Which of the following is the least successful
method of birth control?
a. early withdrawal
b. a condom alone
c. a spermicidal jelly or foam alone
d. douching
e. the Pill
D
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Stomata close as a result of water moving into guard cells
____________________ Indicate whether the statement is true or false.
Which of the following can affect a small, endangered population so severely that it goes extinct?
A) Lost alleles and/or low genetic diversity B) Increased mating opportunities C) Sexual selection D) Artificially adding new genes E) Matings with a closely related species
The pH of the digestive tract is
A) low throughout. B) basic in the stomach and acidic throughout the rest of the tract. C) acidic in the stomach and neutral in the intestines. D) high throughout. E) neutral throughout.
A 25-year-old woman is in early labor. After delivering the baby (by a normal vaginal delivery), the patient asks the doctor about some symptoms she had during pregnancy, including discharge and painful urination. She has a history of multiple sex
partners and very rarely used condoms. You suspect a potential STD is the cause. The biggest risk at this point is ________. A) There is no major risk at this point. B) to the baby; he or she can be infected while moving through the birth canal C) to the mother; she may become infertile D) to the mother; an untreated STD is almost always fatal