Examine Figure 18.5. Which of the following species would you characterize as restricted to nonserpentine soils in southwestern Oregon?
A) black oak
B) hawkweed
C) ragwort
D) fireweed
Ans: A) black oak
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Cyanobacteria are prokaryotes that carry out oxygenic photosynthesis like green plants; this means that
A. they produce oxygen as a by-product of photosynthesis. B. they have two distinct photosystems. C. they use water as their electron source. D. All of the choices are correct.
If the sequence of bases in mRNA is U, C, A, the sequence of bases in DNA is
A. A, G, and U. B. A, G, and T. C. A, C, and A. D. T, G, and U.
Active transport involves all of the following except the
A) diffusion of solute through the lipid bilayer of a membrane. B) pumping of solutes across the membrane. C) hydrolysis of ATP. D) transport of solute against a concentration gradient. E) specific transport protein in the membrane.
Mutations in the proto-oncogene ras and the tumor-suppressor gene p53
A) increase protein synthesis by the cell. B) can improve the chance of avoiding cancer as one ages. C) can enhance further mutations, which can develop into cancer. D) disrupt normal regulation of the cell cycle.