Question

Which of these viruses have as ssRNA?
A. $\phi \times 174$
B. ${T_2}$ bacteriophage
C. Pox virus
D. TMV

Answer 1

Hint: RNA: It is known as Ribonucleic acid.
 It is very essential in various biological coding, decoding, regulation & expression of genes.
This nucleic acid is usually single-stranded RNA (ssRNA) but may be double-stranded RNA (dsRNA).

Complete answer:
RNA: It is known as Ribonucleic acid.
It is very essential in various biological coding, decoding, regulation & expression of genes.
It is a single stranded RNA; strand has a backbone made up of ribose and phosphate groups.
RNA is found in the cytoplasm of the living cell but is mainly synthesized in the nucleus of the cell.
RNA consists of four nitrogenous bases:
1) Adenine
2) Guanine
3) Cytosine
4) Uracil
${T_2}$ Bacteriophage: It is a virus that infects and kills e.coli.
Its genome consists of linear double stranded RNA.
Pox virus: Poxviruses are brick or oval-shaped viruses with large double-stranded DNA genomes.
Poxvirus infections typically result in the formation of lesions, skin nodules, or disseminated rash.
TMV: Tobacco mosaic virus (TMV) is a positive sense single stranded RNA virus that infects tobacco and other members of the family Solanaceae.
Tobacco mosaic virus has a rod-like appearance.
Its capsid is made from 2130 molecules of coat protein and one molecule of genomic single strand RNA made of 6400 bases.

So, the correct option is option D. TMV.

Note: VDNA: It is deoxyribonucleic acid.
It is composed of two polynucleotide chains that coils together to form a double helical structure.
It is present inside the nucleus of the living cell, but a small amount of DNA is found in mitochondria also.
DNA helps in replication, encoding information, mutation and recombination and gene expression.
It carries the genetic information for development, functioning, reproduction of the organism.