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

  • Chloroplasts

  • Lysosomes

  • Nuclei

  • Nuclei


B.

Lysosomes

All others except lysosomes have double membrane.

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Water-soluble pigments found in plant cell vacuoles are

  • chlorophylls

  • carotenoids

  • anthocyanins

  • anthocyanins


C.

anthocyanins

Anthocyanins are water soluble pigments and appear red, purple depending on pH. 

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

  • peptidoglycan

  • cellulose

  • hemicellulose

  • hemicellulose


D.

hemicellulose

Fungi cell wall is made of chitin. 

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

  • Polymer

  • Polypeptide

  • Okazaki's fragment

  • Okazaki's fragment


D.

Okazaki's fragment

A chain of ribosomes attaches to a single mRNA is called polysome or polyribosomes.

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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


B.

I is true but II is false

Mitochondria and chloroplast have DNA and are capable of self-replication, thus they are semi-autonomous bodies

The organelles do synthesize some of protein and hence they have the protein synthesizing machinery. However, most of the proteins are derived from the nucleus. 

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