Question

1. waters ability to act as a universal solvent is due to what property? a) high heat capacity b) cohesion and adhesion c) polarity d) density anomaly 15. what are the reactants for photosynthesis? a) sugar and oxygen b) sunlight, water, and carbon dioxide c) sugar and atp d) carbon dioxide, water, and atp 16. which of the following is true about anabolic pathways? a) they release stored chemical energy. b) they build complex molecules from simple ones. c) they take place primarily in skeletal muscle. d) they make large quantities of atp. 17. which of the following is true about exergonic reactions? a) they consume energy. b) the products have more free energy than the reactants. c) they are usually spontaneous. d) they build up complex molecules. 18. in a chemical reaction, what is the role of the enzymes active site? a) to bind to a molecule to be broken down. b) to bind to the products of the reaction. c) to release the enzyme after the reaction. d) to store energy for the reaction. 19. what is a key characteristic of the second law of thermodynamics?

Explanation:

1. Water is a polar molecule. Its polarity allows it to interact with a wide - range of substances, making it a good solvent. High heat capacity, cohesion - adhesion, and density anomaly are not related to its solvent ability.
2. Photosynthesis is the process by which plants use sunlight, carbon dioxide, and water to produce sugar and oxygen. So the reactants are sunlight, water, and carbon dioxide.
3. Anabolic pathways are biosynthetic pathways that build complex molecules from simple ones, such as the synthesis of proteins from amino acids. They require energy input rather than releasing it. They do not occur primarily in skeletal muscle and do not directly make large quantities of ATP.
4. Exergonic reactions release free energy. The products have less free energy than the reactants. They are usually spontaneous as they proceed without an external energy source. They do not build up complex molecules (that's anabolism).
5. The active site of an enzyme binds to the substrate (the molecule to be broken down or modified in the reaction), facilitating the chemical reaction. It does not bind to products, release the enzyme after the reaction, or store energy for the reaction.

Answer:

1. c) Polarity
2. b) Sunlight, water, and carbon dioxide
3. b) They build complex molecules from simple ones.
4. c) They are usually spontaneous.
5. a) To bind to a molecule to be broken down.