Two species of salamander have similar ranges, but one breeds from January to March, while the second one breeds from March to May. This is an example of
A. habitat isolation.
B. behavioral isolation.
C. mechanical isolation.
D. gametic isolation.
E. temporal isolation.
Answer: E
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A physician is attempting new therapies for HIV patients who are suffering from an impaired immune response. He decides to try using a recombinant form of colony-stimulating factor cytokine (CSF). Why?
A. CSF is a strong inducer of antiviral activities in our cells, and may help our immune system fight off the effects of HIV for a longer period of time. B. CSF will hyperstimulate the activities of the macrophages, leading to ingestion and destruction of HIV-infected cells. C. CSF will help to stimulate the production of new lymphocytes-the very cells that are infected and depleted during an HIV infection. This may help to keep the patients' immune responses "normal" for a longer period of time before they succumb to full-blown AIDS. D. CSF will drive up the production of lactoferrin, a strong antiviral compound produced in our mucus membrane secretions.
An air environment, gravity, and desiccation are three challenges that were addressed in the evolution of reptiles. What three evolutionary innovations addressed these challenges?
a. Gills, bony skeleton, and lungs b. The amniotic egg, sturdy fins, and a cartilaginous skeleton c. Dorsal nerve cord, notochord, and a post-anal tail d. . Better limb support, gills, and pharyngeal slits e. Lungs, better limb support, and the amniotic egg
Which of the following is true of archaea that produce methane?
A. they reduce carbon dioxide in the presence of nitrogen B. they live in the most extreme environments C. they are always anaerobes D. they have been discovered on Mars
Assume that a species has a diploid chromosome number of 24. The term applied to an individual with 25 chromosomes would be ________
A) euploid B) triploid C) trisomy D) aneuploidy E) aneuploidy and trisomy