Cytotoxic T cells destroy cancerous cells by
A. forming the membrane attack complex.
B. releasing vesicles containing perforin.
C. activating natural killer cells.
D. opsonization.
E. secreting cytokines.
B. releasing vesicles containing perforin
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In Bacteria, sensor kinases that respond to extracellular signals transfer this signal to the cytoplasmic machinery by typically phosphorylating the ________ residues
A) histidine B) serine C) threonine D) tyrosine
It is sometimes jokingly said that you could study for your biology test by placing your textbook under your pillow at night and thereby learn by osmosis, as the knowledge would flow from the book to your brain while you slept
Aside from the obvious absurdity of this claim, what is wrong with the use of the word "osmosis" in this context? How might you lose knowledge (if knowledge could actually flow along a concentration gradient between a book and a brain) if you tried this technique?
Four of the five answers listed below reflect how humans have disturbed the balance of the global nitrogen cycle
Which is the exception? a. use of fertilizer b. combustion of fossil fuels c. airplane travel d. coal-fired power plants e. overuse of refrigerants
Which of the following statements about the energy yield of aerobic respiration is false?
A) Glycolysis and the "grooming" of pyruvate together produce more NADH per glucose molecule than does the citric acid cycle. B) Less than 50% of the chemical energy available in glucose is converted to ATP energy. C) Each FADH2 molecule yields 2 ATP molecules and each NADH molecule generates 3 ATP molecules. D) Most of the ATP derived during aerobic respiration results from oxidative phosphorylation. E) Oxidative phosphorylation resulting from 1 glucose molecule may yield 32—34 ATP molecules.