Question

q1. which best explains how high temperatures affect enzymes and substrates? a. high temps. increase the substrate concen - tration and cause enzymes to be produced b. high temperatures unfold the substrate and allow enzymes to combine with them c. high temperatures denature enzymes and stop them from combining with substrates d. high temps. activate the enzymes and allow additional substrates to be attracted to them q2. most enzyme - assisted reactions are a. reversible b. able to take place at any temperature c. exothermic d. endothermic q3. a poison is bonded to the active site of an enzyme. which function is the enzyme most likely unable to perform because of the attachment of the poison molecule? a. the release of stored chemical energy b. the catalysis of the reaction with the substrate c. the supply of activation energy for a reaction d. the donation of electrons to the substrate q4. enzymes are not consumed in chemical reactions. what does this mean? a. enzymes are not denatured b. enzymes are not used up in a reaction c. enzymes can continue to be used in many reactions d. all of the above

Explanation:

• Question 1: High temperatures cause enzymes to unfold (denature), which stops them from combining with substrates. So the answer is related to denaturation due to high - temps.
• Question 2: Enzymes are catalysts in chemical reactions and are not consumed in the reactions they assist.
• Question 3: When a poison binds to the active site of an enzyme, the enzyme is unable to perform its function because the attachment of the substrate is blocked.
• Question 4: All of the statements about enzymes (not being denatured, not being used up, and being reusable) are correct.

Answer:

• Q1: C. High temperatures denature enzymes and stop them from combining with substrates
• Q2: A. Reversible
• Q3: A. The attachment of the poison molecule prevents the enzyme from performing its function because of the storage of chemical energy with the substrate
• Q4: D. All of the above