Following statements were made about transposons:

A. Transposons have inverted terminal repeats and their integration generates inverted repeats at the flanks of the target site in the host genome.

B. A composite transposon can transpose as a unit.

C. The transposition event may cause deletions or inversions or move a host sequence to a new location.

D. The transposition event may cause deletions or inversions but cannot move a host sequence to a new location.

E. Replicative transposition proceeds through cointegration.

Which one of the following represents the combination of the correct statements?

#Question id: 2829

#Unit 2. Cellular Organization

Scaffold-associated regions

a. are the chromosome attachment points for the mitotic spindle.

b. can insulate transcription units from each other.

c. are the points at which DNA interacts with histone proteins.

d. are found between transcription units.

#Question id: 2830

#Unit 2. Cellular Organization

#Question id: 2831

#Unit 2. Cellular Organization

Specific DNA control elements in promoters can

a. interact with general transcription factors.

b. interact with repressor proteins.                 

c. interact with activator proteins.

d. remain unavailable because of condensed chromatin. 

#Question id: 2832

#Unit 2. Cellular Organization

Reporter genes are used to

a. express enzymes that are not easily assayed in cell extracts.

b. express enzymes that are easily assayed in cell extracts.

c. characterize DNA control elements.                     

d. characterize reporter plasmids.

#Question id: 2835

#Unit 2. Cellular Organization

An enhancer

a. can be located upstream of a promoter.

b. can be located downstream of a promoter.

c. can be located a variable distance from the promoter.

d. is always located within 1 kb of the promoter.

e. can be cell-type-specific.

#Question id: 2836

#Unit 2. Cellular Organization