Ligand binding to a receptor kinase results in:
A. phosphorylation of the cytoplasmic domain
of the receptor.
B. binding of cytoplasmic signaling
molecules.
C. receptor dimerization.
D. All of these answer options are correct.
D
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The parasite Plasmodium, the causative agent of malaria, has a complex life cycle, including both sexual and asexual reproduction. Where does zygote formation (the fusion of two gametes to produce new sporozoites) occur?
1.In the gut of the female mosquito.
2.In the liver of an infected human.
3.In the red blood cells of an infected human.
4.In the liver of the male mosquito.
Of the following, who is most likely to develop a chronic infection with hepatitis B virus?
A) children between the ages of 2 and 12 B) newborns C) females at puberty D) young adults E) the elderly
Many animals share homologues of the gene PAX6, which is important in the development of ________
a. legs b. eyes c. segmentation d. wings
If an organism produces abnormally high levels of leptin, predict what would happen to that organism's weight, and explain why the change would occur.
A. Weight gain would occur as a result of increased fat storage. B. Weight gain would occur as a result of increased appetite. C. Weight loss would occur as a result of increased metabolic activity and reduced fat storage. D. Weight loss would occur as a result of decreased digestive enzyme production. E. Weight loss would occur as a result of decreased appetite.