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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72 views

Advanced Higher Biology 2017 - EPT Index

I was recently completing a biology past paper the Scottish SQA 2017 Advanced Higher Biology Qualifications. The question is as follows: To solve this, I did: EPT Index = 100*(striped stonefly + net ...
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0answers
85 views

eosinophil question

Which of the following statement(s) is/are incorrect? A. All cells of the immune system originate in the Bone Marrow B. Lymphoid progenitor cells originate from a pluripotent stem cell C. B cells ...
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1answer
35 views

Sex determination in Drosphila [closed]

Ive been taught that its based on genic balancing. But I recently saw this question that has caused me some doubt. I thought it would be the 1st option but unfortunately they said it to be the 3rd. ...
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1answer
56 views

What is the type of conservation in which seed banks are an example? [closed]

Firstly I think this question is quite ambiguous (I did not come up with it) so sorry. I have only come across 4 'types' of conservation: environmental, animal, marine, and human conservation. I am ...
2
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1answer
279 views

How would one go about isolating a specific mRNA out of a pool of others? [closed]

I'm writing an essay about DNA recombinant techniques where the question asks to outline all the steps to arrive at having a colony of bacteria expressing a gene of interest.The question makes you ...
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2answers
45 views

Number of different clones of B lymphocytes

My professor told us that there are about a million different B cells based on their surface receptor. I have read that we have about 30000 genes in all. Since receptors are proteins how do these ...
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1answer
31 views

Prove that the worms are unicellular

In Biology class our teacher divided the class in two groups. Our group(i'm in) has to prove that the worms are unicellular(although it is not true). The other group has to prove that we are wrong. ...
2
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0answers
51 views

Sucrose inhibit onion root mitosis? Why?

I am doing an experiment about onion root growing. I had put an onion in different solutions of $C_{11} H_{22} O_1$ in H2O —with the root touching the water—: 0,1M; 0,2M; 0,3M; 0,4M; 0,5M. The ...
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1answer
49 views

Understanding Genetic Dynamics of Specific Problem

The following questions comes from International Biology Olympiad 2014, theoretical part B. It states: Earlier research suggested that the red flower pigment of plant species was the result of a ...
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1answer
136 views

law of independent assortment [closed]

Self fetilization of F1 dihybrids, following independent assortment of alleles result in: ...
4
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1answer
555 views

Which statement is incorrect for Rubisco?

My question is this: Which of the following is NOT correct for rubisco? a. It is the most abundant enzyme b. It catalyzes two different reactions c. It is involved in photorespiration d. It is not ...
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2answers
3k views

Genes & Map Units

Two genes of a flower, one controlling blue (B) versus white (b) petals and the other controlling round (R) versus oval (r) stamens, are linked and are 10 map units apart. You cross a homozygous blue ...
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2answers
2k views

Why aren't 'exons' named 'introns'?

Why are introns called 'introns' when they are the actual ones who are getting spliced out from the pre-mRNA. Shouldn't exons be named introns as they are the ones that are 'in' and are not 'exiting'? ...
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1answer
183 views

How do you find probabilites of carrying an X linked recessive disease in a blank pedigree given only one phenotype?

In the above pedigree, the black square indicates the male affected with Hemophilia which is a X-linked recessive trait. What is the probability that the proposed child, which is a male (indicated as ?...
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2answers
141 views

Is the xylem like a tissue paper?

I am a 5th grader learning about the plant transport mechanics and I learnt that the xylem is made up of dead cells.So if water travels up the xylem and water travels only 1 way, is it like how water ...
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2answers
594 views

Intermediate of Krebs cycle that can form Chlorophyll?

This was a question in a test in my school today. Q) Which intermediate of Krebs cycle further can form chlorophyll? A) Oxaloacetic acid B) Citric acid C) Succinyl CoA D) Fumarate Given answer was ...
7
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1answer
225 views

Why does the olive tree produce a bitter tasting fruit?

What is the survival value for the olive tree to produce a bitter tasting fruit, even when it is ripened? I realize some fruits and berries are species specific, i.e., meant for specific animals to ...
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1answer
117 views

Mathematical model about the relationship between two animal species

I'd like to relate a mathematical model with two animal species. This is the model: $$ \begin{split} \frac{dN}{dt} & =rN-\frac{rN(N+M)}{k} \\ \frac{dM}{dt} & =r'M-\frac{r'M(N+M)}{k'} \end{...
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0answers
47 views

Homework: Diffrentiate between 2 toads

How to differentiate between 2 toads one of them result of artificial parthenogenesis and the other from renucleation? I answered that the toad resulting from artificial parthenogensis is identical ...
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1answer
75 views

Homework - Genetics linkage problem

A farmer purchases f1 hybrid seeds. These seeds contain four heterozygous loci that give a significant increase in crop yield when compared to either homozygote. Two of these loci are on the same ...
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2answers
5k views

Unsure about definition of “n” and “C” values in mitosis

I am preparing for a Biology exam and I'm reviewing the "n" and "C" notation used in mitosis. My professor said that when the cell replicates its DNA in S phase of mitosis, we get twice the "amount" (...
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4answers
188 views

Best fundamental books? [duplicate]

I’m looking for internationally applauded textbooks on fundamental biology. Books that are a must for a pre-medicine student/high school advanced. Currently, I study Biology by Neil Campbell, Jane ...
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1answer
349 views

Which function do nicotinic receptors have in the periphery?

I came across this question today, it says: Nicotinic receptors stimulation is directly responsible for ….... I should fill the spaces by one of the following choices: Increasing the excitability ...
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1answer
150 views

R nought calculation ( SIR model)

1 person gets bitten by 9vectors /night, the vector transmits the pathogen to 0.035 new hosts. Duration of infection: 9.5 months.What is R0? I am struggling with this question for ages as I would ...
3
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1answer
643 views

Question about different gametes that can be produced

I have a question from a past exam that asks the following: "For the organism of genotype AABbCcDDEe (homozygous for 2 genes, heterozygous for 3 genes), how many different types of gametes will be ...
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1answer
89 views

Serial dilutions

A student wants to make serial dilution of a sample. She starts with a 1mg/ml sample and 10 tubes, (labelled 1-10) each containing 2 ml buffer. The student puts 1ml of sample solution into tube 1 ...
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1answer
424 views

Questions about apoptosis [closed]

Is apoptosis a part of cell division? Can apoptosis occur if DNA is damaged beyond repair?
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2answers
103 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
671 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
95 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
630 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
25 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
73 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
196 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 ...
4
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1answer
137 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 ...
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1answer
634 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 ...
0
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1answer
674 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
2k 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 ...
2
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0answers
209 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
940 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 ...
5
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2answers
3k 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
288 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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2answers
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 ...
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0answers
72 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
661 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
135 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
301 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 ...
4
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1answer
961 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 ...
2
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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 ...