In the Krebs cycle, how is citric acid formed? Enzymes combine hydrogen ions, oxygen, and electrons.

Pyruvic acid molecules are broken down by an acetyl group.

Carbon dioxide bonds with a chain of coenzyme A.

Acetyl-CoA joins with a large molecule called oxaloacetic acid.

2. which of the following statements does not accurately describe stem cells? a. embryonic stem cells make up the inner cell mass of a blastocyst. b. with more research, stem cells may be used to repair or replace damaged cells. c. the use of stem cells is without any objections since it can be used in therapies to humans. d. adult stem cells are multipotent and can differentiate into many types of cells.