Which of the following best describes Phase I of HIV infection?
A) T cell count of 100 per cubic millimeter of blood
B) presence of an opportunistic infection
C) swollen lymph nodes, chills, fever, body aches
D) onset of AIDS
E) absence of HIV antibodies
C
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When bacteriophages use site-specific recombinases to enter the host genome and become dormant, they are said to be:
A. lytic phages. B. lysotoxic phages. C. parasitic phages. D. prophages. E. transducing phages.
Malaria is caused by Plasmodium falciparum, a non-motile protist that contains a cluster of microtubules at one end of the cell. Once injected into the blood stream, these microtubules are used to attach to red blood cells. Plasmodium falciparum is which of the following?
a. A protozoa b. An algae c. A slime mold d. A diatom e. An apicomplexan
The term amphipathic describes the characteristic of some molecules that have
A) two polar regions. B) only a single polar region. C) both a polar and a nonpolar region. D) no polar regions. E) two nonpolar regions.
Courtship for Anolis lizards involves the male displaying a dewlap (skin under the throat area) that varies in appearance based upon the species. Lizards that are found in darker, more shaded environments will have dewlaps that are lighter in color because they are more noticeable by potential mates. Which of the following mechanisms best explains how speciation is at work in this example?
A. Genetic drift B. Postzygotic isolation C. Natural selection D. Reinforcement