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Home Biochemistry DNA Structure and Replication Comments

  • Question
  • Proteins involved in opening a replication bubble are


  • Options
  • A. DNA helicases
  • B. single stranded binding proteins
  • C. ligase
  • D. DNA topoisomerase

  • Correct Answer
  • DNA topoisomerase 


  • DNA Structure and Replication problems


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    • 1. 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
    • 2. 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
    • 3. Which of the following enzyme adds complementary bases during replication?

    • Options
    • A. Helicase
    • B. Synthesase
    • C. Replicase
    • D. Polymerase
    • Discuss
    • 4. 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
    • 5. 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
    • 6. 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
    • 7. Telomeres are usually rich in which nucleotide?

    • Options
    • A. Adenine
    • B. Guanine
    • C. Thymine
    • D. Cytosine
    • Discuss
    • 8. DNA helicase is used to

    • Options
    • A. unwind the double helix
    • B. interact the double helix closely
    • C. break a phosphodiester bond in DNA strand
    • D. none of the above
    • Discuss
    • 9. DNAs when charged, migrate in a gel towards the

    • Options
    • A. positive pole
    • B. negative pole
    • C. will not migrate
    • D. none of these
    • Discuss
    • 10. The most common liquid volumes in molecular biology are measured in

    • Options
    • A. ml
    • B. ?l
    • C. nl
    • D. 1
    • Discuss


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