Which cells are not normally involved in the functioning of the immune system in humans?
A) white blood cells
B) red blood cells
C) lymphocytes
D) B cells
B
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During the contraction of a vertebrate skeletal muscle fiber, calcium ions _____
A) break cross-bridges by acting as a cofactor in the hydrolysis of ATP B) bind with troponin, changing its shape so that the myosin-binding sites on actin are exposed C) transmit action potentials from the motor neuron to the muscle fiber D) spread action potentials through the T tubules E) re-establish the polarization of the plasma membrane following an action potential
The polymerase chain reaction (PCR) is used to:
A. generate single copies of whole chromosomes. B. generate multiple copies of whole chromosomes. C. generate a single copy of a targeted region of DNA. D. generate multiple copies of a targeted region of DNA. E. b and d.
In the light dependent reactions of the cyclic pathway, which molecule is produced?
a. sugar b. NADPH c. oxygen d. ATP e. water
The threshold of human skin temperature at which cool or cold is perceived as pain is
A) 0°F. B) 59°F. C) -5°F. D) 32°F.