Question

Which statement is true?

A. A disaccharide consists of a sugar covalently linked to another molecule such as an amino acid or a nucleotide.
B. Amino acids are often linked together to form branching polymers.
C. The presence of double bonds in the hydrocarbon of a fatty acid does not greatly influence its structure.
D. ATP can by hydrolyzed to release energy to power hundreds of reactions in cells.
E. DNA, unlike RNA, had 5' to 3' directionality.

Answer 1

The true statement is D. ATP can be hydrolyzed to release energy to power hundreds of reactions in cells, which is a fundamental process for various cellular functions.

Step-by-step explanation:

Among the given statements, the one that is true is:

D. ATP can be hydrolyzed to release energy to power hundreds of reactions in cells.

This statement is accurate because ATP (adenosine triphosphate) acts as the energy currency of the cell. When ATP is hydrolyzed, it is broken down into ADP (adenosine diphosphate) and an inorganic phosphate group, releasing energy that can be used to power various cellular processes. This process of energy release is vital for functions such as muscle contraction, active transport, and many other biochemical reactions within cells.

Regarding other statements, disaccharides consist of two monosaccharides covalently bonded by glycosidic bonds, not sugars linked to other types of molecules. Amino acids form linear polymers known as proteins and not commonly branching ones, although branching can occur within protein structures due to side chain interactions. The presence of double bonds in a fatty acid can dramatically affect its structure by introducing kinks that prevent tight packing, influencing the fluidity of cell membranes. Lastly, both DNA and RNA have 5' to 3' directionality. So statement D is the only correct answer.