When blood pressure rises rapidly the body responds by ____
a. increasing heart rate
b. increasing muscle contractions around veins
c. decreasing the diameter of arterioles
d. vasodilation of arterioles
e. increasing the movement of fluid into capillaries
ANSWER: d
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The structural genes of the lactose operon are: (Select all correct choices)
A. always expressed unless the operon is turned off by a repressor. B. turned on in the presence of lactose. C. turned off by the presence of lactose.
In sewage treatment, the removal of phosphates and nitrogen compounds is achieved during
A. primary treatment. B. secondary treatment. C. advanced treatment. D. quaternary treatment.
what is the pathophysiology of diphtheria toxin?
What will be an ideal response?
Thanks to a novel recessive mutation, a certain plant species has begun to invade colder Arctic regions outside of its normal range. However, this cold-tolerant mutation has not yet become fixed in the population. A second mutation arises that promotes self-pollination. Do you predict that the self-pollination allele will be selected for in the Arctic regions? Why or why not?
A. No. Plants that produce flowers must be cross-pollinated for proper seed development. B. Yes. The self-pollinated plant is more likely to maintain the cold-tolerant mutation, and plants in the Arctic are unlikely to be visited by pollinators. C. No. Outcrossing is always beneficial, since it enhances genetic diversity. D. Cannot make a prediction from the information given. It depends on whether the plant is normally insect-pollinated or wind-pollinated.