During an active HIV infection, which cell type numbers drop significantly?
a. helper T cells
b. B cells
c. plasma cells
d. mast cells
e. cytotoxic T cells
ANSWER: a
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During which of the following steps of the TCA cycle does substrate-level phosphorylation take place?
A) TCA-2 B) TCA-3 C) TCA-4 D) TCA-5 E) TCA-6
Along with the Earth's rotation, winds have a large influence on ocean currents. Periodic strengthening or weakening of winds can therefore result in dramatic changes to marine and terrestrial ecosystems. El Ninõ is a periodic weakening of the trade winds that normally drive the South Equatorial Current and the Humboldt Current. The weakening of these trade winds during an El Ninõ event slows down or stops the Humboldt Current. What would occur as a result of an El Ninõ event? Check all that apply.
_____ The ocean waters off the west coast of South America would become warmer. _____ Most marine species off the coast of South America would experience rapid population growth. _____ Fisheries that operate off the coast of South America would see declining catches for some species. _____ The ocean water off the coast of South America would become colder.
In humans, blood cells are produced in the
a. bone marrow. b. heart. c. kidneys. d. liver. e. lymph nodes.
In a urine analysis, alkaline urine can indicate
a. metabolic problems. b. an infection. c. malfunctioning kidneys. d. prostate cancer. e. bladder cancer.