Patient X has 150 CD4 T cells/mm3. What phase of an HIV infection is this patient in?
A. terminal phase (E)
B. transmission phase (D)
C. acute phase (A)
D. chronic phase (B)
E. AIDS (C)
Answer: E
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The formula p2 + 2pq + q2 = 1 is associated with which of the following?
A. Calculations of heterozygosity B. Hardy-Weinberg equilibrium C. Calculations of recombination frequencies D. Degrees of freedom
In biology lab, you observe lumps of plant tissue. Your instructor tells you that they have been grown artificially and can produce new plants. Each lump is a(n)
A. scion. B. stigma. C. tetraploid zygote. D. callus. E. amnion.
Which of the following glands secretes hormones that enable the body to respond to stress?
A) pancreas B) adrenal C) pineal D) parathyroid
All of the following statements are true about the clam's digestion EXCEPT
A. the clam has a single opening for the entry of food and the exit of digestive wastes. B. small food particles are collected on the gills and moved by cilia to the mouth. C. the clam is a filter feeder. D. the clam is a continuous feeder.