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Explain the process of evolution

Individuals within a population show a wide range of variation due to differences in their genes. The individuals within these species/populations with the characteristics most suited to their environment su...
SA
Answered by Seyi A. • Biology tutor
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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
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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.
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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 - antibody production is quicker theref...
BT
Answered by Beth T. • Biology tutor
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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 cell i...
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Answered by Callum D. • Biology tutor
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