Question 1

The correct order of name of four aldoses with configuration given below respectively is :

Accepted Answer

If  -OH  group is on the right-hand side to the last carbon with respect to the highest oxidised carbon at the top, it is called D-isomer and if it is on the left side, it is called L-isomer. So, the names of the compounds are D-erythrose, D-threose, L-erythrose, L-threose, respectively.Hence, option B is correct.

Question 2

The correct statement regarding RNA and DNA respectively is :

Accepted Answer

The sugar component in RNA is  ribose  and the sugar component in DNA is  2&#8242;&#8722;deoxyribose . RNA is ribose nucleic acid and DNA is 2'-deoxyribose nucleic acid.

Question 3

A non-proteinaceous enzyme is

Accepted Answer

(A) Correct option (D)(B) Explanation of correct answer:Ribozymes are RNA molecules that catalyze or autocatalyze sequence-specific cleavage. They are found in viruses, plants, and mammals and operate as RNA cutting enzymes. Ligases, deoxyribonucleases, lysozymes are proteinaceous enzymes i.e., made up of proteins while ribozymes has RNA as structural components.Enzymes are highly efficient catalytic macromolecules with variable activity.So, option (D) is the correct answer.

Biomolecules