Which of the following statements regarding viruses are...

Name: Problem 82, Chapter 2: Objective NCERT at your FINGERTIPS: Biology
Uploaded: 2021-11-07T10:34:49-08:00
Duration: 1 min 56 s
Channel: Aflah M
Description: Which of the following statements regarding viruses are correct? (i) These are cellular, infectious, nucleoprotien particles (ii) They can be grown in culture medium. (iii) Genetic material is either DNA or RNA, but never both. (iv) They can be crystallised. (a) (i) and (ii) (b) (ii) and (iii) (c) (iii) and (iv) (d) (i), (ii), (iii) and (iv)

Which of the following statements regarding viruses are correct? (i) These are cellular, infectious, nucleoprotien particles (ii) They can be grown in culture medium. (iii) Genetic material is either DNA or RNA, but never both. (iv) They can be crystallised. (a) (i) and (ii) (b) (ii) and (iii) (c) (iii) and (iv) (d) (i), (ii), (iii) and (iv)

Which of the following statements regarding viruses are correct?
(i) These are cellular, infectious, nucleoprotien particles
(ii) They can be grown in culture medium.
(iii) Genetic material is either DNA or RNA, but never both.
(iv) They can be crystallised.
(a) (i) and (ii)
(b) (ii) and (iii)
(c) (iii) and (iv)
(d) (i), (ii), (iii) and (iv)

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Key Concepts

Virus Structure and Composition

Viruses are acellular entities that consist of genetic material enclosed within a protein capsid. They are distinct from cells because they lack a cellular structure and do not carry out metabolic processes on their own.

Viral Replication and Culture Requirements

Viruses can only replicate inside host cells since they lack the machinery for independent reproduction. This dependency means that they cannot be grown on standard culture media like typical cellular organisms and require cell cultures or whole hosts for propagation.

Viral Genome Characteristics

The genetic material in viruses is either composed of DNA or RNA, but never both. This characteristic is a defining feature of viruses, setting them apart from many cellular organisms that may use both types of nucleic acids in various functions.

Virus Crystallization

Due to their uniform and repetitive structure, viruses can be crystallized under appropriate conditions. This process of crystallization is important for techniques such as X-ray crystallography, which are used to determine the detailed structural arrangement of viral particles.

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