Which of the following are examples of amplification of a hormone signal?
I) Epinephrine initiates an enzyme cascade.
II) Steroids bind hormone-response elements in the cell and initiate transcription of many genes.
III) A quantity of 0.09 mg of growth hormone leads to a 10,000-mg weight gain in a cow.
IV) Different cell types have different receptors capable of binding the same hormone.
A) only I and III
B) only II and IV
C) only I, II, and III
D) only II and III
E) I, II, III, and IV
Answer: C
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What can animals do to maintain an energy balance when food supplies become scarce in winter?
A. All of these answer options are correct. B. hibernate to reduce energy expenditure and conserve energy reserves C. migrate to areas with more abundant food supplies D. migrate to warmer areas E. build up enough of a positive energy balance during summer and fall to sustain them through the winter
A good working definition of life does not need to incorporate that living things ________.
Fill in the blank(s) with the appropriate word(s).
Although water is considered a renewable resource, what is a reason why it might be more like a nonrenewable resource?
a. water resources are not evenly distributed around the world b. water can be used up faster than it can be returned in the water cycle c. water can be polluted, depleting the supply of fresh water d. b and c e. all of the above
Jonas Salk developed a(n) (attenuated/inactivated/subunit) polio vaccine in 1955
What will be an ideal response?