Activation of a receptor tyrosine kinase will lead to _____.
a. phosphorylation of a cytoplasmic protein
b. changes in conformation and/or activity of cytoplasmic proteins
c. production of nitric oxide
d. a and b are correct
e. a, b and c are correct
Answer: d. a and b are correct
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Imagine that you are managing a large ranch. You know from historical accounts that wild sheep used to live there, but they have been extirpated. You decide to reintroduce them. After doing some research to determine what might be an appropriately sized founding population, you do so. You then watch the population increase for several generations, and graph the number of individuals (vertical axis) against the number of generations (horizontal axis). The graph will appear as
A) a diagonal line, getting higher with each generation. B) an ?S,? increasing with each generation. C) an upside-down ?U.? D) a ?J,? increasing with each generation. E) an ?S? that ends with a vertical line.
All of the following combinations are possible in the gametes of an organism that is AaBb EXCEPT
A) AB. B) aB. C) ab. D) Ab. E) aa.
Under runaway sexual selection, which of the following is/are reasons for "exaggerat-ed" male ornaments?
a. An exaggerated ornament increases male survival. b. The genes for male ornament and female preference are tightly genetically linked. c. A male's fitness is increased by virtue of being attractive to females. d. An exaggerated male ornament is unrelated to resistance against parasites. e. B and C.
Four of the five answers listed below are fat soluble vitamins. Select the exception
a. vitamin A b. vitamin C c. vitamin D d. vitamin E e. vitamin K