The two subunits of ribosomes remain united at critical ion level of _______.

(a)

Magnesium

(b)

Calcium

(c)

Sodium

(d)

Ferrous

Sequences of which of the following is used to know the phylogeny.

(a)

mRNA

(b)

rRNA

(c)

tRNA

(d)

HnRNA

Many cells function properly and divide mitotically even though they do not have.

(a)

plasma membrane

(b)

cytoskeleton

(c)

mitochondria

(d)

plastids

Keeping in view the fluid mosaic model for the structure of cell membrane which one of the following statements is correct with respect to the movement of lipids and proteins from one lipid monolayer to the other.

(a)

Neither lipid nor proteins can flip-flop

(b)

Both lipid and proteins can flip flop

(c)

While lipids can rarely flip-flop proteins cannot

(d)

While proteins can flip-flop lipids cannot

Match the columns and identify the correct option:

	Column I		Column II
A	Thylakoids	1.	Disc-shaped sacs in Golgi apparatus
B.	Cristae	2.	Condensed structure of DNA
C.	Cisternae	3.	Flat membranous sacs in stroma
D	Chromatin	4.	Infoldings in mitochondria

(a)

A	B	C	D
(iii)	(iv)	(ii)	(i)

(b)

A	B	C	D
(iv)	(iii)	(i)	(ii)

(c)

A	B	C	D
(iii)	(iv)	(i)	(ii)

(d)

A	B	C	D
(iii)	(i)	(iv)	(ii)