Chapter 5 Photosynthesis and Metabolism PRACTICE Test Questions With Complete Solutions

Which term most precisely describes the cellular process of breaking down large molecules into smaller ones? correct answer: catabolism Whenever energy is transformed, there is always an increase in the correct answer: entropy of the system Which of the following is an example of kinetic energy rather than potential energy? correct answer: light flashes emitted by a firefly Which of the following is true for all endergonic reactions? correct answer: the products have more total energy than the reactants Which of the following is true of enzymes? correct answer: enzymes increase the rate of chemical reaction by lowering activation energy barriers Where does the Calvin cycle take place? correct answer: stroma of the chloroplast In the thylakoid membranes, what is the main role of the pigment molecules in a light-harvesting complex? correct answer: transfer light energy to the reaction-center chlorophyll Which of the following events occurs in the light reactions of photosynthesis? correct answer: Light is absorbed and funneled to reaction-center chlorophyll a The reactions that produce molecular oxygen (O2) take place in correct answer: the light reactions alone What is the primary function of the Calvin cycle? correct answer: synthesize simple sugars from carbon dioxide The NADPH required for the Calvin cycle comes from correct answer: reactions initiated in photosystem I Reactions that require CO2 take place in correct answer: the Calvin cycle alone