DNA Structure and Replication – Section 3

11. The DNA is negatively supercoiled, complexes to histone,

A. HU
B. HSP-1
C. H-NS
D. All of these

Correct Answer: D. All of these

12. During conventional transformation experiments E. coli cells and plasmid DNA interacts in an environment of

A. high temperature and Ca++
B. low temperature and Ca++
C. high temperature and Mg++
D. low temperature and Mg++

Correct Answer: B. low temperature and Ca++

13. What is the exact name of the classical Watson-Crick double helix DNA?

A. A-DNA
B. B-DNA
C. Z-DNA
D. X-DNA

Correct Answer: B. B-DNA

14. The site on a bacterial chromosome that marks the initiation point for chromosome replication is called

A. Ori
B. a promoter
C. Pro
D. an initiation codon

Correct Answer: A. Ori

15. The B-DNA structure found in solution is a

A. left-handed double helix of antiparallel chains (10 bp/turn)
B. right-handed double helix of antiparallel chains (∼10 bp/turn)
C. left-handed zig-zag helix of antiparallel chains (10 bp/turn)
D. right-handed double helix of parallel chains (∼10 bp/turn)

Correct Answer: B. right-handed double helix of antiparallel chains (∼10 bp/turn)

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