Question

Consider the following statements and select the options stating which ones are True (T) and which ones are False (F).

i. Monocistronic gene carries information for the synthesis of one polypeptide chain

ii. Polycistronic genes are mostly found in eukaryotes

iii. Promoter is located upstream of the structural gene i.e., towards 5' end of coding strand

iv. The TATA box is also called Hogness box in prokaryotes.

• A. i- T; ii – T; iii – F, iv – F
• B. i- T; ii – F; iii – T, iv – F
• C. i- F; ii – F; iii – T, iv – F
• D. i- T; ii – F; iii – F, iv – F

Answer 1

The correct option is B i- T; ii – F; iii – T, iv – F

Monocistronic gene is made up of only one cistron. It carries information for synthesis of one polypeptide chain and it is mostly found in eukaryotes.

Promoter is a region on DNA molecule to which an RNA polymerase binds and initiates transcription. Promoter is located upstream (to the left) of the structural gene, i.e., towards the 5' end of coding strand, 3' end of template strand.

Promoter is a region on DNA molecules to which an RNA polymerase binds and initiates transcription. Promotor has the sequence TATAAT, hence it is known as TATA box. TATA box is also called Pribnow box (after its discoverer Pribnow) in prokaryotes and Hogness box (after its discoverer Hogness) in eukaryotes.