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

1
vote
1answer
77 views

Population Genetics Question

Can someone please help with this question? Here is my working (just in case it is not clear: 1/300*1/30*1/2) but is this actually correct or do I need to multiply by 0.5 once again? I appreciate ...
0
votes
1answer
56 views

Bilayer synthesis? [closed]

If we want to design a bilayer from Myristic acid (14 carbon fatty acid). The average bond length between C-C is 1.5 A. What will be average thickness of the membrane? Edited to include the OP ...
0
votes
1answer
48 views

Quantitative Traits Genetics

Can someone please help with this question? I'm not so sure whether part A should be 11 inches or something else. Also, is part B correct
2
votes
2answers
308 views

How much of your stock solution should you take to make the 1000 cells/mL mixture? [closed]

You need a solution containing 1000 buccal cells/mL. You count that you have 125 buccal cells in 50uL, from a total solution of 8 mL. How much of your stock solution should you take to make the 1000 ...
0
votes
1answer
82 views

Dimensional analysis Question

So I'm new to the dimensional analysis world and I'm little confused and the answers I'm getting are not convincing :( if the concentration of hemoglobin in a 5ml sample of blood is 34 g/dL. and red ...
1
vote
1answer
126 views

Is Natural Selection like a Copy Editor?

I am stuck on a Homework Question. It says: Evaluate the following statement: “Natural selection works like a copy editor; it works only with what is already present in a population.” (Note: ...
1
vote
1answer
46 views

What is ischaemia exactly?

I think it is decreased blood supply to organs and tissues. I also think it is the stopped circulation. However, both ones cannot be right, I think. What is ischaemia exactly?
2
votes
1answer
88 views

Lytic Viruses — Cell lysis?

So in the video my instructor sent on viruses, he said that for lytic viruses, new viruses manufactured by the host cell could get out of the cell in one of two ways. The new viruses would leave by ...
1
vote
1answer
52 views

Gene Complementation Question

Hi everyone! Here is a diagram of a genetics complementation problem. My main concern is regarding number 3d. I'm assuming that in this case, it would be complementary interaction and thus ...
2
votes
1answer
67 views

Hibernation in ectotherm and endotherm

Both snake and weasel hibernate. Which of the following is correct? A. They will die when temperature decreases below the critical temperature. B. Weasel will die when temperature ...
2
votes
2answers
365 views

Promoter in the lac operon

Here is the question: Suppose an experimenter becomes proficient with a technique that allows her to move DNA sequences within a prokaryotic genome. If she moves the promoter for the lac operon to ...
1
vote
1answer
110 views

Genetics independent assortment?

As indicated in this question, what do you think is is the best explanation for the observed progeny, is it because distance between genes affects recombination frequency? My main concern is ...
5
votes
2answers
3k 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. ...
0
votes
1answer
123 views

Gene pool simulation [closed]

this simulation, you sampled the gene pool without replaceing beads in the beakerafter you drew each one. Thus, f(A) and f(a) in the gene pool changed slightly after each bead was drawn. For example, ...
1
vote
1answer
34 views

What are the best detection medias for cholera?

I heard this fact that you can use some [hypertriade] for vibrio cholera diagnosis which has compontents sucrose (yellow) mannose (yellow) arabinose (do not ferment; stay dark pink) I did not find ...
0
votes
1answer
79 views

calculate the number of heterozygotes [closed]

The ability to taste PTC is due to a single dominant allele "T". You sampled 215 evolution students, and determined that 150 could detect the bitter taste of PTC and 65 could not. Assuming this trait ...
0
votes
2answers
89 views

What is the right spelling for this agar? [closed]

I could not spell the agar [gonoline-uroline] which I heard yesterday. My spelling is so wrong that I could not find it in Google. What is the right spelling for this agar?
1
vote
1answer
252 views

question about directional selection

Cattle breeders have improved the quality of meat over the years by which process? A) artificial selection B) directional selection C) stabilizing selection D) A and B E) A and C I know the answer is ...
2
votes
1answer
98 views

Regarding kidney transplant

One of the options is correct Kidney can be taken from a dying person who has the a) cessation of neurological function only b) cessation of cardiac function only c) cessation of ...
0
votes
2answers
139 views

DNA sequence from the middle of a gene

Someone gives you a short DNA sequence that comes from the middle of a gene. 5'- TCTAACTGATTAGC -3' 3'- AGATTGACTAATCG -5' From this sequence, determine the ...
3
votes
4answers
133 views

Translation of mRNA?

We inserted an insulin gene from human into bacteria. Will translation of the gene (protein formation) occur in bacteria? If translation occurs then why does it occurs, give a reason for this?
0
votes
1answer
160 views

vestigial structure question

If a species has a vestigial anatomical structure that it no longer uses, would you expect this structure to disappear over many generations through the action of natural selection? Always, sometimes, ...
1
vote
1answer
31 views

Correlating Ki values of pesticides to bacterial growth

Four pesticides P1 to P4 are reversible inhibitors of an enzyme E that is essential for the growth of a bacterium B. Their Ki values are given in the table below. Each of these four pesticides ...
0
votes
2answers
47 views

Is there any format for official Physiological/Medicine answers? [closed]

Assume you have an exam which has 5 extensive questions and 60 minutes. You do not have time to cover most if you write everything in essay format. If you start to write essays, you do not really have ...
2
votes
1answer
151 views

Why Can Varied Species Live Together in Particular Ecosystems?

Consider the following question: The Piney Woods of Eastern Texas is home to a wide variety of organisms ranging from the grass Longleaf Oats to coyotes. Which of the following best explains why ...
0
votes
1answer
97 views

Regional circulation and Cardiac output? [closed]

I am reading my study materials and think what is the systemic POV here Regional circulation Blood flow within the tissue/organs based on the functional demands of the tissue. E.g. The ...
3
votes
2answers
139 views

Question about Autosomal Recessive Alleles

I had a homework question that I could not figure out. It states: A woman has cystic fibrosis in her family and did not want to have a child that suffered from the disease. She and her spouse ...
2
votes
2answers
5k views

How do trees use Adhesion and Cohesion to move water against gravity?

I have an AP Bio class where I have to name 3 properties of water and I chose adhesion and cohesion for one of them. I'm having trouble finding out how exactly trees use adhesion and cohesion to move ...
1
vote
0answers
25 views

recombinant gametes

Suppose you are able to observe under a microscope the total number of meiotic divisions occurring in one gonad of a given individual and to outnumber exactly the crossovers between two given ...
3
votes
1answer
770 views

Classification of glycosidic anomeric bonds (alpha vs. beta)

In the process of studying for my upcoming biochemistry exam, I have stumbled over the classification of glycosidic bonds. I want to be able to distinguish $\alpha$- from $\beta$-glycosidic bonds. ...
1
vote
2answers
98 views

Removing a restriction site and introducing other at its place

What would you do if you want to remove an EcoRI restriction site and introduce BamHI restriction site at apprx. the same location ? One of the answers in my textbook was : To construct a DNA ...
2
votes
1answer
53 views

Evolutionary conservativeness

List the following proteins in the order of decreasing evolutionary conservativeness of their primary structure: Somatotropin. Catalytic subunit of a DNA – polymerase. Histone H1. ...
1
vote
1answer
209 views

Genetic Epistasis Question

I need help with this practice question. I'm assuming that would a epsitatic recessive question since the parents are true breeding and then the ratio would be 9.3.4. But I am not so sure. Any ...
1
vote
1answer
112 views

Pedigree Diagram help

I am asked to fill the genotypes in the spaces provided but looks like I am aving a little bit of trouble. can anyone help? thanks in advance!
0
votes
1answer
121 views

PedigreeAnalysis Genetics [duplicate]

Hello! I need help with this exercise question. I am not really sure which pedigree diagram is autosomal and which is not. But, is question b 1/2. Can someone give an explanation? Thanks very much ...
0
votes
1answer
56 views

probability of having normal daughter

If father has hemophilia, mother is a carrier of the disease, then what is the probability of having a normal daughter ? My question: Should the probability of having a daughter be also ...
1
vote
1answer
40 views

Vesicular and non vesicular transport

I have to classify them either as transported in vesicles or without vesicles. What I think - Non-vesicular 2.vesicular 3.vesicular 4.vesicular 5.non-vesicular 6.vesicular 7.vesicular ...
1
vote
2answers
571 views

Gel electrophoresis after RNAse treatment

I do not understand how to solve this question. I know that RNAse will cut smaller pieces of RNA. The answer given is A
2
votes
1answer
260 views

recombination frequency problem

Three loci C, D and E are located on the same chromosome in this order. We found that the frequency of recombinants between C and D is 10% and that between D and E it is 20%. Assuming that ...
1
vote
1answer
73 views

Linkage distance calculation

What is the map unit distance between L and S allele ? My working : If we take the normal ratio :9:3:3:1 , first one should be 9/16 = 0.5625 and then subtract 0.51 from it, we get 0.0525, ...
1
vote
1answer
78 views

Blood group probability question

My answer ( after rounding off) is 9% -100( 0.75 X 0.25 X 0.5) but the answer given is 22 % Am I correct ?
0
votes
1answer
54 views

Identifying mutations in a yeast strain

Cells of a triple-mutant yeast strain (leu- his- trp-) were spread either on minimal medium or on minimal medium supplemented with various combinations of histidine, leucine, or tryptophan. The ...
0
votes
1answer
181 views

How can synonymous mutations lead to cancerous or tumorous phenotypes?

After analyzing DNA sequences of an oncogene from many human cancer patients, you found that synonymous substitutions occur in a specific codon of this oncogene. Assuming that these synonymous ...
3
votes
2answers
128 views

Which restriction enzyme would i use?

Plasmid pBr322 includes two genes that confer antibiotic resistance: a gene for ampicillin and a gene for tetracycline. The cutting site for the restriction enzyme BamH1 is in the middle pf the ...
2
votes
1answer
78 views

Determining sequence of oligoribonucleotide

Oligoribonucleotide X was treated with phosphatase (for removal of 3' and 5' - terminal phosphates), then with RNAase T1, which cleaves all phosphodiester bonds located in a 3' position of ...
0
votes
4answers
302 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?
1
vote
1answer
684 views

Number of reading frames in nucleotide sequence

In class of molecular biology was posed this question: "How many reading frames start in sequence of nucleotides 5' ... ATATGAATGATGACAT... 3' ?"
0
votes
1answer
21 views

Order of events in hibernation

Arrange this in sequence : i. Heat loss exceeds heat production. ii.As body temperature falls, heat loss decreases. iii.Body temperature equals environmental temperature. ...