paper 2

Question 1

What term is used to describe populations of different species living in the same habitat? [1 mark]

Answer 1

Community

Question 2

Explain what is meant by the term phenotype.

[2 marks]

Answer 2

1. (Expression/appearance/characteristic) due to) genetic constitution/genotype/allele(s);
2. (Expression/appearance/characteristic due to) environment;

Question 3

Aerobic respiration produces more ATP per molecule of glucose than anaerobic respiration.
Explain why.
[2 marks]

Answer 3

1. Oxygen is final/terminal (electron) acceptor / oxygen combines with electrons and protons;
2. (Aerobic respiration) oxidative phosphorylation / electron transfer chain ;
3. Anaerobic (respiration) only glycolysis occurs / no Krebs / no link reaction;