MCQ Questions
Q.1.
In a nucleotide, the nitrogenous base is attached to the sugar's _____ carbon and the phosphate group is attached to the sugar's _____ carbon.
  • 0%
    1'...5'
  • 0%
    thymine...cytosine
  • 0%
    nuclease
  • 0%
    5' to 3'
Q.2.
After DNA replication is completed, _____.
  • 0%
    It exists as chromatin and is less condensed than mitotic chromosomes.
  • 0%
    Each new double helix consists of one old and one new strand.
  • 0%
    each new DNA double helix consists of one old DNA strand and one new DNA strand
  • 0%
    It untwists the double helix and separates the two DNA strands
Q.3.
The action of helicase creates _____.
  • 0%
    nucleotide excision repair
  • 0%
    RNA primer complementary to a preexisting DNA strand
  • 0%
    It untwists the double helix and separates the two DNA strands
  • 0%
    replication forks and replication bubbles
Q.4.
The first step in the replication of DNA is catalyzed by _____.
  • 0%
    nuclease
  • 0%
    template
  • 0%
    ligase
  • 0%
    helicase
Q.5.
In a DNA double helix an adenine of one strand always pairs with a(n) _____ of the complementary strand, and a guanine of one strand always pairs with a(n) _____ of the complementary strand.
  • 0%
    telomeres
  • 0%
    1'...5'
  • 0%
    thymine...cytosine
  • 0%
    template
Q.6.
In nucleotide excision repair, damaged DNA is excised by what enzyme(s)?
  • 0%
    template
  • 0%
    ligase
  • 0%
    helicase
  • 0%
    nuclease
Q.7.
The synthesis of a new strand begins with the synthesis of a(n) _____.
  • 0%
    DNA polymerase can assemble DNA only in the 5' to 3' direction
  • 0%
    DNA is usually double-stranded, whereas RNA is usually single-stranded.
  • 0%
    RNA primer complementary to a preexisting DNA strand
  • 0%
    Each new double helix consists of one old and one new strand.
Q.8.
What is the function of helicase in DNA replication?
  • 0%
    It exists as chromatin and is less condensed than mitotic chromosomes.
  • 0%
    DNA polymerase can assemble DNA only in the 5' to 3' direction
  • 0%
    DNA is usually double-stranded, whereas RNA is usually single-stranded.
  • 0%
    It untwists the double helix and separates the two DNA strands
Q.9.
DNA replication is said to be semiconservative. What does this mean?
  • 0%
    RNA primer complementary to a preexisting DNA strand
  • 0%
    It untwists the double helix and separates the two DNA strands
  • 0%
    Each new double helix consists of one old and one new strand.
  • 0%
    each new DNA double helix consists of one old DNA strand and one new DNA strand
Q.10.
Which of these is a difference between a DNA and an RNA molecule?
  • 0%
    DNA polymerase can assemble DNA only in the 5' to 3' direction
  • 0%
    It exists as chromatin and is less condensed than mitotic chromosomes.
  • 0%
    DNA is usually double-stranded, whereas RNA is usually single-stranded.
  • 0%
    thymine
Q.11.
Which of these nitrogenous bases is found in DNA but not in RNA?
  • 0%
    telomeres
  • 0%
    helicase
  • 0%
    thymine
  • 0%
    DNA is usually double-stranded, whereas RNA is usually single-stranded.