Question

Which of the following is true about viruses?

• A. They are parasitic.
• B. They have no nuclei.
• C. They can hold either DNA or RNA.
• D. All of the above.

Answer 1

The correct option is D All of the above.

Viruses are obligate intracellular parasites as they lack the means for self-reproduction outside a host cell, but unlike parasites, viruses are generally not considered to be true living organisms. They are referred to as viral particles which are inactive outside an living host.
Viruses are constituted by genetic material (DNA or RNA) enwrapped by a protein capsule. They do not have membranes and cell organelles.