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DNA Structure and Replication (Biochemistry) Question and Answers-Page first

DNA Structure and Replication problems


  • 1. Messelsen and Stahl model of replication was called

  • Options
  • A. conservative replication
  • B. semi-conservative replication
  • C. dispersive replication
  • D. Cri du Chat
  • Discuss
  • 2. Enzymes, responsible for unraveling short segments of DNA is

  • Options
  • A. DNA polymerase
  • B. helicase
  • C. DNA ligase
  • D. primase
  • Discuss
  • 3. In the study of one experiment it was found that the value of Tm for DNA is = 40° C. If the cell has 20% GC at the above Tm, then what will be value of 'Tm' if the GC% increases to 60%?

  • Options
  • A. Remains same
  • B. Increases
  • C. Decreases
  • D. Can not be compared
  • Discuss
  • 4. The higher order structure of DNA shows symmetry, whereas the higher order structures of most proteins do not. Why isn't protein shape more regular like DNA?

  • Options
  • A. DNA has one main function in cells whereas proteins have many.
  • B. The many different amino acid R groups on proteins confer many different shapes.
  • C. Some S amino acids cause proteins to bend; others cause protein to flatten.
  • D. All of the above
  • Discuss
  • 5. The 5' and 3' numbers are related to the

  • Options
  • A. length of the DNA strand
  • B. carbon number in sugar
  • C. the number of phosphates
  • D. the base pair rule
  • Discuss
  • 6. Which of the following enzyme adds complementary bases during replication?

  • Options
  • A. Helicase
  • B. Synthesase
  • C. Replicase
  • D. Polymerase
  • Discuss
  • 7. In DNA double helix, the two DNA chains are held together by

  • Options
  • A. covalent bonds between the pair of bases
  • B. hydrogen bonds between the pair of bases
  • C. ionic bonds between the pair of bases
  • D. none of the above
  • Discuss
  • 8. The chromosomal DNA complexes with

  • Options
  • A. three types of histone as H1, H2A and H4
  • B. five types of histone as H1, H2A, H2B, H3 and H4
  • C. four types of histone as H1, H2A, H3 and H4
  • D. two types of histone as H1 and H4
  • Discuss
  • 9. Proteins involved in opening a replication bubble are

  • Options
  • A. DNA helicases
  • B. single stranded binding proteins
  • C. ligase
  • D. DNA topoisomerase
  • Discuss
  • 10. When DNA polymerase is in contact with guanine in the parental strand, what does it add to the growing daughter strand?

  • Options
  • A. Phosphate
  • B. Cytosine
  • C. Uracil
  • D. Guanine
  • Discuss

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