Dna Mixed(Biochemistry > Dna ) Questions and Answers

Question 1. The chromosomal DNA complexes with
  1.    five types of histone as H1, H2A, H2B, H3 and H4
  2.    four types of histone as H1, H2A, H3 and H4
  3.    two types of histone as H1 and H4
  4.    three types of histone as H1, H2A and H4
Explanation:-
Answer: Option A. -> five types of histone as H1, H2A, H2B, H3 and H4
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.    Guanine
  3.    Cytosine
  4.    Uracil
Explanation:-
Answer: Option C. -> Cytosine
Question 3. The accepted hypothesis for DNA replication is
  1.    conservative theory
  2.    semi-conservative theory
  3.    evolutionary theory
  4.    dispersive theory
Explanation:-
Answer: Option B. -> semi-conservative theory
Question 4. Which is the largest among the followings?
  1.    Nucleotide
  2.    Carbon
  3.    Nitrogenous base
  4.    Phosphate
Explanation:-
Answer: Option A. -> Nucleotide
Question 5. Telomeres are usually rich in which nucleotide?
  1.    Adenine
  2.    Thymine
  3.    Guanine
  4.    Cytosine
Explanation:-
Answer: Option C. -> Guanine
Question 6. The most common liquid volumes in molecular biology are measured in
  1.    μl
  2.    ml
  3.    nl
  4.    1
Explanation:-
Answer: Option A. -> μl
Question 7. Messelsen and Stahl model of replication was called
  1.    dispersive replication
  2.    semi-conservative replication
  3.    conservative replication
  4.    Cri du Chat
Explanation:-
Answer: Option B. -> semi-conservative replication
Question 8. In DNA double helix, the two DNA chains are held together by
  1.    None of these
  2.    ionic bonds between the pair of bases
  3.    hydrogen bonds between the pair of bases
  4.    covalent bonds between the pair of bases
Explanation:-
Answer: Option C. -> hydrogen bonds between the pair of bases
Question 9. The 5' and 3' numbers are related to the
  1.    length of the DNA strand
  2.    the number of phosphates
  3.    the base pair rule
  4.    carbon number in sugar
Explanation:-
Answer: Option D. -> carbon number in sugar
Question 10. 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.    neither chromatid was labeled
  2.    only one chromatid of a chromosome was labeled
  3.    both chromatids of a chromosome were labeled
  4.    both (a) and (b)
Explanation:-
Answer: Option C. -> both chromatids of a chromosome were labeled
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