
1
vote
1answer
28 views

A question involving immunoprecipitation to identify interacting proteins?

Using recombinant Flag-tagged Dcr-2 and His-tagged protein X, pull-down assays were performed to determine whether protein X and Dcr-2 interact directly. The recombinant proteins (either alone or in ...
1
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0answers
11 views

Which fractions are enriched for siRNA cleavage activity by comparing electrophoresis?

Size exclusion column chromatography was used to separate the proteins in a Drosophila cell lysate to attempt to identify the protein complex responsible for processing long dsRNA into siRNAs. ...