The difference between one amino acid and another is the:
A) number of R groups each contains.
B) way their amino groups bond with carboxyl groups.
C) type of R group each contains.
D) difference in the chemical properties of their amino and carboxyl groups.
E) number of amino and carboxyl groups each contains.
Answer: C
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Which of the following steps in prokaryotic binary fission is INCORRECT?
A. DNA is replicated bidirectionally from a single point on the circular chromosome. B. The two replicated chromosomes remain attached to the plasma membrane. C. The cell continues to grow outward symmetrically, separating the two chromosomes. D. Cell wall material is laid down at the midpoint to separate the two daughter cells. E. Construction of the plasma membrane and cell wall separates the two daughter cells.
Reptiles are better adapted to life on land than are amphibians. Which of the following statements best describes their advantage?
A. Reptiles have an egg with an amnion, yolk sac, allantois, chorion, and shell. B. Reptiles have a skin that resists loss of water by evaporation. C. Reptiles breathe by expanding the rib cage. D. Reptiles have the ability to concentrate urine. E. All the other choices provided are correct.
The continental crust is primarily comprised of all the following except:
a. granite-type rock. b. basalt-type rock. c. quarts-type rock. d. silicon-type rock. e. sedimentary rock.
The vector involved in African sleeping sickness is the
A. reduviid, "kissing," bug. B. phlebotomine (sand) fly. C. hard bodied tick. D. tsetse fly. E. Anopheles mosquito.