You spray your kitchen with an insecticide to kill the cockroaches. A few survive and reproduce, producing a large healthy population in a few generations that all have similar genetic backgrounds. This is an example ofÂ
A. genetic drift.
B. assortative mating.
C. migration.
D. bottleneck effect.
E. mutation.
Answer: D
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Folic acid supplements have become especially important for pregnant women because _____
A) folic acid supplies vitamins that only pregnant women can use B) the folic acid is stored in adipose tissue by pregnant women so supplements are needed to make more available in the circulation C) the fetus makes high levels of folic acid D) folic acid deprivation is associated with neural tube abnormalities in a fetus E) folic acid deprivation is a cause of heart abnormalities in a newborn
Arteries carry
a. blood away from the heart. b. blood towards the heart. c. only oxygen-rich blood. d. only oxygen-poor blood. e. a combination of more than one of these
Some complement proteins form a membrane attack complex that
a. engulf an invador. b. releases cytotoxic chemicals into an invador. c. causes inflammation. d. creates a pore in an invador causing the punctured cell to disintegrate. e. protects invadors from cytotoxic chemicals.
A loaf of bread was left uncovered for two weeks on a scale measuring its mass. Mold grew on it, decomposing the bread. Assuming that the bread did not dry out, which of the following is a reasonable prediction of the weight of the bread and mold together?
What will be an ideal response?