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6. tRNA molecules have a triplet of bases responsible for bonding to specific amino acids

  • TRUE
  • FALSE

7. DNA is found in the nucleus, wound around histone proteins, but also in mitochondria

  • eukaryotes
  • prokaryotes

8. which base is purine and forms 3 hydrogen bonds

  • guanine
  • cytosine
  • adenine
  • thymine

9. What does Ligase do

  • it catalyses the formation of DNA from activated deoxyribose nucleotides, using single stranded DNA as a template
  • it catalyses the joining of the fragments of DNA produced from the lagging strand
  • it catalyses the breaking of hydrogen bonds between pairs of nitrogenous bases in a DNA molecule
  • it catalyses the untwisting of the DNA

10. The Genetic Code is:

  • Degenerate
  • all of them
  • Universal
  • Non-overlapping

11. Adenine + Thymine form ___ hydrogen bonds

  • 2
  • 3

12. The covalent bond between the sugar and the phosphate group in a nucleotide is a _______ bond

  • ester
  • phosphodiester
  • peptide
  • covalent

13. the bond between the deoxyribose molecule and the phosphate group is called a __________ bond

  • hydrogen
  • phosphodiester
  • peptide
  • ester

14. The purine bases are:

  • Adenine + Guanine
  • Cytosine, Uracil + Thymine

15. The pentose sugar for DNA is......

  • amylose
  • deoxyribose
  • ribose

16. A purine always bonds with a pyrimidine

  • TRUE
  • FALSE

17. RNA polymerase catalyses the formation of temporary H bonds between RNA nucleotides and the complementary DNA bases

  • True
  • False

18. What does Helicase do

  • it catalyses the breaking of hydrogen bonds between pairs of nitrogenous bases in a DNA molecule
  • it catalyses the formation of DNA from activated deoxyribose nucleotides, using single stranded DNA as a template
  • it catalyses the joining of the fragments of DNA produced from the lagging strand
  • it catalyses the untwisting of the DNA

19. DNA replicates via ______________ replication

  • dispersive
  • semi-conservative
  • conservative

20. DNA in prokaryotic cells is not wound around histone proteins, it is 'naked' DNA

  • True
  • False