A solution with a pH of 7 is
A) strongly acidic.
B) weakly acidic.
C) neutral.
D) weakly basic.
Answer: C
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Which of the following is not a mechanism to circumvent the limits imposed by diffusion?
A. placing metabolically active cells in the interior of an organism and metabolically inert structures along the exterior surface B. using vascular tissue to transport materials throughout the plant body C. placing metabolically active cells along a series of canals and pores D. using a circulatory system to distribute materials throughout the animal body E. All of these options are mechanisms to circumvent the limits of diffusion.
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.
The structure labeled "B" in the figure is a(n)
a. asexual spore. b. haploid spore. c. zygospore. d. gamete. e. spore sac
An example of both chemical protection and coevolution is seen in:
a. yellow goldenrod spiders and goldenrod. b. milkweeds and monarch caterpillars. c. the poison arrow frog and flying insects. d. coral animals and dinoflagellates. e. mycorrhizae.