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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17 views

Difference between mitosis and meiosis [closed]

What cells undergo mitosis, and which ones undergo meiosis. And, on each, what are the different phases?
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What is cell mitosis? [closed]

What are the different stages of mitosis, and how often do cells undergo this process? I know it starts with prophase, but I forget the subsequent steps.
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calculating PCR cycles initial amount [closed]

I have an exercise problem . I have to calculate the number of cycles of a DNA sequence that is 420 bp . we use a buffer that contains 1.5ng dNTPs and the molecuar weight is 487.0 gr/mol and . now i ...
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1answer
52 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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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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10 views

Amylase slowing down fermentation?

I was doing a fermentation experiment with different types of corn substrates and noticed that experiments with amylase actually slowed down the fermentation rate compared to a treatment without ...
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1answer
71 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
31 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
62 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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38 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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60 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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23 views

How does Brachygastra mellifica honey differs from Apis mellifera honey?

I need help in a reserach paper. I'm writting about bee's and wasp's honey and how do they differ in amout of glicose, taste (that's usually down to the flowers that they snack on), if it's made (and ...
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19 views

Immunological response to antibodies? Streptokinase?

Why is it not recommended to use streptokinase in the event of a second clot shortly after the first? In this graph below is an illustration on the amount of antibodies to streptokinase in the blood ...
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1answer
63 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
99 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 ...
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1answer
36 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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27 views

Apoplast pathway, down a water potential gradient or not?

So, I was doing a AS level MCQ, the question tells us that water passes across the leaf tissues by different routes as a result of 1) differences in water potential 2) the pull transmitted by ...
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38 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
75 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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27 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
51 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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23 views

Difference between Apo(a) and ApoA-I

I’ve been searching about apolipoproteinA-I and found some research papers about apolipoprotein(a). May I know if they are the same?
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1answer
72 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
35 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
457 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
165 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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78 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
297 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
122 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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1answer
122 views

How do I determine this logistic growth model formula?

The Question Two yeast cells were placed into a special container to which food was continually added, to keep it at a constant concentration. All other factors were set for optimal yeast ...
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1answer
154 views

In plant photosynthesis, in the light dependent reactions, why is 3 ATP produced per 2 H2O?

I've been looking at the light-dependent reactions on Wikipedia and Khan Academy. This is the net reaction: $$2H_2O + 2NADP^+ + 3ADP + 3P_i \to O_2 + 2NADPH + 3ATP$$ So for every $2H_2O$ I expect $...
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1answer
110 views

What is the difference between optokinetic and vestibular nystagmus?

Optokinetic nystagmus is for stabilising the pictures we see when we are observing moving objects for example if we are rotating on an office chair. If we wear a mask while rotating however, the ...
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1answer
69 views

Blood pressure in various blood vessels and heart

What are the typical systolic and diastolic blood pressure in arteries,capillaries, veins and the heart? I know it must be highest in the arteries. arteries>capillaries>veins Arteries: 120-80mmHg (...
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33 views

About. Autosomal recessive diseases in genetics

What happens if homozygous dominant alleles are present in an individual for an autosomal recessive disease will he be affected ?
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105 views

What happens between two nodes in an evolutionary tree?

Hey guys can you help me with this one!? What happens between two nodes (in an evolutionary tree) or a between a node and a tip? A) at least one character changes B) all organisms die C) ...
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1answer
257 views

Calculating PCR Cycles

I have a problem understanding a PCR exercise, it says to calculate the number of cycles to get 1µg of the DNA fragment, starting from 10ng and then from 500ng, I know about 2^n, and the exercise even ...
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1answer
78 views

Protein electrophoresis

Three proteins A, B and C of equal molecular weight are being investigated in a study. They contain six, four and four cysteine residues respectively. Only Proteins A and B were treated with β-...
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3answers
478 views

Why does photosynthesis occur even in blue light when the photocentres are activated in red light

From Engelmann's experiment Engelmann used this device to illuminate a strand of Cladophora (not Spirogyra) with light from the visible spectrum, exposing different sections to different ...
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46 views

Monohybrid Recombinant Frequency? (three point Gene Linkage)

I am curious to know if it is completely impossible calculate recombinant frequency for monohybrids ( three point link, gene map etc.) Here is an example: Marker 1 xx= 25 xy=100 yy= 20 Marker 2 ...
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1answer
75 views

When in the cell cycle is the number of chromosomes normally reduced?

Page 96 of the Study Guide for Campbell Biology, 11th Edition has the following question: A reduction in the number of chromosomes per cell occurs a. During meiosis I b. During meiosis ...
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1answer
33 views

How are chromosomes counted at the end of mitosis in a plant cell?

Page 89 of the Study Guide for Campbell Biology, 11th Edition has the following question: A plant cell has 12 chromosomes at the end of mitosis. How many chromosomes would it have in the G2 ...
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1answer
652 views

Is pith a ground tissue with no specialized function?

Here is a question from the book My Max Score SAT Biology E/M Subject Test (where the SAT is the exam taken by American high school students): Ground tissue with no specialized function A. Xylem ...
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1answer
46 views

How many birds in this population would be expected to have either red or white feathers?

Question: The red and white feather pattern of a bird is determined by a gene that has two alleles, band R and W,which show codominance. Some birds have completely red feathers (RR),some parrots ...
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1answer
47 views

How is ligand binding modeled?

I have the following exercise to solve: To be honest, for both parts, my only idea so far would be to divide the rate expression by the sphere area and multiply by the new available areas (that of a ...
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36 views

Net electrical load of a peptide

I have to determine the electrical charge of the next peptide chain: C - E - H - P I know that this page is not there to raise doubts about this style, but I have looked for resources on the ...
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1answer
803 views

Why does this genetic pedigree show an autosomal dominant allele at one generation but not another?

Questions 186-188 of the GRE Biology Practice Test are prefaced with this genetic pedigree: Questions 186-188 refer to the following pedigree for the inheritance of a very rare human disease over ...
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56 views

What change would you expect in phospholipid orientation of the membrane if the enviornment were mostly heptane?

The external and internal environment of the cell is basically water, thus phospholipids organize themselves the way they do (bilayer). If the environment were to magically become mostly heptane, how ...
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1answer
268 views

Why doesn't oligodendrocyte produce neurilemma

I was searching literature related to neurilemma and oligodendrocyte and came across these lines from WP (Neurilemma) Oligodendrocytes do not have neurilemma because excess cytoplasm is directed ...
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1answer
67 views

Is α-keratin a fully functional protein?

Is α-keratin before it coils with another polypeptide, makes chains, and build intermediate filaments a fully functional protein? I mean, is the single monomer of α-keratin a protein or does it have ...