In people who have PKU, phenylalanine cannot be converted into the amino acid ____________. Fill in the blank(s) with the appropriate word(s)
ANS: tyrosine
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Place the following events of an inflammatory
event in response to bacterial infection in proper order. 1. activated complement binds to bacteria 2. capillary permeability increased 3. phagocytes engulf bacteria 4. mast cell receptors bind to bacterial antigens 5. signaling molecules cause arterioles to widen
a. 4-5-2-1-3 b. 4-3-1-2-5 c. 5-2-1-4-3 d. 1-3-4-2-5 e. 5-2-4-1-3
Dyes are usually added to sections of biological specimens to increase
a. resolving power. b. magnification. c. contrast. d. all of the above.
The folds of the stomach are called
a. villi. b. microvilli. c. tight junctions. d. rugae. e. haustra.
Imagine that NASA discovered a new planet with an atmosphere rich in hydrogen gas, hydrogen sulfide, ammonia and methane. We would call this a(n)
A. oxidizing atmosphere because of the availability of oxygen compounds. B. reducing atmosphere, because of the availability of hydrogen atoms that can donate electrons. C. reducing atmosphere because the atmosphere would reduce the energy necessary to build molecules. D. oxidizing atmosphere because of the lack of oxygen gas.