Based on the illustration, if a person were to have a mutation in the RAF protein, and it was unable to bind GTP, what would happen to the pathway?
a. The pathway would stop at GRB2, and SOS would not activate RAS.
b. The pathway would stop at EGRF, and no ligand binding would occur.
c. The pathway would stop at RAF, and RAF would not phosphorylate MEK.
d. The pathway would continue unimpeded.
c. The pathway would stop at RAF, and RAF would not phosphorylate MEK.
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What is the purpose of the P element in the creation of transgenic Drosophila?
A) Efficiently transfer DNA into Drosophila chromosomes. B) Transfer DNA into a specific site in the host chromosome. C) Transfer DNA only into the nuclei of somatic cells. D) Transfer DNA only into primitive eye cells.
Repolarization of a neuron following an action potential most often requires opening of ______ channels.
Fill in the blank(s) with the appropriate word(s).
Which of the following is a physiological response that takes place in many animals when they get too hot?
A) slowing of the heart rate B) constriction of blood vessels in the skin C) contraction of muscles D) increased blood flow to the skin
Identify which of the following scenarios is most probable for the evolution of members of genus Homo.
A. Australopithecus afarensis gave rise to Homo habilis who gave rise to Homo ergaster who gave rise to Homo erectus B. Ardipithecus ramidis gave rise to Homo habilis who gave rise to Homo ergaster who gave rise to Homo erectus C. Australopithecus afarensis gave rise to Homo habilis who gave rise to Homo sapiens who gave rise to Homo erectus D. Australopithecus afarensis gave rise to Homo erectus who gave rise to Homo ergaster who gave rise to Homo habilis