When analyzing amylase activity in the lab, why are the test tubes incubated at 37 degrees C?
A) It is a convenient temperature in the lab setting.
B) It is the optimal temperature for enzyme activity.
C) It is the optimal temperature to denature the substrate.
D) It is the optimal temperature to grow the substrate.
Answer: B
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The most accurate definition of artery is a vessel that
A) transports blood away from the heart. B) transports blood toward the heart. C) carries highly oxygenated blood. D) contains internal valves. E) contains smooth muscle in its wall.
Select the first step for synaptic signaling when the action potential arrives at the axon terminal of a presynaptic neuron
a. A neurotransmitter is released by exocytosis. b. Calcium flows into the synaptic knob. c. The neurotransmitter combines with a protein receptor on the subsynaptic membrane. d. The permeability is altered in a postsynaptic neuron. e. The axon terminal depolarizes.
Which of the following is true about carpal tunnel syndrome?
A. it is a neurological impairment B. it is associated with repetitive keyboard use C. both A & B D. none of the above
The interior surface of a neuron's plasma membrane at resting membrane potential will have a ________
A) negative charge and contains more sodium than outside of the cell B) positive charge and contains less sodium than outside of the cell C) positive charge and contains more sodium than outside of the cell D) negative charge and contains less sodium than outside of the cell