When hydrophilic hormones bind to surface receptors, the ____
a. signal is amplified
b. signal is inhibited
c. receptor is activated
d. receptor is deactivated
e. hormone is transduced
ANSWER: c
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A positive tuberculin skin test, or PPD test, is characterized by:
a. erythema and induration. b. redness and rash. c. swelling and erythema. d. edema and rash.
In order to activate the cell mediated arm of the
adaptive immune response, which of the following must occur?
a. A naïve helper T cell must bind to an antigen-presenting dendritic cell. b. A naïve B cell must be activated in order to activate the effector helper T cell. c. A free bacterium must pass through a lymph node where it will directly activate the effector helper T cell. d. A damaged or infected body cell must pass through a lymph node in order to activate T cells. e. None of these will activate the cell mediate arm.
Which of these occurs during vigorous exercise?
a. ATP accumulation b. actin depletion c. lactate formation d. glycogen buildup e. creatine phosphate formation
Once a hormone activates the enzyme adenylyl cyclase, ATP is converted to cAMP, which in turn:a
activates protein kinase. b. inhibits phosphodiesterase. c. initiates more cAMP production. d. initiates protein synthesis. e. inhibits protein synthesis.