The two purine nitrogen bases are adenine and guanine
a. True
b. False
Indicate whether the statement is true or false
True
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Interferons, interleukins, and lymphokines are examples of:
A. chemical barriers. B. immune cells. C. immunoglobulins. D. mast cells. E. cytokines.
Which structure is not associated with the secretion of proteins produced by ER?
a. golgi complex. b. smooth ER. c. transport vesicles. d. lysosomal membrane. e. plasma membrane.
Phospholipids are important components of the plasma membrane. What does "B" represent on the diagram?
A. phosphorus B. oxygen C. nitrogen D. polar (hydrophilic) region E. nonpolar (hydrophobic) region
A stimulus either causes an action potential or it doesn't. This is called ________.
A. a latent period response B. an all-or-none response C. a graded response D. a local response E. a relative refractory response