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2396. An organelle involved in the transformation and turn over of membranes within a cell is

A. Endoplasmic reticulum

B. Nucleus

C. Plasma membrane

D. Golgi bodies

Explanation:

2397. Acid rain is caused due to pollution of atmosphere by

A. oxides of carbon and nitrogen

B. oxcides of nitrogen and sulphur

C. oxides of nitrogen and phosphorous

D. None of these

Explanation:

2398. Organisms at the base of the food chain are

A. photosynthetic plants

B. decomposers

C. carnivores

D. herbivores

Explanation:

2399. DNA molecule is a unique biological entity because it

A. forms a strand

B. forms a loop

C. is self replicating

D. is made of nucleotides

Explanation:

2400. At what stage of cell division does synapsis take place ?

A. Zygotene

B. Leptotene

C. Diplotene

D. Pachytene

Explanation:

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