Question

Which of the following options below depicts two main differences between RNA & DNA?
A.ribose sugar & thymine in RNA
B.deoxyribose sugar & uracil in DNA
C.ribose sugar & uracil in RNA
D.deoxyribose sugar & guanine in DNA

Answer 1

Hint:In RNA, uracil binds to adenine via two hydrogen bonds. In DNA, the uracil nucleobase is replaced by thymine. Uracil is a demethylated form of thymine.

Complete step by step answer:
We know that RNA is a polymer with a ribose and phosphate backbone and four different bases: adenine, guanine, cytosine and uracil. But in DNA ,uracil is replaced by thymine. RNA stands for ribonucleic acid & DNA stands for deoxyribonucleic acid. As the name also suggests, RNA contains ribose sugar & DNA contains deoxyribose sugar. Deoxyribose lacks just one oxygen atom in its structure. Otherwise both their structures are the same.
Structure:-

Also, RNA has the nucleobase uracil while DNA has nucleobase thymine. Uracil is a demethylated form of thymine.
Structure:-

∴ Correct option is C- Ribose sugar & uracil in RNA

Note:
-DNA and RNA are two main types of nucleic acids. They perform different functions in the human body. DNA stores & transmits genetic information while RNA acts as a template for making proteins. DNA provides the code for the cell’s activities, while RNA converts that code into proteins to carry out cellular functions.