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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

BT
Answered by Beth T. • Biology tutor
2353 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

6666 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

8032 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

22884 Views

How do plants alter the way in which they grow in response to light?

Plants have photoreceptors in the tips of their shoots. If light is detected from a specific direction, the plant will produce auxins which diffuse fown the shoot of the plant. The auxins increase in conc...

Answered by Iona N. • Biology tutor

2238 Views