Questions tagged [homework]

This tag indicates that the question is likely based on a home assignment in biology-related university or high school courses or is about an elementary concept that may seem trivial to biology professionals. Please see the homework policy on meta before asking homework questions.

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124 views

What is the likelihood of a single human gene to the same gene from the other human?

The human genome comprises 3,234.83 Megabases and contains ~ 19,000 genes. It has been estimated that the genomes of humans are 99.9% identical. How likely is it that any single gene might vary from ...
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1answer
731 views

Genotype result of double fertilization

So, clearly, the endosperm would be a fusion of the polar nuclei and one male gamete. Does this mean that each male gamete would have a T allele on it? I can't seem to figure out a way to predict ...
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1answer
99 views

S.pyogenes binary fission rate/speed

For my Math IA (IB SL) I want to calculate the average amount of time that one viable S.pyogenes bacteria will need to create an ID50. I cannot find the average speed for the divison of any ...
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1answer
734 views

Onion Cells or Pear Cells?

I am researching different cells under a brightfield microscope for homework and am having trouble determining whether or not these cells are Onion cells (Allium cepa) or pear cells (Pyrus) under a ...
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0answers
27 views

response elements in transcription regulation

I'm studying eukaryotic gene regulation and I want to know whether there are some instances where transcription factors don't need to bind to response elements to initiate transcription. RNA ...
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0answers
93 views

Why is the chemical of an hexose not sufficient to ID the molecule? [closed]

Here is the homework question I have to answer to The Chemical formula C6H12O6 can mean any number of different hexose sugars that share the same chemical formula. To tell the hexoses apart, you ...
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1answer
207 views

Inoculating agar plates with microbes suspended in sterilised water?

We were having a problem with our experiment (culturing microbes on homemade nutri agar) so we decided to change our set-up. It already cost us quite some money. So, we saw this procedure. Can anyone ...
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1answer
142 views

Re-establishment of Hardy Weinberg Equilibrium After Selection

I have been given this question: In a population of 2500 mice, light-colored fur is dominant to dark-colored fur. 2400 mice originally have light-colored fur. However, an owl species moves into their ...
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1answer
662 views

How does selection affect allele frequency?

Question People who are carriers for Blooms Syndrome have developed a selective advantage. How would this affect the allele frequency of the disease allele? My thoughts Natural selection will ...
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1answer
794 views

Pros and cons of amino acid structure vs DNA sequences for evolutionary comparison [closed]

This is an analysis question for a lab on the amino acid differences in beta globin amongst different primates, and using such differences to construct a cladogram and infer evolutionary relationships ...
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2answers
2k views

Can enzymes catalyze thermodynamically unfavorable reactions?

Can biological enzymes catalyze thermodynamically unfavorable reactions? I read that an enzyme lowers the activation energy of a reaction by offering an alternative reaction pathway with a lower ...
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1answer
3k views

How does aminoacyl-tRNA synthetase recognize different tRNAs?

There are about 20 aminoacyl-tRNA synthetases, one for each amino acid. Each aminoacyl-tRNA synthetase has a binding site that recognizes a specific amino acid, and other binding areas that recognize ...
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0answers
218 views

Organ of ingestion in lice [closed]

I want to know that what the name of the organ used by lice for ingestion is? (also please explain if possible). In my research, I got this wiki page that didn't help me out. Then I found this link ...
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1answer
1k views

Function and Characterization of poly(T) and (AT)

I came across three terms; "poly(T)45", "poly(A)45" and "(AT)15". Can anyone explain what they are? I know the number refers to strand length, possibly poly-T is a strand of thymine monomers and that ...
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2answers
4k views

Frequency of dominant phenotype (Hardy-Weinberg)

The question is: The frequency of a recessive allele a is 0.6. If a population is in Hardy-Weinberg equilibrium, what is the frequency of the dominant phenotype? This question is a bit confusing to ...
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2answers
305 views

Homework question on chemically defined medium

Why would the following medium not be considered a chemically defined medium: Glucose, 5 grams (g); NH4Cl, 1g; KH2PO4, 1g; MgSO4, 0.3g; yeast extract, 5g; distilled water, 1 litre I am unsure why it ...
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1k views

Denaturation of protein

Exposure of native protein to heat leads to partial denaturation of the protein due to breaking of- a. S-S bonds b. H-bonds c. Hydrophobic interactions d. Peptide bonds After a bit of surface ...
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0answers
73 views

About cell membrane; action potential and resting potential [closed]

Ion X is negatively charged and more concentrated inside than outside the membrane potential of a cell therefore Ex (equilibrium) is positive. Ion X is unknown. Why is the equilibrium positive?
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1answer
678 views

In the process of oogenesis, when the egg completes meiosis 2, what actually happens? [closed]

oogenesis is the process of egg formation in females. The process of formation of the ovum is as follows oogonium primary oocyte secondary oocyte ovum
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0answers
136 views

How are viruses in vaccines weakened in a laboratory [closed]

I would like to know how viruses in vaccines are weakened or attenuated in a laboratory
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1answer
327 views

How many allele for one gene are found inside our cell? [closed]

I know it depends on phase. So i am talking of - 1) in human (diploid organism) with cells before prophase (before replication, when 23 pair of homologous chromosomes are present ). I think answer is ...
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1answer
1k views

Assumptions of Hardy-Weinberg rule

The post Solving Hardy Weinberg problems offers an easy explanation of Hardy-Weinberg rule. The current top answer explicitly does not talk about the assumptions of Hardy-Weinberg. A model makes sense ...
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1answer
74 views

Chromosome related problems.

1.) How many versions (alleles) of a gene can we carry if every chromosome is in pair? 2) What happens during the gamete formation (meiosis) ? Do the gene pairs stay together? 3) What happens then ...
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37 views

What is the best food to eat at this type of day since it is so vey very late? [closed]

Best food to eat? In this time of the day because it's late very soon to be
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2answers
12k views

Solving Hardy Weinberg problems

I really fail to understand Hardy-Weinberg equilibrium and can't find an easy enough source of information. Can you help me to understand Hardy-Weinberg equilibrium? My goal is to be able to solve ...
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1answer
2k views

What information does the nociceptor relay to the brain about stimuli below threshold?

A. The duration of the stimulation B. The location of the stimulation C. The membrane potential at the site of stimulation D. None of the above I think the answer is B, because when the nociceptor ...
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1answer
3k views

Digestion of milk in humans

The intial step in the digestion of milk in humans is carried out by which of the following enzymes? A) lipase. B) trypsin. C) rennin. D) pepsin. I'm confused between the C and D option. as it'...
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0answers
151 views

For which taxonomic levels are xylotomical, embryological, and palynological evidence each most useful in determining species relationships?

From the 2010 USABO Semi: In plant systematics, three lines of evidence may be useful in determining relationships; xylotomical (wood anatomy), embryological and palynological. Match these ...
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0answers
2k views

Solute potential of sucrose relative to NaCl

Does 1M NaCl or 1M sucrose solution have a more negative solute potential? I was thinking that for the same volume of solution, (eg 1 dm^3) there will be 2 mol of ions in NaCl solution and 1 mol of ...
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1answer
468 views

Signaling pathways with Receptor Tyrosine Kinase clarification

This question is regarding signaling pathways with RTKs, Receptor Tyrosine Kinase. The picture posted has one thing wrong with it and I am supposed to figure out what that is. What I have come up ...
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1answer
52 views

Boiling A frog in a sous vidè bath [closed]

So if i were to use a sous vidè water bath and a frog and slowley raised the temperature say 1 to 2 degrees a day would they survive harsh boiling water through thermoregulation
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1answer
344 views

Problem with an analogy (Cell Membrane)

I'm studying biology for the first time seriously. I've been reading OpenStax College's material. In the section of "The Cell Membrane", I have the following problem: Choose the answer that best ...
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2answers
308 views

Question on Viruses [closed]

A recent study has provided evidence that two types of equine (horse) herpes viruses have an unusually broad host range. This fact supports which of the following statements? a. The lytic cylce occurs ...
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1answer
157 views

DNA mutations in CHO-KI mammalian cells

The mammalian cell line CHO-K1 has 24,383 genes. After 70 doublings (from a starting number of cells, 1) a total of ~4,000 mutations have occurred in the overall population of cells (i.e. not all in ...
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1answer
301 views

Terminology regarding sensory receptors

I was recently asked the following question: Compare the following pairs of receptors in the same sensory system. Include in your discussion: The distribution in the sensory epithelium;...
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0answers
891 views

When is it unacceptable to measure dry mass in an experiment to measure growth of plants?

I'm an A level student (British high school final year) and I was doing an exam question which asked for the design of an experiment to test the effect of light intensity on the growth of a certain ...
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1answer
290 views

Diploid cells and number of chromosomes

I'm struggling to get a hang on this. I'm getting confused by this sentence from one of my tests: Each human diploid cell has two sex chromosomes and _____ autosomes. I'm guessing they're meaning 46,...
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1answer
2k views

What is the meaning of “The Molecular Basis of Disease” [closed]

What is the exact meaning of The Molecular Basis of Disease? I have one assignment which involves presenting Molecular Basis of a Disease. I am not really sure what points to add.
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3answers
4k views

What is the difference between the evolution of fins in whales and fish?

For a homework assignment I received the following question: Which statement best explains the evolution of fins in whales and fish? a. The common ancestor of whales and fish possessed genes for ...
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1answer
223 views

Molecules responsible for reading amino acid language

The molecules responsible for reading the language of amino acids and nucleotides is: RNA polymerase enzyme mRNA tRNA DNA I don't actually understand what "reading amino acid ...
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2answers
134 views

Homework problem:Introductory genetics

The problem is as following: Primary Ciliary Dyskinesia (PCD) is caused by an autosomal recessive gene. 50% of patients with PCD also have Kartagener Syndrome. Josh has Kartagener Syndrome. What is ...
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1answer
259 views

Adding the Propionyl-CoA Pathway to E.coli

So I'm trying to simulate the production of 3-Hydroxypropionic Acid with E.coli via the Propionyl-CoA Pathway. However I'm not really sure how the production in the pathway goes. I got the following ...
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1answer
312 views

How to know what the expected value is? [closed]

I am confused as to how I was meant to know E for a X^2 test in the following question: 2.i and 2.ii give no more information. Not knowing what to do I used E as 0 for the first row and 40 (3+37) ...
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1answer
314 views

Complementation cloning: what, why and how? [closed]

I get that you're cloning a whole cDNA library, but why does E. coli need a complementary gene to allow the gene expression? Why is that complementary gene considered to be a mutant? AND how does ...
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3answers
893 views

Is the start codon regarded as part of the UTR (untranslated region)?

The Wikipedia entry for Gene contains the statement: The transcribed pre-mRNA contains untranslated regions at both ends which contain a ribosome binding site, terminator and start and stop codons. ...
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1answer
122 views

How closely related will your descendants be to you?

I wonder how similar my DNA will be to that of my great-grand-children. If a new person enters my family tree every new generation, he/she will bring in half of his/her DNA, therefore decreasing the ...
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1answer
740 views

Is some of the energy of food lost during digestion?

I know that chemical energy of food is converted to heat energy to be used by the body in many metabolic reactions. Specifically, I know that the breaking down of bonds is what releases energy. Does ...
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2answers
718 views

How are germ cells not reduced in number?

If germ cells produce haploid daughter cells by meiosis and are thereby "consumed" (where there was a germ cell there are then 4 daughter cells), where do the germ cells come from? I asked my biology ...
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1answer
603 views

Cellular respiration — How is the water expelled?

The equation of cellular respiration is as follows: 6 O2 (g) + C6H12O6 (aq) $\rightarrow$ 6 CO2 (aq) + 6 H2O (aq) + ATP How is the water produced expelled from the body (of course, after some ...
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1answer
4k views

Where did the nondisjunction occur?

A father with gene AC has a child with gene ACC. Where did the nondisjunction occur? (Meiosis I, Meiosis II, none of the above) I do not know because both Meiosis I and II have the possibility of ...

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