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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How to name restriction enzyme used to cut both the foreign DNA molecule and plasmid [closed]

I have researched and found out that the names of restriction enzymes are derived from genus, species, and strain but on this illustration that our professor gave us, there's no genus, species, and ...
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renal portal system

I am a high school student. In my textbook it is written that Mammals don't have renal portal system because they have four chambered heart. I understand that the four chambered heart keeps the ...
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Check simple human fetus answers

Based on this image and questions, could someone please check my answers? Question 1: At which one of the following points will the blood passing the point be more oxygenated after birth than before ...
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1answer
56 views

What is the thickness of the membrane if only alpha helixes are embedded of a transmembrane protien?

Given is the representation of a transmembrane protein. Calculate the thickness of the membrane if only alpha helixes are embedded in it. One turn = 5.4Å Please read: The reason I didn't submit my ...
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68 views

Confusion about how to compute probabilities for linked genes

I am confused about how to compute probabilities for linked genes. The problem that I am solving is this: P generation: AAbbddEEff X aaBBDDeeFF. If A and B are 40 centimorgan apart, what is the ...
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1answer
62 views

How deep underwater could you breathe using a tube which breaks the surface until the water pressure makes it impossible to inhale air?

I'm struggling with a question asking how deep you can breathe underwater using a hollow reed before the water pressure makes it impossible to inhale. The question asked to use this data of maximal ...
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2answers
103 views

Why do genes, encoding the same proteins and in the same conditions, have different expression?

Is it possible that two genes, which come from two different cell cultures and which encodes the same protein, produces different quantity of mRNA? If yes, why? My question comes from the fact that I ...
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1answer
42 views

Am I reading this respirometer correctly?

I want to double check that I'm reading these respirometer vials correctly. The volume O2 of the following vials should be: Squirrels in Torpor: E1: 0.4 E2: 5.0 E3: 0.3 E4: 5.1 E5: 0.4 E6: 0 Squirrles ...
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1answer
47 views

exercise of gene linkage in genetics

Could you help me solve this problem: AAbbCC is crossed with aaBBcc and the offspring re-crossed with aabbcc. Considering that A and B are linked and their distance is 12 mapping units, while the gene ...
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107 views

Get “DNA” of one parent based on its children [closed]

I'm no biology expert so bear with me, but I've been given a task to estimate alleles of an animal based on the animal's children and the children's other parents. I've looked up Mendel's laws but I'm ...
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3 primers to know if Homozygous, Heterozygous or WT

In this imaginary experiment, I am using T-DNA to make an insertional mutagenesis that will get randomly inserted into the DNA where it might get inserted within a gene, disrupting it. In order to get ...
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2answers
51 views

Cystic Fibrosis Genetic Risk Determination

Let's say Jane has Cystic Fibrosis and we know her brother doesn't. What are the chances of her brother's future child having CF? (The chances of Cystic Fibrosis in the general population can be taken ...
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What are the advantages of long read sequencing for cancer oncogenomic research?

Currently I am using whole genome nanopore sequencing, Illumina short read and 10x linked read to study oncogenesis mechanisms of certain types of rare cancer. I am wondering about the advantages of ...
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1answer
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Should I consider one or two DNA chains to find how many nucleotides are in a gene?

I am trying to solve an exercise. How many nucleotides does a gene contain if information about 287 amino acids is encoded in it? What is the molecular mass and length of this gene? AFAIK, I have to ...
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Which condition is most likely to cause a buildup of materials in the lysosome?

Stated below, I must answer a question related to lysosomes. I am unsure of the answer, and have explained my reasoning after the question. Lysosomes contain hydrolytic enzymes that derive from the ...
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1answer
143 views

Primary function of cell wall is [closed]

A. Controlling volume B. Providing shape C. It's selective permeability D. Protection against bursting To me, all the given options seem correct except C. A and D are correct when the cell is placed ...
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1answer
167 views

A mutation question from the Indian National Biology Olympiad

DNA was isolated from wild type (Gal+) and mutant (Gal-) E. coli cells and separated by density gradient centrifugation technique. DNA from Gal- strain acquired a lower position. This indicates that ...
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Question regarding genetic variance and heritability

According to early studies (performed by Wright) on guinea pig coat color, the total variance in a randomly mating strain was 0.573. The variance in an inbred strain was 0.340. From correlations ...
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2answers
60 views

Next Generation Sequencing False Negative [closed]

In Variant Detection, RNA-sequencing, and ChIP-sequencing, we showed how we matching, or aligning, short NGS reads to the genome, and then make inference using the reads which aggregate or "pile ...
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Help identifying a part of a flower

I researched about floral diagrams and this is what I found:- This is floral diagram of Theobroma cacao. I managed to identify others but this part near the stamens was not found anywhere. Also the ...
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1answer
45 views

bunsen vs meker for best sterile field [closed]

I need one bunsen and i have a friend that sells me a bunsen-meker burner. I see that bunsen-meker burners have more flame diameter, so should have more diameter of sterile field, but i dont know XD ...
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1answer
138 views

Is this question about limiting factors answerable?

This is from a Singapore-Cambridge GCE O-level Biology exam (a national exam for 16-year-olds). The exam board maintains that the question is "correct and accurate"—but isn't there a typo in ...
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How do I calculate amount of nutrients retained/excreted in fish?

In preparation for my exam in fisheries and aquaculture, I looked through last years exam (with an answer sheet) and stumbled upon this multiple-choice question that I can't figure out how to solve. ...
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2answers
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Action potential attenuation in unmyelinated axons vs demyelinated axons

I learnt that action potentials travel much faster along myelinated axons, and when these axons are demyelinated the action potentials travel much slower and sometimes die out. Why do action ...
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Why does the cell initially swell, then return to original volume rather than shrink first in a hyperosmotic solution of NaCl and urea?

When a cell is placed in a hyperosmotic solution of NaCl (0.15M) and urea (0.05M), why does the cell initially swell, then return to original volume rather than initially shrink? Firstly, my ...
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157 views

genetics question

In mice, the waltzing allele (w) that causes the mouse to run in circles due to an inner ear defect is recessive to the non-waltzing allele (W). If a heterozygous mouse mated with a waltzing mouse, a)...
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my way of solving the biology question

Pure-breeding tall and pure-breeding short pea plants in the P generation were crossed as shown below. Based on the diagram below, one can assume that a)short plant height is the dominant trait. b)...
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2answers
83 views

VPg priming of the replication of RNA viruses

I'm doing a presentation on the replication of SARS-CoV-2 for my chemistry class, and I found that to replicate its RNA, the virus uses RNA-dependent RNA polymerase, which is primed by a VPg primer. ...
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Difference between the number of ps I and ps II complexes in cyanobacteria and plants

the number of photosystem I complexes are more than the number of photosystem II complexes in cyanobacteria, while this is opposite in plants. why? Is this related to the type of respiration?
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1answer
284 views

What’s the Difference Between Grass and Sedge?

What’s the difference between grasses and sedges? in terms of anatomy and classification.
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3answers
122 views

Vectors for genetic engineering

Well can a bacterium be used as a vector?I have learnt that Agrobacterium tumifacian can be used to deliver a gene of interest in plant cells but on a book in a multiple choice question it says that ...
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2answers
431 views

Stem and Branch of plants

What is the difference between the stem of a plant and the branch of a plant. Is the branch part of the stem?
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233 views

Difference between polymorphic and pleomorphic organelle

Recently, I learned that lysosomes are polymorphic and Golgi bodies are pleomorphic organelle. But what is the actual difference between these 2 term?
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1answer
159 views

why does translation occur more frequently than transcription?

In our textbook it says that translation occurs more in a cell than transcription but I couldn't find anything that explains why it happens
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1answer
37 views

Are stroma lamellum and grannum lamellum the same?

I have a picture in my textbook that is confusing me as to how they are different.I tried looking for some info on the internet, but could'nt get it clear.Please help me.
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1answer
34 views

RFLP Pedigree question

A relatively frequent, completely penetrant recessive disease variety of mutations in the gene. The gene has been recently cloned. Analysis of the region flanking the gene reveals that the population ...
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1answer
96 views

Pedigree - Dealing With Unknown Parent Genotypes

I'm dealing with a pedigree problem, and I'm having some trouble dealing with problems of unknown parental genotypes (where there are multiple possibilities). This is not a homework question; it's an ...
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1answer
140 views

Design primers for PCR from given DNA sequence

Given the sequence: 5’-ACTGACTATGTAGAA………GGCCCTAAGGGCCAA-3’ (1) You wish to do PCR of this dsDNA to add “overhangs” on the ends of it. On the 5’ end of you will put the restriction site for ...
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1answer
142 views

Why is Ibuprofen contraindicated in asthma patients?

So yesterday a patient showed up at the clinic with a massive swelling in his left face region. Upon examination it was found to be due to infected first premolar. Dentist recommended him to get the ...
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1answer
105 views

Are hormones antigenic?

I have been asked whether hormones are antigenic. I would have to think that the answer is no because they are used as various drugs such as FSH in infertility treatments without the need of ...
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59 views

Nitrogen deficiency and chloroplast function

Q. The formation of which of the following in the chloroplast is affected by a deficiency in nitrogen? (a) Glyceraldehyde 3-phosphate (b) Starch (c) Enzymes (d) Carbohydrates My thoughts: Nitrogen ...
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What is the need of mucilagenous coating in pollen grains of aquatic plants?

I'm a high school student from India and here in our prescribed biology book(NCERT), it is written that pollen grains of aquatic plants have a mucilagenous coating to protect them from wetting. My ...
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1answer
911 views

Which type of test tube should not be used for blood collection?

The following question is presented in my biology textbook: You are required to draw blood from patient and keep it in a test tube for analysis of blood corpuscles and plasma. You are provided with ...
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1answer
54 views

Photosynthesis in Higher Plants

Q:Photosynthesis in C4 plants is relatively less limited by atmospheric CO2 levels because: 1) Four carbon acids are the primary initial CO2 fixation products 2) the primary fixation of CO2 is ...
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60 views

Why do individuals vary in the number of SNPs for a given gene ( e.g. FOXO3A )?

Individual #1, sequenced by 23andMe and then inputed into Promethease for SNP data has the following SNP output: 1) rs1935949(C;T) 2) rs2802292(G;T) 3) rs13217795(C;T) 4) rs13220810(C;T) 5) rs2764264(...
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1answer
67 views

What is the effect of self envenomation on reptiles? [closed]

If a venomous lizard bites its own tongue will it die? I've searched the whole internet and I am unable to find a reliable answer on self envenomation.
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34 views

Does food grade diatomaceous earth contain mercury

Not sure if this is the right site to ask this question, but since diatomes are or once were biological creatures it seemed to fit this one more than any of the others. I have been supplementing my ...
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1answer
109 views

Which bacteria takes the longest to double?

Currently I am writing a lab report on the enumeration of bacteria. E.coli takes about 30 mins to double. That is going from 1 bacteria to 2 bacteria. I want to know which bacteria takes the ...
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1answer
34 views

Is chromosomal DNA more likely to interfere with restriction mapping or PCR analysis in E. coli?

We are characterizing YADH-1 in my biochemistry lab course. Over the course of the first weeks, we harvested E. coli cells, and isolated plasmid DNA via alkaline cell lysis. A previous exam for the ...

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