Blood returning to the heart enters:
a. a ventricle
b. the aorta
c. an atrium
d. a capillary bed
e. all of these
c
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The sexual phase of Plasmodium is called a:
A. sporozoite B. gametocyte C. merozoite D. plasmacyte E. anthracite
A substance that in some way harms the health, activities or survival of a population is a(n)
a. pollutant. b. nonrenewable resource. c. ecological footprint. d. reservoir. e. limiting factor.
Numerical identification methods rely on a series of which kind of test to identify microorganisms?
a. ELISA b. DNA base composition c. DNA fingerprinting d. biochemical testing
The outside of a neuron is positively charged at resting potential. Why don't negative ions exit from the cell to normalize charge across the membrane?
A. All of the chloride ions are already outside the cell. B. The negative charge inside the cell is carried by large proteins that cannot diffuse through the membrane. C. There are no negative ions inside the cell. D. The positive charge outside the cell repels negative ions.