Match the structures given in Column-I with the appropriate characteristics given in column- II.

	Column - I		Column - II
a)	Glycocalyx	i)	Present in the form of vesicles, tubules and lamellae
b)	Plasmid	ii)	Proteinaceous structure on bacterial surface
c)	Mesosomes	iii)	Exist either as slime layer or capsule
d)	Pili	iv)	Confer antibiotic resistance to bacteria

	a	b	c	d
1.	i	iii	iv	ii
2.	iii	iv	i	ii
3.	iv	i	ii	iii
4.	ii	iii	iv	i

Glycocalyx is the outer most layer of the cell envelope. When it is loose sheath it is called slime layer while when it is thick and tough it is called capsule. Plasmid is the extra genetic material found in prokaryotes. It confers antibiotic resistance to bacteria. Mesosomes are the invaginations of the plasma membrane. They may be in the form of vesicles, tubules and lamellae. Pili are tubular structure found on the surface of bacteria. They are made up of pilin protein.