AQA A LEVEL BIOLOGY EXAM QUESTIONS WITH 100% CORRECTLY SOLVED ANSWERS

AQA A LEVEL BIOLOGY EXAM QUESTIONS WITH 100%
CORRECTLY SOLVED ANSWERS.


1) The Krebs cycle takes place in the _______ of the ___________ -- Answer ✔✔
t t t t t t t t t t t t t t




matrix mitochondria
t




2) Epistasis -- Answer ✔✔ arises when the allele of one gene affects or masks the
t t t t t t t t t t t t t t t




expression of another in the phenotype t t t t t




3) Autosome -- Answer ✔✔ a chromosome that is not a sex chromosome
t t t t t t t t t t t




4) Biodiversity -- Answer ✔✔ the range and variety of genes, species and habitats within
t t t t t t t t t t t t t t




a particular region
t t




5) Biomass -- Answer ✔✔ the total mass of living material, normally measured in a
t t t t t t t t t t t t t t




specific area over a given period of time
t t t t t t t




6) Intraspecific competition -- Answer ✔✔ competition between organisms of the same
t t t t t t t t t t t




species

7) Interspecific competition -- Answer ✔✔ competition between organisms of different
t t t t t t t t t t




species

8) Krebs cycle -- Answer ✔✔ series of aerobic biochemical reactions in the matrix of
t t t t t t t t t t t t t t




the mitochondria of most eukaryotic cells by which energy is obtained through the
t t t t t t t t t t t t t




oxidation of acetyl coenzyme A produced from the breakdown of glucose
t t t t t t t t t t




9) Meiosis -- Answer ✔✔ the type of nuclear division in which the number of
t t t t t t t t t t t t t t




chromosomes is halved t t