Dna Structure And Replication(Biochemistry ) Questions and Answers

Question 1.  The accepted hypothesis for DNA replication is
  1.    conservative theory
  2.    dispersive theory
  3.    semi-conservative theory
  4.    evolutionary theory
Explanation:-
Answer: Option C. -> semi-conservative theory
Question 2.  When DNA polymerase is in contact with guanine in the parental strand, what does it add to the growing daughter strand?
  1.    Phosphate
  2.    Cytosine
  3.    Uracil
  4.    Guanine
Explanation:-
Answer: Option B. -> Cytosine
Question 3.  Telomeres are usually rich in which nucleotide?
  1.    Adenine
  2.    Guanine
  3.    Thymine
  4.    Cytosine
Explanation:-
Answer: Option B. -> Guanine
Question 4.  The chromosomal DNA complexes with
  1.    three types of histone as H1, H2A and H4
  2.    five types of histone as H1, H2A, H2B, H3 and H4
  3.    four types of histone as H1, H2A, H3 and H4
  4.    two types of histone as H1 and H4
Explanation:-
Answer: Option B. -> five types of histone as H1, H2A, H2B, H3 and H4
Question 5.  Taylor, Woods and Hughes labeled Vicia DNA by allowing new DNA synthesis in the presence of radioactive thymine. After DNA replication (S phase of the cell cycle), it was observed that
  1.    only one chromatid of a chromosome was labeled
  2.    both chromatids of a chromosome were labeled
  3.    both (a) and (b)
  4.    neither chromatid was labeled
Explanation:-
Answer: Option B. -> both chromatids of a chromosome were labeled
Question 6.  Which is the largest among the followings?
  1.    Nucleotide
  2.    Nitrogenous base
  3.    Phosphate
  4.    Carbon
Explanation:-
Answer: Option A. -> Nucleotide
Question 7.  In DNA double helix, the two DNA chains are held together by
  1.    covalent bonds between the pair of bases
  2.    hydrogen bonds between the pair of bases
  3.    ionic bonds between the pair of bases
  4.    none of the above
Explanation:-
Answer: Option B. -> hydrogen bonds between the pair of bases
Question 8.  The 5' and 3' numbers are related to the
  1.    length of the DNA strand
  2.    carbon number in sugar
  3.    the number of phosphates
  4.    the base pair rule
Explanation:-
Answer: Option B. -> carbon number in sugar
Question 9. . The most common liquid volumes in molecular biology are measured in
  1.    ml
  2.    μl
  3.    nl
  4.    1
Explanation:-
Answer: Option B. -> μl
Question 10.  Messelsen and Stahl model of replication was called
  1.    conservative replication
  2.    semi-conservative replication
  3.    dispersive replication
  4.    Cri du Chat
Explanation:-
Answer: Option B. -> semi-conservative replication
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