The vessels that return blood to the heart in a closed circulatory system are referred to as
A. arteries.
B. veins.
C. capillaries.
D. sinuses.
E. auxiliary hearts.
B. veins.
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An action potential can always be initiated specifically at which of the following locations associated with a neuron?
A) ion channels B) synaptic boutons C) nodes of Ranvier D) both choices A and B E) none of the above
Do all cells of the body express the same genes?
A. No, since they don't all need to make the same proteins B. No, since they don't contain the same DNA C. Yes, since they all contain the same DNA D. Yes, since they all make the same proteins
Why do some Basidiomycetes form a ring like organization, as observed on the top of soil?
a. They deplete the soil of magnesium. b. They deplete the soil of oxygen. c. They deplete the soil of nitrogen. d. They deplete the soil of potassium.
The worldwide, primary viral cause of morbidity and mortality from diarrhea is
A) Influenza viruses B) Rhinoviruses C) Rotavirus D) Coxsackie viruses E) Caliciviruses