Which of the following is a large organic molecule that is NOT assembled by polymerization of a few kinds of simple subunits?
A) a steroid
B) cellulose
C) DNA
D) an enzyme
E) a contractile protein
Answer: A
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Which of the following activities in the roots does not require energy?
A. transport of solutes into the cytoplasm B. making specific nutrients in the soil available to the root C. supporting symbiotic relationships with soil microorganisms D. absorbing water into the root hair E. All root activities require energy.
The phylogenetic species concept (PSC) declares that a group is a species if it
A. is reproductively isolated from other species. B. has evolved one or more of its own derived characters. C. looks different than other species. D. is allopatric. E. has no synapomorphies.
Of the following molecules, which passes through a lipid bilayer most readily?
A. carbon dioxide B. glucose C. K+ D. arginine E. RNA
When chemoreceptors detect a slight decrease in pH, this means that ____ concentrations have increased, and the
breathing rate must ____. a. carbon dioxide; increase b. carbon dioxide; decrease c. oxygen; increase d. oxygen; decrease e. chloride; decrease