Stramenopiles are unique in that they possess:
A. double plastids
B. hairy flagella
C. alveoli
D. disk-shaped mitochondrial cristae
E. calcium carbonate crystals
B. hairy flagella
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Secondary succession occurs
a. after a fire. b. on a new volcanic island. c. on bare rock. d. on land exposed as a glacier retreats. e. none of these
The promoter in Figure 14-1 is labeled __________
a. 6 b. 3 c. 1 d. 2 e. 7
Which local regulator is stored in cells of the immune system and released during an allergic reaction?
a. histamine b. nitric oxide c. a growth factor d. a prostaglandin e. a neurotransmitter
When the intracellular level of lactose drops, the repressor protein binds to the operator of the lac operon and shuts
down translation of the lac structural genes. __________________ Indicate whether the statement is true or false.