Practicing Success

Target Exam

CUET

Subject

Biology

Chapter

Molecular Basis of Inheritance

Question:

Select the correct statements from the following

A. The presence of Thymine at the place of Uracil gives more stability to DNA

B. Both nucleic acids, i.e. DNA and RNA mutate

C. DNA is dependent on RNA for synthesis of proteins

D. RNA mutate at slower rate than DNA

E. DNA is better genetic material

Choose the correct answer form the options given below:

Options:

A & D only

A & B only

A. B, C & D only

 A,B,C & E only

Correct Answer:

 A,B,C & E only

Explanation:

The correct answer is Option (4) - A,B,C & E only

DNA chemically is less reactive and structurally more stable when compared to RNA. Therefore, among the two nucleic acids, the DNA is a better genetic material.

In fact, the presence of thymine at the place of uracil also confers additional stability to DNA.  Both DNA and RNA are able to mutate. In fact, RNA being unstable, mutate at a faster rate. Consequently, viruses having RNA genome and having shorter life span mutate and evolve faster.

RNA can directly code for the synthesis of proteins, hence can easily express the characters. DNA, however, is dependent on RNA for synthesis of proteins.

The protein synthesising machinery has evolved around RNA.