Question

1. Why do polysaccharides make good energy storing molecules?

A. They maintain structural stability under extreme pH values

B. They have a large number of nonpolar covalent bonds which are associated with high potential energy

C. They have a large number of polar covalent bonds which are associated with high potential energy

D. They have a large number of non-covalent bonds which are associated with low potential energy

2. Because it can carry information and catalyze biochemical reactions, scientists believe that the first "living molecule" may have been

		carbohydrate
		lipid
		protein
		RNA

Answer 1

Ans1)C. They have a large number of polar covalent bonds which are associated with high potential energy

Explaination: carbohydrates have several hydroxy gp which are are responsible for hydrogen bonds and polar covalent bond ie glycosidic bond are high energy bond.

Ans2)RNA

Explaination: Acc to RNA world hypothesis RNA molecule is considered as first living molecule which catalyze the biochemical reaction and carry info. Example of RNA catalytic property is 23 srRNA.