Practicing Success

Target Exam

CUET

Subject

Biology

Chapter

Molecular Basis of Inheritance

Question:

Read the passage given below and answer the following question.
Deoxyribonucleic acid (DNA) and ribonucleic acid (RNA) are the two types of nucleic acids found in living systems. DNA acts as the genetic material in most of the organisms. RNA though it also acts as a genetic material in some viruses, mostly functions as a messenger. RNA has additional roles as well. It functions as adapter, structural, and in some cases as a catalytic molecule.The chemical structure of a polynucleotide chain (DNA or RNA). A nucleotide has three components – a nitrogenous base, a pentose sugar (ribose in case of RNA, and deoxyribose for DNA), and a phosphate group. There are two types of nitrogenous bases – Purines and Pyrimidines .

In which of the following organisms, RNA acts as a genetic material? (Question 5)

Options:

Escherichia coli

Tobacco Mosaic Virus

Both of the above

None of the above

Correct Answer:

Tobacco Mosaic Virus

Explanation:

The correct answer is option (2) -Tobacco Mosaic Virus

In the case of Escherichia coli (E. coli), DNA is the genetic material. E. coli is a bacterium, and like most bacteria, it contains DNA as its genetic material.

On the other hand, Tobacco Mosaic Virus (TMV) is an example of an organism in which RNA acts as the genetic material. TMV is a plant virus, and its genetic material is composed of RNA. TMV was one of the first viruses to be discovered, and its RNA genome plays a central role in the virus's ability to replicate and infect host cells.

So, the correct answer is: Tobacco Mosaic Virus.