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Biology
A Level

Compare and contrast the structure of DNA and RNA (3 marks)

Similarities: - Both consist of a pentose sugar, a phosphate group and 4 nitrogenous bases.- Both are joined by covalent phosphodiester bo...

Answered by Anna A. Biology tutor
12736 Views

Describe and explain how temperature affects the rate of an enzyme-controlled reaction?

Up to the optimum temperature (around 37 degrees Celsius) kinetic energy increases. So the likelihood of successful collisions between the active site of the enzyme and substrate increases. More e...

Answered by Enya F. Biology tutor
4631 Views

Outline the process of ATP generation by chemiosmosis.

This is a process that occurs on the membrane of the mitochondria. Here the electrons are passed from one electron carrier to the next in a chain know as the electron transport chain. With each carrier be...

Answered by Anushri J. Biology tutor
3567 Views

Can you explain the four levels of protein folding?

Proteins form from basic structures and fold into larger, more complex ones. They start as simple chains of amino acids, this is known as the primary structure of a protein. They then fold into secondary ...

Answered by Caitlin C. Biology tutor
2358 Views

What is the difference between a saturated and an unsaturated? (2 marks)

A saturated lipid has no carbon double bonds in the R group of the fatty acid.An unsaturated lipid has one or more carbon double bonds in the R g...

Answered by Lydie K. Biology tutor
2925 Views

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