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Biology

A Level

Q: Describe the structure of an amino acid and the formation of a peptide bond.

Proteins are made up of organic molecules called amino acids. There are thousands of different proteins with diverse functions: storage, transport, structural support, cellular communi...

Answered by Florence M. • Biology tutor

23264 Views

What is Exocytosis?

Exocytosis is the process by which a cell secretes large substances (such as digestive enzymes or hormones) that have been produced inside the cell.

Substances produced inside the cell are...

Answered by Lucy S. • Biology tutor

12664 Views

How is an Action Potential produced in a neurone?

It is all to do with the movement of ions in and out of the neurone cell, which changes the potential difference accross the cell's membrane.

- In a neurone's resting state, the inside o...

Answered by Lucy S. • Biology tutor

4235 Views

Describe what is meant by photoperiodism

A response controlled by relative light and dark periods. The name of the receptors responsible for absorbing light are phytochromes. The photoperiodic stimulus is detected by the

Answered by Amy O. • Biology tutor

6379 Views

Could you run through the stages in the light-independent reaction (Calvin Cycle) of photosynthesis?

Okay, so here we have what seems like a very daunting list of chemical reactions to remember that don't seem to make any sense! But don't worry, with practice you wi...

Answered by Shane C. • Biology tutor

3384 Views