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6. How many molecules of ATP are formed in the Krebs cycle?

  • 3
  • 1
  • 2
  • 4

7. Where does the light dependent stage take place?

  • chlorophyll
  • thylakoids
  • mitochondria
  • stroma

8. What must happen during speciation for the gene pools to become different?

  • The environment must change.
  • A mutation must occur.
  • A mutation must be selected for by the environment.
  • Reproductive isolation.

9. Intraspecific competition is...

  • between the same species
  • between different species

10. What genetic diseases most often result in males being affected while women can be carriers?

  • Sex linked genes (to the X chromosome)
  • Sex linked genes (to the Y chromosome)
  • Dominant genes
  • Recessive genes

11. How many ATP molecules are produced at the end of glycolysis?

  • 0
  • 2
  • 4
  • 6

12. What organism helps the process of nitrogen in the atmosphere become ammonia?

  • Nitrifying bacteria
  • Saprophytes
  • Nitrogen fixing bacteria
  • Denitrifying bacteria

13. Acetyl CoA combines with what molecule to form a 6C molecule?

  • 5C
  • 4C
  • 2C
  • 3C

14. Which of these is a feature of intensive rearing?

  • High protein food
  • Warm environment
  • All of these
  • Restricted movement

15. What does directional selection do?

  • Change the characteristics of a population
  • Preserve the characteristics of a population

16. Which of these in an effect of using nitrogen-containing fertilisers?

  • eutrophication
  • All 3
  • leaching
  • reduced species diversity

17. Where does the link reaction take place?

  • matrix
  • cytoplasm
  • cristae