How does HIV know which cells to infect?
A. It can infect cells with particular surface receptors.
B. It can infect any cell it comes in contact with.
C. It can only infect cells that are actively growing and dividing.
D. It only infects cells that line the reproductive tract.
E. It can only infect cells on surfaces of the body where the temperature is lower.
Answer: A
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Indicate whether the statement is true or false
An organism maintaining homeostasis with respect to sodium ion concentration in the blood would ______sodium excretion in the kidneys when sodium levels were low and ______ sodium excretion when sodium levels were high
a. maintain constant; maintain constant b. increase; maintain constant c. increase; decrease d. decrease; maintain constant e. decrease; increase
Which factor is the primary control of productivity in aquatic systems?
A) temperature B) precipitation C) light D) salinity
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Fill in the blank(s) with the appropriate word(s).