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What is an enzyme?

An enzyme is a biological catalyst. It is a protein with an active site that binds to a substrate to accelerate a chemical reaction.

Answered by Epen T. • Biology tutor

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

faster response due to the presence of memory cells

there are many more cells specific for this pathogen therefore clonal selection and expansion of B cells is quicker

Answered by Beth T. • Biology tutor
2173 Views

Explain the role of inorganic ions in the body.

The resting membrane potential of cells is maintained by the actions of Na+ and K+. A resting cell is impermeable to Na+ so the concentration of Na+ is greater outside the cell than in it. However the cel...

Answered by Callum D. • Biology tutor

6366 Views

During succession the species present changes. Explain why.

The pioneer species (or any other species) changes the environment, making it less hostile. Also some species are better competitors and out-compete others.

Answered by Alfie B. • Biology tutor

7709 Views

How is structure relevant to enzyme function?

Enzymes are functional proteins which are used to catalyse reactions. They all exhibit primary, secondary and tertiary structure, and some which have more than one polypeptide chain have quaternary struct...

Answered by Alec M. • Biology tutor

16211 Views