The "one gene–one enzyme" hypothesis of George Beadle and Edward Tatum was an oversimplification because:
A. mutations may not completely inactivate an enzyme.
B. some enzymes contain more than one polypeptide.
C. some enzymes can be phosphorylated.
D. auxotrophs can be corrected.
E. some RNAs are independently catalytic.
B
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In Gram-stained preparations, M. atlantae will appear as:
a. either gram-negative coccobacilli or short, broad rods that tend to resist decoloriza-tion and may appear gram-variable. b. gram-negative cocci in pairs or short chains. c. coccobacilli or medium-sized rods. d. coccobacilli that may appear in chains.
What are plants that flower only once before they die, normally after two seasons of growth, called?
A. annuals B. biennials C. perennials D. monocots E. dicots
Pathogens enter the skin through which means?
a. bites of other organisms b. diffusion across the stratum corneum c. breaks in the skin d. digestive enzymes creating passage
Globally, cigarette smoking kills four million people
annually. That number is expected to increase to _____ million by 2030. a. 10 b. 50 c. 100 d. 150 e. 250