A red blood cell is placed in a solution. After a period of time, the cell has shrunk to half its original size. Which of the
following is true?
a. Water moved from the solution into the cell.
b. The solution inside the cell is hypertonic.
c. The cell was placed in a hypertonic solution.
d. The cell was placed in an isotonic solution.
e. Salt left the cell resulting in its change in size.
ANSWER: c
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What is the primary function of the transverse tubules?
A. They conduct action potentials from the surface of the muscle fiber to internal regions near myofibrils. B. They act as a channel for Ca2+ ions during excitation-contraction coupling. C. They form cross-bridges between actin and myosin during muscle contraction. D. They attach troponin to tropomyosin. E. They attach muscle fibers to skeletal elements to exert force.
Bacteria ____
a. are haploid b. are diploid c. are polyploid d. have double-stranded RNA genomes e. have single-stranded DNA genomes
Each species occupies a certain __________characterized by physical and chemical features and by
the array of other species living in it. Fill in the blank(s) with the appropriate word(s).
A measure of the reproductive fitness of genetic relatives resulting from the actions of an individual is called ________
A) direct fitness B) indirect fitness C) inclusive fitness D) kin selection