Chapter 8 Quiz KEY PDF

Preview

Summary

Chapter 8 online quiz key for Dr. Sally Pyle's General Biology 150 course...

Description

Chapter 8 Quiz Answer Key Which of the following is an example of potential rather than kinetic energy? a) the muscle contractions of a person mowing grass b) a molecule of glucose c) light flashes emitted by a firefly d) a crawling beetle foraging for food e) water rushing over Niagara Falls Which of the following is TRUE for all exergonic reactions? a) The reactions are rapid. b) The reaction goes only in a forward direction: All reactants will be converted to products, but no products will be converted to reactants. c) The products have more total energy than the reactants. d) A net input of energy from the surroundings is required for the reactions to proceed. e) The reaction proceeds with a net release of free energy. Complete the following sentences about enzyme function: Enzymes speed reaction rates by ______ and lowering activation energy. Activation energies drop because enzymes stabilize _______. Enzyme specificity is a function of the active site's shape and the chemical properties of _______ at the active site. a) 1. orienting substrates; 2. the transition state; 3. R-groups b) 1. orienting substrates; 2. reaction products; 3. R-groups c) 1. orienting products; 2. the transition state; 3. R-groups d) 1. orienting substrates; 2. the transition state; 3. reaction products Which of the following is true of enzymes? a) Enzyme function is independent of physical and chemical environmental factors such as pH and temperature. b) Enzymes increase the rate of chemical reaction by providing activation energy to the substrate. c) Enzymes increase the rate of chemical reaction by lowering activation energy barriers. d) Enzyme function is increased if the 3-D structure or conformation of an enzyme is altered. When chemical, transport, or mechanical work is done by an organism, what happens to the heat generated? a) It is used to generate ADP from nucleotide precursors. b) It is transported to specific organs such as the brain. c) It is lost to the environment. d) It is used to store energy as more ATP. e) It is used to power yet more cellular work....