HIV-positive people track their progression of their disease with blood tests that measure the number of
A. blood platelets.
B. B cells.
C. helper T cells.
D. cytotoxic T cells.
E. plasma cells.
C. helper T cells.
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Which was likely the first of the following metabolic pathways or structures to evolve?
A. fermentation B. the citric acid cycle C. electron transport complexes I, II, and III D. ATP synthase E. All four probably arose at the same time in an early prokaryote.
Griffith first proposed the "transformation principal" through his studies on Streptococcus pneumoniae bacterium. Which of the following molecules was later found to be responsible for this phenomenon?
A. protein. B. RNA. C. DNA. D. phage. E. bacteriophage.
A primary advantage of using integrated nutrient management compared to inorganic chemical fertilizers is that
A. less organic fertilizer is needed than chemical fertilizers. B. only organic fertilizers contain micronutrients. C. organic fertilizers release nutrients more slowly. D. chemical fertilizers are not soluble in water. E. chemical fertilizers break down very slowly.
Is it possible to be a "carrier" (phenotypically normal but capable of passing the allele to one's offspring) for a sickle-cell anemia?
a. yes b. no