NET Applied Sciences MCQs

DNA contains the five-carbon sugar deoxyribose.
RNA contains ribose instead.

Purines have a double-ring structure.
Adenine and guanine occur in both DNA and RNA.

DNA pyrimidines have single-ring structures.
They are cytosine and thymine.

Competitive inhibitors resemble or obstruct the substrate.
Their effect can often be reduced by increasing substrate concentration.

Plants store glucose mainly as starch.
It consists of amylose and amylopectin.

Noncompetitive binding changes enzyme shape or function.
Adding more substrate does not fully overcome it.

Cellulose consists of beta-glucose units.
Humans lack enzymes to digest its beta linkages.

Lipids include fats, phospholipids, steroids, and waxes.
They are hydrophobic or amphipathic.

Triglycerides are major energy-storage lipids.
They form through ester bonds.

Saturated fatty acids are fully saturated with hydrogen.
They are often solid at room temperature.

Double bonds introduce bends into fatty-acid chains.
They often increase membrane fluidity.

Phospholipids spontaneously form bilayers in water.
They are the main structural molecules of cell membranes.