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741. A plasmid is

A. a component of the cell wall

B. a part of the plasma membrane

C. a vesicle full of digestive enzymes

D. an extra-chromosomal genetic element

Explanation:

742. Which of the following chemicals is used for preserving fruit juices ?

A. Ammonium sulphate

B. Sodium hydroxide

C. Sodium benzoate

D. Potassium nitrate

Explanation:

743. The most important ore of aluminium is

A. bauxite

B. calamine

C. calcite

D. galena

Explanation:

744. Light emmited by sun reaches earth in

A. 1 sec

B. 10 sec

C. 13 sec

D. 8 sec

Explanation:

745. Which of the following cell organelles functions as the power house of a living cell ?

A. Chloroplast

B. Mitochondria

C. Ribosome

D. Golgi apparatus

Explanation:

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