Question

RNA molecule has two ends called as

• A. 3' and 5' end
• B. N terminal and C terminal
• C. Reducing and non-reducing ends
• D. Antiparallel ends

Answer 1

The correct option is A 3' and 5' end

DNA and RNA are polymers of nucleotides in which 5' phosphate group of one nucleotide unit is joined to the 3'-hydroxyl group of the next nucleotide (phosphodiester linkage) giving the polymer chain distinct polarity. The 3' end has free hydroxyl group and 5' end has free phosphate group. DNA is a double helix structure with two strands that run parallel to each other in opposite polarity. Hence, 3' end of one strand is present parallel to 5' end of other strand and vice versa. RNA is a single stranded polymer of ribonucleotides joined by phosphodiester linkage and hence, has 3' and 5' ends. Correct option is A.