Which one of the following cell organelles is enclosed by a single membrane?

• Chloroplasts

• Lysosomes

• Nuclei

• Nuclei

Mitochondria and choloroplast are :
I. semi-autonomous organelles.
II. formed by division of pre-existing  organelles and they contain DNA but lack protein synthesizing machinery. 

• II is true but I is false

• I is true but II is false

• Both I and II are false

• Both I and II are false

One of the major components of cell wall of most fungi is

• peptidoglycan

• cellulose

• hemicellulose

• hemicellulose

A complex of ribosomes attached to a single strand of RNA is known as 

• Polymer

• Polypeptide

• Okazaki's fragment

• Okazaki's fragment

Water-soluble pigments found in plant cell vacuoles are

• chlorophylls

• carotenoids

• anthocyanins

• anthocyanins