How do group A streptococci camouflage themselves from white blood cells?
A) They produce coagulase, allowing the bacteria to hide within blood clots.
B) They grow in chains or pairs.
C) They produce streptokinase, which breaks down blood clots.
D) They have hyaluronic acid capsules.
E) They have a coating of protein M.
D
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A heritability value of 0.6 for IQ indicates that 60 percent of a person's IQ results from genetic
influence. Indicate whether the statement is true or false.
A cell releases chemical signals into its surrounding space in order to communicate with neighboring cells. Which of the following must occur for the communication to be successful?
A) The chemical signal must bind to hormones on the neighboring cells B) The same chemical signal must be produced within the neighboring cells C) The neighboring cell must have the receptor to receive the signal
In order to generate one glucose molecule, the Calvin cycle has to turn how many times?
A. 3 B. 6 C. 12 D. 2 E. 1
Nerve impulses cannot reverse and travel up the axon toward the cell body due to _____
the refractory period the resting potential the action potential summation