Which of the blood vessels in the human cardiovascular system contain deoxygenated blood?
A) A only
B) A and C
C) C only
D) B, D, and E
E) D and E
B
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In the hypothesis that C. stellatus (a species of barnacle) is competitively excluded from the lower intertidal zone by B. balanoides (another species of barnacle), what could be concluded about the two species?
A) The fundamental and realized niches of B. balanoides and C. stellatus are identical. B) The fundamental and realized niches of B. balanoides and C. stellatus are different. C) The fundamental and realized niches of B. balanoides are different, but the fundamental and realized niches of C. stellatus are identical. D) The fundamental and realized niches of B. balanoides are identical, but the fundamental and realized niches of C. stellatus are different.
A sample of muscle tissue shows large-diameter fibers that are white in color. Which of the following characteristics would also be associated with this tissue?
A. high rates of ATP hydrolysis B. greater resistance to fatigue C. aerobic respiration D. abundant mitochondria E. All of the answer options are correct.
Of all organisms, prokaryotes are
a. the smallest. b. the most abundant. c. the most metabolically diverse. d. the most widespread. e. all of these.
The double-stranded DNA molecule can be described as a twisted rope ladder. What component of DNA would be like the steps of the ladder?
A) DNA polymerase B) nitrogenous bases C) phosphate groups D) sugar (deoxyribose) molecules