Top answers

Biology
A Level

Describe how a student wouldn’t test for the presence of lipid molecules in a sample of food

The student would conduct an emulsification test. First of all, crush the sample to increase is surface area. Next add the sample to a test tube of ethanol, allowing  for he sample to disolve before addin...

TS
Answered by Tobias S. Biology tutor
2263 Views

Describe how a new phenotype may arise in the population and increase in frequency using the theory of natural selection.

A mutation arises in an individual that confers a selective advantage.  The phenotype the mutation produces is selected for by natural selection and so the individual survives to reproductive age.  This m...

KA
Answered by Katy A. Biology tutor
2039 Views

What is the Krebs cycle?

Photosynthesis has four stages:

  1. Glycolysis. 

  2. The Link Reaction.

3. The Krebs Cycle. 

  1. Oxidative Phosphorylation...
MS
Answered by Megan S. Biology tutor
5262 Views

Name the first stage of respiration. How many net ATP molecules are produced?

Glycolysis - 2 ATPs (net) are produced. 2 are input into the reaction and 4 are produced as a result.

LW
Answered by Lydia W. Biology tutor
2353 Views

How does the body's response to a second infection by a bacterial pathogen differ from the first? (3 marks)

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