What is one reason why plants have accessory pigment molecules, like chlorophyll b and carotenoids?
A) to reflect more energy
B) to absorb energy in parts of the electromagnetic spectrum that chlorophyll a cannot
C) to give them different colors
D) because plants cannot make enough chlorophyll a for all of their energy needs
B
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Based on the fact that CO2 limits photosynthesis in some current environments, what might you conclude about the evolution of photosynthesis?
A. Photosynthesis evolved when environmental concentrations of CO2 were low. B. Photosynthesis evolved when environmental concentrations of CO2 were high. C. CO2 levels likely did not have a bearing on the evolution of photosynthesis. D. Photosynthesis evolved in a greenhouse.
What does an ABC transporter use to transport larger ions and molecules across the cell membrane?
a. ATP b. water c. porins d. signals e. tunnels
When the substrate is bound to the enzyme, the shape of the enzyme may change slightly, leading to
A. more possible products of the reaction B. more permanent binding through intimate total contact C. a greater supply of activation energy D. a great range of possible catalytic activities E. an induced fit
Burning wood is a reverse reaction of photosynthesis. What products are formed from burning wood?
A. carbon dioxide and water B. glucose and oxygen C. oxygen and carbon dioxide D. oxygen and water E. carbon dioxide and glucose