Question

Choose the TRUE statement below.

a. The 30nm fiber is the major form of euchromatin.

b. Helper protein would enhance the ability of TFIID to bind to the TATA box of the promoter.

c. Activator proteins bind to CpG island sequences and repressor proteins bind to enhancer sequences.

d. DNA that contains actively transcribed genes would most likely contain chromatin in theheterochromatin configuration.

e. All of the exons of a gene are always expressed in a functional protein.

Answer 1

The answer to the given question has been solved as under :

The correct option is : b) helper proteins enhance the ability of TFIID to bind to the TATA box of promoter.

Reason: For RNA POL II, the positioning factor is TFIID, which consists of TBP associated with upto 14 other subunits called TAFs (for TBP associated factors). TBP binds specifically to the TATA box with the help of helper proteins TAFs.

The rest are wrong because ;

a) The 30 nm fibre is the most condensed form of chromatin (heterochromatin)

c) Both activator and repressor protein bind at enhancer.

d) euchromatin contains actively transcribed genes

e) All of the exons of a gene might not be expressed in a functional protein.