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21.

Unusual method of DNA duplication is called:

A.	Semiconservative	B.	Nonconservative
C.	Conservative	D.	None of these

22.

Mutations are harmful:

A.	Always	B.	Never
C.	Rarely	D.	Mostly

23.

A zygote has which of these number of chromosomes:

A.	x	B.	2x
C.	3x	D.	4x

24.

In chromosomes the material controlling heredity is:

A.	Histones	B.	DNA
C.	Chromocentres	D.	RNA

25.

Nuclein from nuclei of pus cells was separated by:

A.	Miescher	B.	Sutton
C.	Altmann	D.	None of these

26.

Chromosomal theory of inheritance was given by:

A.	Sutton	B.	Altmann
C.	Miescher	D.	All of these

27.

Spacer in chromosomes is associated with:

A.	H1	B.	H3
C.	H2a	D.	None of these

28.

Sperms do not have histones but they have

A.	A basic protein protamine	B.	Acid protein spermin
C.	Acid protein protamine	D.	None of these

29.

Which of these do not code for proteins:

A.	Operator	B.	Promotor
C.	Both (a) & (b)	D.	None of these

30.

An operon is constituted by:

A.	Operator genes	B.	Promotor genes
C.	Regulator genes	D.	All of these