A bacteriologist is studying two asexually reproducing strains of E. coli. The two require different amounts of trace minerals for survival; on these grounds, the bacteriologist determines that they are separate species
In making his determination, he is using which
species concept or concepts? Select all that apply
A. biological species concept
B. ecological species concept
C. morphospecies concept
D. evolutionary species concept
E. none of these
B
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Acetic acid gives vinegar its sour taste. Which functional group has acidic properties and would release hydrogen ions in an aqueous (water) solution?
A. -OH B. -NH2 C. -SH D. -COOH E. -CO
A taproot system lacks
a. lateral roots. b. a taproot. c. both of the above. d. none of the above.
In G2, there are typically high levels of the mitotic cyclin. Why is cdc2 not active during G2 if the mitotic cyclin is present?
A. Cdc2 requires ubiquitination to be activated. B. Cdc2 does not bind to the mitotic cyclin. C. Cdc2 is also regulated by phosphorylation. D. Cdc2 also has to bind to cohesin to be activated.