In polygenic inheritance, phenotypic characters are
A) determined by a double pair of alleles.
B) determined by interactions among several genes.
C) determined by multiple copies of a single gene.
D) always controlled by genes on the same chromosome.
E) determined by the genes on the Y chromosome.
Answer: B
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Which is a TRUE statement about excitation-contraction coupling?
A. In skeletal muscle cells, it requires the influx of extracellular calcium ion. B. In skeletal muscle cells, excitation-contraction coupling begins when an action potential propagates along the sarcoplasmic reticulum membrane. C. Calcium-induced calcium release plays a role in cardiac muscle cells, as well as in some smooth muscle cells. D. In smooth muscle cells, it must be preceded by an action potential in the cell membrane. E. In all kinds of muscle it requires the entry of calcium from the extracellular fluid.
The fulcrum of a lever system is the
A) joint. B) muscle. C) bone. D) resistance. E) load.
Psychosocial influences can lead to obesity
Indicate whether the statement is true or false
Movement of particles from higher to lower concentrations through a membrane, such as in dialysis, occurs by _____.
A) diffusion B) active transport C) osmosis D) filtration