Final answer:
A is false; amino acids in the protein interior can influence ligand binding through the protein's shape. B is false; antibodies consist of four polypeptide chains. C is false; ATPases hydrolyze ATP they do not synthesize it. D is true; hexokinase specifically phosphorylates one glucose stereoisomer.
Step-by-step explanation:
Indicate whether the following statements are true or false. If a statement is false, explain why it is false. Content loaded from the references indicates that:
- A. This statement is false. The amino acids in the interior of a protein do interact with the ligand to some extent and can play a role in selective binding, as their placement can affect the overall shape and stability of the protein's active site. Nonpolar amino acids tend to be in the interior, stabilizing the protein structure through hydrophobic interactions and sometimes van der Waals forces.
- B. This statement is false. Antibodies are Y-shaped molecules composed of four polypeptide chains, not six. They have two heavy chains and two light chains that are connected by disulfide linkages.
- C. This statement is false. ATPases do not generate ATP; rather, they hydrolyze ATP into ADP and inorganic phosphate, which releases energy used by the cell for various processes.
- D. This statement is true. Hexokinase is an enzyme that recognizes and phosphorylates glucose. It has a high specificity for its substrate, which usually allows it to phosphorylate only one of the glucose stereoisomers, primarily alpha-D-glucose.