Bones of trained athletes may be visibly thicker and heavier than those of nonathletes because
A) athletes have lower blood calcium levels than nonathletes.
B) weight-bearing exercise increases bone mass and strength.
C) nonathletes have a low parathyroid hormone rate.
D) athletes produce more growth plates.
E) nonathletes produce fewer osteoids.
B
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Eukaryotic proteins do not require a targeting signal if they are destined to function in the:
A. nucleus. B. lysosome. C. plasma membrane. D. cytoplasm.
An F' plasmid results when
A. an integrated F plasmid is incorrectly excised, bringing host genes with it. B. an F+ × F- mating is interrupted before completion. C. an Hfr × F- mating is interrupted before completion. D. None of the choices are correct.
At rest, expiration is a(n) ________ process that involves ________.
A) passive : relaxation of the internal intercostals B) active : contraction of the internal intercostals C) active : the contraction of the diaphragm D) active : relaxation of the diaphragm E) passive : relaxation of the diaphragm and external intercostals
Calcium ions bind to
A. cross bridges. B. actin. C. troponin. D. tropomyosin. E. myosin.