Which of these is not found in a strand of DNA?
A) hydrogen bonds
B) a 5-carbon sugar
C) phosphate groups
D) nitrogen-containing bases
E) sterols
E) sterols
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Which one of the following cell types is found only in flowering plants?
A. vessels B. tracheids C. parenchyma D. sieve tubes E. epidermis
For a span of some 300 million years, the Paleozoic era, in which vascular plants, fishes, and other diverse life appeared, lasted approximately ___ of the geologic timescale.
A. 7% B. 15% C. None of the answer choices is correct. D. 50% E. 85%
As a consequence of repeated use of a drug, larger and larger doses of the drug may be necessary in order to achieve the same effect. This is a consequence of the development of:
A) sensitization B) tolerance C) withdrawal D) cross-tolerance
Energy derived from cellular respiration can originate from
a) carbohydrates only b) fats only c) proteins only d) carbohydrates and proteins only e) carbohydrates, proteins, and fats