The most radiosensitive macromolecule is _____.
a) protein
b) DNA
c) mRNA
d) tRNA
Ans: b) DNA
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The Latin phrase omnis cellula e cellula refers to a cellular principle. Which of the following statements is the best translation of this phrase?
A) Tissues are composed of similar cells. B) Cells generally are found in clusters. C) All cells arise only from preexisting cells. D) Organs are composed of tissues and cells. E) The cell is the basic unit of structure.
The difference between living and nonliving matter depends not only on the kinds of atoms and molecules present, but
on their ____ as well.
a. chemical complexity b. electrons c. organization and interactions d. atomic profile e. energy levels
During which part of the bird respiratory cycle is O2 NOT extracted from the air?
a. the first inhalation b. the first exhalation c. the second inhalation d. the second exhalation e. the third exhalation
The presence of a loop of Henle in nephrons is an evolutionary adaptation that enables mammals and birds to reabsorb water efficiently and produce a ________ urine.
A. hypertonic B. hypotonic C. isotonic D. osmolar