One way that antibiotic-resistant strains of bacteria arise is that patients do not follow the instructions for taking the drug. In a typical scenario, a drug may be prescribed for a week, but the patient may stop taking it after 2 to 3 days if they start to feel better. Then when the infection flares up again, they take the rest of their dose. Why would this scenario lead to drug resistance?
A. The first round of treatment gives the bacteria a chance to learn how to metabolize the drug.
B. A patient begins to develop resistance to the drug.
C. The body clears the drug faster, once it is exposed a second time.
D. The first round of treatment does not kill the most resistant bacteria, which then increase in number.
E. The first round of treatment suppresses the immune system, making the patient more susceptible to other infections.
D. The first round of treatment does not kill the most resistant bacteria, which then increase in number.
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Which of the following is the major reason why it has been difficult to treat viral infections with chemotherapeutic agents?
A. Viruses use the metabolic machinery of their hosts, which limits many of the potential points of attack. B. Viruses have no metabolism and therefore offer no selective point of attack. C. Viral metabolism resembles that of their hosts so there is no selective point of attack. D. Actually, viruses are not difficult to treat with chemotherapeutic agents.
What environmental factor can lactation periods be affected by?
a. Temperature of habitat b. Predator numbers c. Amount of other pinnipeds when lactating d. Available nutrients
Select the correct pair of statements about FSH and LH function.
A. In males, FSH stimulates spermatogenesis and LH stimulates Leydig cells to secrete testosterone. In females, FSH stimulates growth of follicles and LH stimulates ovulation and development of the corpus luteum. B. In males, FSH stimulates spermatogenesis and LH stimulates Leydig cells to secrete testosterone. In females, FSH stimulates ovulation and development of the corpus luteum and LH stimulates growth of follicles. C. In males, FSH stimulates Leydig cells to secrete testosterone and LH stimulates spermatogenesis. In females, FSH stimulates growth of follicles and LH stimulates ovulation and development of the corpus luteum. D. In males, FSH stimulates Leydig cells to secrete testosterone and LH stimulates spermatogenesis. In females, FSH stimulates ovulation and development of the corpus luteum and LH stimulates growth of follicles.
Lung cancer, like breast cancer, is more prevalent in women than in men.
Answer the following statement true (T) or false (F)