Question

Assertion: DNA molecules and RNA molecules are found only in the nucleus of a cell.

Reason: On heating, the enzymes do not lose their specific activity.

(a) Both A and R are true and R is the correct explanation of A

(b) Both A and R are true but R is not correct explanation of A

(c) A is true but R is false

(d) A and R are false

Answer 1

The correct option is: (d)

Explanation:

In the cell, DNA molecules (i.e., deoxyribose nucleic acid) are present predominantly in the nucleus, some DNA is also present in the mitochondria in Eukaryotes. RNA molecules (i.e., ribose nucleic acid) are present in cytoplasm of the eukaryotes and in nucleus in some prokaryotes and virus. Enzymes lose their specific activity on heating.