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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45 views

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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48 views

Differentiating open eyes and closed eyes signals [closed]

We were given the task of differentiating whether a given signal is of open eyes or of closed eyes with the use of Fourier transform. I have been checking online and I've been seeing things like alpha ...
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2answers
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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
39 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
101 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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12 views

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
24 views

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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28 views

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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51 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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43 views

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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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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244 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
101 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
168 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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141 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
113 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
22 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
29 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
56 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
84 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
82 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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0answers
54 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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46 views

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
807 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
52 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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57 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
65 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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22 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
104 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
33 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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2answers
92 views

Meaning of a negative value for non-fiber, non-sugar carbohydrate based on a nutrition label

One of the questions for my lab is to find the non-fiber, non-sugar carbohydrate per serving of an onion. Now the total carbohydrate for this onion is 11 g, the total sugars for the onion is 9 g, and ...
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40 views

What is the chemical structure of myosin? [closed]

What is the chemical structure of myosin? Specfically, what functional groups or monomers are they made of?
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66 views

What disease does Saccharopolyspora erythraea cause?

For an examination assignment I have to find a disease caused by the bacterial species Saccharopolyspora erythraea, but I have searched the internet and have found no report of patients being infected ...
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1answer
65 views

How to find which genetic pattern is responsible for structure of a cell

I studied that DNA are blueprints that describes an organism. How do I learn more specifically about DNA regions responsible for storing structure of a cell. By Structure of a cell I meant to ask ...
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1answer
338 views

Reptiles are a paraphyletic group because?

Here is a question I am trying to find the answer to Reptiles are a paraphyletic group because... ? A) They include worm lizards, which have no limbs B) The group doesn’t include birds C) The group ...
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1answer
65 views

Water potiental

I think solution x should be present at Z as this solution has moved out of cell causing cell to be plasmolysed but the answer is Y. How?
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49 views

Cooperative Enzyme Question

I'm currently studying for the MCATs. After doing some biochemistry practice questions, I came upon a question that I believe may be incorrectly posed. I was wondering if I'm correct in saying this or ...
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1answer
103 views

Do all restriction enzymes have palindromic recognition sites?

I am trying to find out the requirements for a segment of DNA to be the recognition site of a restriction enzyme. Acording to the article on Restriction Enzymes in Wikipedia, "many of them" (...
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44 views

My understanding of chromosomes and the processes related to them is lacking [closed]

I'm sorry for the incredibly simple question, I just can't seem to find any answers elsewhere online. I am a high school student currently studying for the upcoming AP biology exam, and recently I ...
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0answers
22 views

The correlation between a leaf's age and its length in the initial stage of growth [closed]

I am building a machine learning algorithm which predicts the age of a leaf before its maturity period based on its measured length or area. I would like to know whether there is a mathematical ...
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1answer
58 views

Can anyone help me with these Biology evolutionary properties homework questions? [closed]

my teacher assigned these worksheet questions, they are ungraded, but he said something might come up on the test really similar to this so I really want to get all of them right. I am pretty ...
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1answer
99 views

Meaning of PAM matrix values

If PAM-1 matrix refers to time or evolutionary event for 1% change in amino acid sequence of a protein then how come there is PAM250? shouldn't PAM 100 be the highest where the two concerned sequences ...
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1answer
37 views

when you are to non-culturally detect the presence of E. coli in the soil from a cow pasture?

You are to non-culturally detect the presence of E. coli in the soil from a cow pasture. You do this by extracting the total DNA from a sample of the soil and PCR amplifying with E. coli-specific ...
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1answer
5k views

Calculating Possible Combinations of Bases in a DNA Strand of a Given Length

In my Biology class we were asked this question: This DNA strand consists of eight pairs of nitrogenous bases. How many different sequences of eight bases can you make? Explain how you found your ...
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1answer
203 views

Is Protein-to-DNA ratio a good estimate of cell size?

I need help interpreting the result of an experiment. My class performed an experiment measuring protein concentration between heart, liver, and kidney tissue samples. The results were: Heart: 4.714 ...
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88 views

True or False: Endocytosis delivers vesicles directly to the cis face of the Golgi complex

Does anyone know the answer to this question, and also the explanation of to why this is True or False? I know that Endocytosis is the process of uptake of materials into cells including ...
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1answer
851 views

Why is a urea solution hypotonic relative to RBC?

If I place a RBC in 0.5M urea we see haemolysis. My textbook says that "the solution is hypotonic. Urea enters the RBC down it's concentration gradient. Water follows the movement of urea by osmosis. ...
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3answers
153 views

Evolution question on speciation? Really confusing!

Okay, my teacher assigned this homework question, but nothing like this was ever given in our textbook. Suppose that a type of tree tends to speciate over 10 million years and a species of fly tends ...

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