For an atom that is NOT an ion, which of the following must be TRUE?
a. the number of electrons equals the number of protons
b. the number of protons equals the number of neutrons
c. the number of electrons equals the number of neutrons
Ans: a. the number of electrons equals the number of protons
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P. vivax is suspected in a patient who has been traveling for months in the tropics. Blood was collected in a lavender top tube; however, the slide was not prepared for examination until the next day because the specimen came in on the night shift. Once the slide was prepared and ex-amined, Schüffner dots were not visible. Which one of the following statements explains this discrepancy?
a. Schüffner dots are not characteristic of P. vivax infections. b. The blood film was most likely incorrectly prepared. c. The blood should have been collected in a red top tube. d. The blood remained in the tube too long, yielding false-negative results.
Inversions are most likely to affect an organism's phenotype
A) if one or both of the inversion's breakpoints lies within the transcribed region of a gene. B) if the inversion's breakpoints are on either side of a gene and its regulatory regions and the entire gene is reversed in the genome. C) if the inversion is pericentric. D) if the inversion is paracentric. E) if the inversion is small.
In the ABC model of flower development in Arabidopsis thaliana, sepals form when which gene(s) is/are switched
on? a. A only b. A and B c. B and C d. C only e. A and B and C
Which of the following distinguishes the secondary immune response from the primary immune response?
A) The primary response is specific; the secondary one is not. B) The secondary response is faster and stronger. C) The primary response involves B cells; the secondary one involves T cells. D) The secondary response allows different antigens to be recognized faster.