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41.

Which of the following statement is true for viruses:

A.	They always have RNA	B.	They always have DNA
C.	They are only bacteriophage	D.	They multiply in host cells

42.

Prokaryotic Genetic System contains:

A.	DNA and histones	B.	DNA or histones
C.	Only DNA and no histones	D.	Neither DNA nor histones

43.

Viruses are:

A.	Unicellular	B.	Bicellular
C.	Multicellular	D.	None of these

44.

A Virion is:

A.	Outer covering of the virus	B.	Inactive particle - like form of virus
C.	DNA complex of the virus	D.	None of these

45.

Virion of a virus consists of:

A.	Caspid and DNA	B.	Caspid and both nucleic acids
C.	Caspid and RNA	D.	None of these

46.

Which of the following planets has conditions essential for life:

A.	Japiter	B.	Mars
C.	Venus	D.	Mercury

47.

Genetic system in prokaryotes and eukaryotes:

A.	Are similar and enclosed in the nuclei	B.	Dissimilar but enclosed in nuclei
C.	Differ in the fact that prokaryotes system lack histones	D.	Differ in several respects

48.

A Cell devoid of nuclear membrane and mitochondria will belong to:

A.	Bacteria	B.	Protozoans
C.	Sponges	D.	None of these

49.

Chemosynthetic bacteria are able to:

A.	Synthesize all their food	B.	Utilize radiant energy for preparation of food
C.	Perform both these functions	D.	Perform none of these functions

50.

Miller synthesized:

A.	Aminoacid	B.	Proteins
C.	Carbohydrates	D.	Vitamins