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6. which of the following statements best describes the distribution of 80S ribosomes in an eukaryotic cell?

  • attatched to the golgi apparatus
  • located in the cytoplasm and on the endoplasmic reticulum membrane
  • located in the nucleus
  • located in the endoplasmic reticulum lumen

7. The E.coli gene lacY encodes for which of the following proteins?

  • Beta-glactoside permease
  • Beta haemoglobin
  • Beta-galactosidase
  • Thiogalactoside transacetylase

8. Which of the following best describes a chemolithotropic organism?

  • An organism which obtains energy from the oxidation of sugars
  • An organism which obtains energy from the oxidation of organic chemicals
  • An organism which obtains energy from the oxidation of inorganic chemicals
  • An organism which obtains energy from light driven reactions

9. During DNA replication, Okazaki fragments are formed on

  • the lagging strand
  • neither the leading or lagging strands
  • the leading strand
  • both the leading and lagging strands

10. Which statement is correct?

  • polydenylation adds coding sequences to the mRNA
  • polydenylation occurs at the 5' end of mRNA molecule
  • polydenylation slows down the degradation of mRNA
  • polydenylation speeds up the degradation of mRNA

11. During cytoplasmic eukaryotic protein synthesis, the initiator tRNA molecule carries which of the following amino acids?

  • Proline
  • Methionine
  • Lysine
  • Tryptophan

12. Which of the following molecules are only found in bacterial cells?

  • Phosopholipid bilayer
  • Peptidoglycan
  • Chitin
  • Cellulose

13. Which of the following are not found in bacterial cells?

  • Golgi apparatus
  • Cell wall
  • Ribosomes
  • Flagella

14. Which enzyme removes short strands of RNA complimentary to the DNA sequence in DNA replication?

  • Primase
  • DNA polymerase 1
  • DNA polymerase 3
  • Helicase

15. With respect to the genes which encode mitochondrial proteins which of the following statements is true?

  • Mitochondrial proteins are not encoded by genes
  • Some genes are located in the mitochondrial DNA and some in the nuclear DNA
  • All genes are located in the mitochondrial DNA
  • All the genes are located in the nuclear DNA

16. The adaptive immune response can be activated by antigen presentation to T-helper cells by which of the following immune cells?

  • Cytotoxic T cells
  • Macrophage
  • Plasma cell
  • Mast cell

17. Which enzyme produces short strands of RNA complimentary to the DNA sequence in DNA replication?

  • Primase
  • Helicase
  • DNA polymerase 1
  • DNA polymerase 3

18. In a eukaryotic cell, which of the following statements best describes the arrangment of nuclear genes?

  • monocistronic
  • operon-based
  • polycistronic
  • multigenic

19. The transfer of electrons between the cytochrome bc-1 and cytochrome oxidase complexes of the eukaryotic electron transport chain is mediated by which of the following molecules?

  • Protons
  • Cytochrome c
  • Ubiquinone
  • Adenosine triphosphate

20. Which sequence correctly orders the evolution of the following biochemical reaction?

  • 1st anoxygenic photosynthesis, 2nd bacterial photosynthesis, 3rd aerobic respiration, 4th eukaryotic oxygenic photosynthesis
  • 1st bacterial oxygenic photosynthesis, 2nd eukaryotic oxygenic photosynthesis, 3rd anoxygenic photosynthesis, 4th aerobic respiration