Which of the following statements regarding the Ras protein is false?
A) Ras is monomeric.
B) It is regulated by GTPase activating proteins.
C) The ligands are largely steroid hormones.
D) It is regulated by Sos, a guanine nucleotide exchange factor.
E) Ras activates a cascade of phosphorylation events.
C) The ligands are largely steroid hormones.
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Mutation is one of the two factors that increase genetic variation
A. true B. false
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
Put the following events in the proper order:i
Pollen tube develops. ii. Pollen grain lands on the stigma. iii. Sperm fertilizes the egg.
a. i, ii, iii b. i, iii, ii c. ii, i, iii d. iii, ii, i
Blood can be a portal of exit when vascular puncture occurs by either
a. true b. false