ATI TEAS 7 Version 1 Science

Correct Answer: D

Rationale: Osteocytes are the cells responsible for maintaining bone tissue and secreting bone material, contributing to the overall structure and strength of bones.

Correct Answer: A

Rationale: The correct answer is A, the pulmonary vein. The pulmonary vein carries oxygenated blood from the lungs back to the heart. It is crucial to differentiate between the pulmonary vein, which carries oxygenated blood, and the pulmonary artery, which carries deoxygenated blood. This understanding is fundamental in comprehending the flow of oxygen-rich and oxygen-poor blood within the cardiovascular system.

Correct Answer: B

Rationale: Totipotent cells possess the remarkable ability to differentiate into any cell type in the body, encompassing both embryonic and extraembryonic cell varieties. This quality is crucial in the early stages of embryonic development, facilitating the generation of all cell lineages and tissues. Unlike pluripotent or multipotent cells, totipotent cells exhibit the most extensive differentiation potential, playing a vital role in the organism's development from a single fertilized egg cell.

Correct Answer: D

Rationale: Proteins are composed of amino acids, which contain both an amine (NH2) and a carboxyl (COOH) functional group. The amine group is found at one end of the amino acid molecule, while the carboxyl group is located at the other end. When amino acids join together through peptide bonds, the amine of one amino acid reacts with the carboxyl group of another, forming a protein chain. Therefore, the correct answer is proteins.