A town has several lakes connected by small streams or creeks. All the trout within a single lake is considered a ________________. The trout in all of the lakes constitutes a ________________
A. metapopulation; local population
B. local population; metapopulation
C. corridor population; metapopulation
D. metapopulation; corridor population
E. equilibrium population; corridor population
F. corridor population; equilibrium population
B
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C3 plants are more susceptible to photorespiration than either C4 or CAM plants. Why do most plants lack the C4
pathway?
a. Rubisco is more efficient in C3 plants when compared to rubisco of C4 and CAM plants. b. Photorespiration is not a serious problem for most plants. c. Most plant species do not have vacuoles in their cells to store the malate generated from CO2 taken in during the night. d. There is an energetic cost to C4 and CAM pathways that only makes them advantageous in very hot and/or arid environments. e. Switching between C3, C4, and CAM photosynthesis is very difficult for most plants.
The source of all carbon in living organisms is
A) simple sugars. B) carbon dioxide from atmosphere and water. C) carbon-fixing bacteria. D) sedimentary rocks.
The diagram shows the rate of diffusion into a cell using carrier proteins. 
McGraw-Hill EducationThe rate of diffusion will increase as
A. pH rises. B. the number of glucose molecules decreases. C. temperature decreases. D. the number of glucose molecules increases.
Which two enzymes catalyze the steps converting the toxic superoxide ion to less harmful oxygen gas?
A. superoxide dismutase and catalase B. catalase and hydrogen peroxidases C. superoxide dismutase and hydrogen peroxidase D. superoxide dismutase and oxidase E. catalase and oxidase