Free Biological Classification (Daily Quiz: 2) NEET Biology Questions & Answers with Detailed Explanation & Full Review

Question-1

T. O. Diener discovered a new infectious agent that was smaller than viruses and have the following characteristics.

1. It causes potato spindle tuber disease.
2. It has free RNA.
3. Molecular weight of RNA is low.

Identify the infections agent.

(a) Virion

(b) Viruses

(c) Viroids

(d) Mycoplasma

Question-2

The motile bacteria are able to move by

(a) flagella

(b) fimbriae

(c) cilia

(d) pili.

Question-3

Which of the following statements is incorrect?

(a) Viruses are obligate parasites.

(b) Prions consist of abnormally folded proteins.

(c) Viroids lack a protein coat.

(d) Infective constituent in viruses is the protein coat.

Question-4

Auxospores and hormogonia are formed, respectively, by

(a) several cyanobacteria and several diatoms

(b) some diatoms and several cyanobacteria

(c) some cyanobacteria and many diatoms

(d) several diatoms and a few cyanobacteria.

Question-5

Viruses have

(a) Single chromosome

(b) DNA enclosed in a protein coat

(c) Prokaryotic nucleus

(d) Both DNA and RNA