As an adult, which typical chordate embryonic traits do adult tunicates retain?
a. hollow, dorsal nerve cord
b. notochord
c. gill slits
d. tail extending beyond anus
e. carbohydrate “tunic”
ANSWER: c
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Which of the following is the strongest evidence that cytokinins regulate cell divisions? There is _____
A) an increase of cyclin gene expression in tissues exposed to cytokinin B) a decrease of cyclin gene expression in tissues exposed to cytokinin C) an induction of shoot growths in tissues exposed to cytokinin D) an induction of root growths in tissues exposed to cytokinin E) an ability of cytokinin to interact with auxin at the molecular level and change auxin biosynthesis and transport
The mutation that resulted in the lighter skin
color of people of European descent occurred between ____ and ____ years ago.
a. 100...600 b. 1000...6000 c. 6000...10,000 d. 100, 000...600,000 e. 600,00... 1,000,000
Which of the following is NOT true of enzyme behavior?
a. Enzyme shape may change during catalysis. b. Enzymes cannot make something happen that would not happen on its own. c. All enzymes have an active site where substrates are temporarily bound. d. Each enzyme can catalyze a wide variety of different reactions. e. Enzymes speed up reactions.
What differentiates virulent strains of Streptococcus pneumoniae from nonvirulent strains?
A) the species-specific teichoic acid present in its cell wall B) the type of Lancefield antigen it produces C) the presence of a polysaccharide capsule D) the type of toxins it produces E) the extent of the hemolytic zone it produces when it is grown on blood agar