A. Which of the following distinguishes conjugation from transduction? (1) Conju

Question

A. Which of the following distinguishes conjugation from transduction?
(1) Conjugation transfers large chromosome fragments. Small chromosome fragments are transferred in transduction.
(2) In conjugation, a true zygotic cell forms. No zygote is formed in transduction.
(3) In transduction, the donor DNA is transferred by a bacteriophage. In conjugation, DNA from the donor is transferred after cell-to-cell fusion.
(4) Recombination only occurs in transduction; in conjugation a diploid cell forms.
(5) All the above
(6) Answers (1) and (3)
(7) Answers (1), (2), and (4)

B. Which of the following is responsible for the presence of chromosomal DNA in a transducing bacteriophage?
(1) Lysis of the donor cell releases DNA which can be taken up by the recipient cell
(2) The presence of the F-plasmid in the recipient cell
(3) Mistakes in packaging bacteriophage DNA; chromosomal and not bacteriophage DNA is packaged in a bacteriophage head
(4) Recombination between the bacteriophage and chromosomal DNA
(5) None of the above

C. A sample of human DNA is made single stranded (denatured) and then the single stranded DNA is renatured. What fraction of the DNA would form double stranded DNA first?
(1) Highly repeated DNA
(2) Moderately repeated DNA
(3) Unique copy DNA

Explanation / Answer

A: (6) Answers (1) and (3) B: 3 Mistakes in packaging bacteriophage DNA; chromosomal and not bacteriophage DNA is packaged in a bacteriophage head C : (1) Highly repeated DNA

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