NET Biology MCQs

One strand runs 5′ to 3′ and the other 3′ to 5′.
This orientation is important for replication enzymes.

DNA replication occurs before cell division.
Each daughter DNA molecule contains one old and one new strand.

ATP stores usable energy in phosphate bonds.
Hydrolysis of ATP powers many cellular processes.

Glycolysis breaks glucose into pyruvate.
It occurs in the cytosol and does not directly require oxygen.

Cellular respiration oxidizes fuel molecules.
Most ATP in aerobic cells is produced through oxidative phosphorylation.

The Krebs cycle oxidizes acetyl-CoA.
It produces reduced electron carriers and carbon dioxide.

Photosynthesis builds carbohydrates from carbon dioxide and water.
Light energy is captured by pigments such as chlorophyll.

DNA is a polymer made of nucleotides.
Each nucleotide contains a sugar, phosphate, and nitrogenous base.

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.