Question

Both deoxyribose and ribose belong to a class of sugars called ______.

Options

• trioses

• pentoses

• hexoses

• heptoses

Answer 1

Both deoxyribose and ribose belong to a class of sugars called pentoses.

Explanation:

This is based on the semiconservative model of replication. In the first generation after the switch, every DNA molecule is a hybrid, containing one original heavy strand and one new light strand. When these hybrids replicate a second time in light nitrogen, the “light” strands from the first generation act as templates to create the very first light/light DNA molecules. Therefore, while the first generation only produces hybrids, the second generation is when the fully light DNA finally appears.