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

Biology & Microbiology

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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

Biology & Microbiology

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.

Biology & Microbiology

In the light dependent reactions of the cyclic pathway, which molecule is produced?

a. sugar b. NADPH c. oxygen d. ATP e. water

Biology & Microbiology

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.

Biology & Microbiology