As temperature increases, the rate of diffusion ________
a. increases.
b. decreases.
c. remains the same.
a
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The human immunodeficiency virus (HIV) only affects a specific class of cells in the immune system called helper T cells, and not other types of T cells. Which is the best explanation for this observation?
A. Only helper T cells have the correct receptor on their cell surface. B. HIV can only be released from helper T cells. C. Only helper T cells have reverse transcriptase. D. HIV can only replicate inside of helper T cells. E. The helper T cells are not necessary for the immune system to fight viral infections.
Muscle electrical activity can be recorded in a lab using a ___
A. Electrocardiogram B. Electrogastrogram C. Electroencephalogram D. Electromyogram
Hydrogen ions cross the thylakoid membranes from the stroma by
A) simple diffusion. B) osmosis. C) facilitated diffusion. D) synthesis. E) active transport.
An organic compound that provides instructions for the synthesis or production of polypeptide chains is referred to as which of the following?
A) lipids B) DNA C) ATP D) nucleotide