A superinfection results from
A. a decrease in most normal biota resulting in the overgrowth of an unaffected species.
B. build up of a drug to toxic levels in the patient.
C. the wrong drug administered to the patient.
D. an immune system reaction to the drug.
Answer: A
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A woman is much more likely than a man to contract a UTI. Which of the following practices would best reduce her chances of getting a UTI?
A. Using birth control pills B. Not wearing tight-fitting clothes C. Wiping with toilet paper in a front-to-back direction D. Daily antibiotic dose
14C is a radioactive isotope, and it turns into ____________________ when it decays.
Fill in the blank(s) with the appropriate word(s).
Blood flows more slowly in arterioles than in arteries because arterioles _________.
a. have narrow openings that impede the exit of blood from arteries b. collectively have a larger cross-sectional area than do arteries c. must provide an opportunity for exchange with the interstitial fluid d. have rings of smooth muscle that restrict blood flow to capillary beds e. are narrower than arteries
For natural selection to occur, adaptive traits must be inheritable. This means that change occurs at the level of DNA. Answer the following question with this in mind
a. How do new traits develop? b. How may the genetic changes contribute to evolution by natural selection? c. How can the degree of similarity in DNA or protein sequence be used to infer the degree of relatedness between species?