Question

Ribonucleosides lack a

a) nitrogenous base.
b) 5′ phosphate group.
c) 3′ hydroxyl group.
d) 2′ hydroxyl group.
e) pentose sugar.

Answer 1

Ribonucleosides lack a 5′ phosphate group and consist of a nitrogenous base attached to the ribose sugar, but without the phosphate group found in ribonucleotides.

Step-by-step explanation:

Understanding Ribonucleosides The question relates to the structure of ribonucleosides. Specifically, ribonucleosides lack a 5′ phosphate group. The components of a ribonucleoside include a nitrogenous base attached to the 1' carbon of ribose, which is a pentose sugar, and they do not have a phosphate group attached. Ribonucleosides differ from ribonucleotides, which have one or more phosphate groups connected to the 5' carbon of the sugar.

Therefore, the correct answer to the question is: Ribonucleosides lack b) 5′ phosphate group. They do contain the nitrogenous base, the 3' hydroxyl group, the 2' hydroxyl group of ribose, and the pentose sugar itself.