Explain why the overprescription of antibiotics by doctors, or the overuse of everyday soaps containing antibiotics, can be a health risk.

Since the modern synthesis, the technical definition of evolution is a change in allele frequency in a population over the course of generations.

a. Traits, species

b. Allele frequency, population

c. Natural selection, natural environment

d. Adaptations, single organism

e. Fitness, population

Even though marsupial mammals give birth to live young, an eggshell forms briefly early in their development. This is evidence that:

a. Marsupials share a common ancestor with some egg-laying species

b. Marsupials are not really mammals

c. All animals arose from a common ancestor.

d. Marsupial mammals were separately created by God

e. The fossil record of marsupial mammals is incorrect

Lysozyme, an enzyme found in human saliva, tears, and other secretions, catalyzes the hydrolysis of the β-1,4-glycosidic linkages in peptidoglycan. Predict the effect of this enzyme on bacteria and how it may be involved in human health.

Within a few weeks of treatment with the drug 3TC, a patient's HIV population consists entirely of 3TC-resistant viruses. How can this result best be explained?

a. HIV can change its surface proteins and resist vaccines.

b. The patient must have become reinfected with a resistant virus.

c. A few drug-resistant viruses were present at the start of treatment, and natural selection increased their frequency.

d. HIV began making drug-resistant versions of its enzymes in response to the drug.

Evaluate this statement: Evolution is said to occur when new traits accumulate over time, increasing complexity.

Galactosemia is a potentially fatal disease that occurs in humans who lack the enzyme that converts galactose to glucose. If you were a physician treating a person with this disease, which of the following would you have them exclude from their diet?

a. Maltose

b. Starch

c. Mannose

d. Lactose

The similarity in skin color among different human populations appears to be primarily the result of:

a. Natural selection

b. Convergent evolution

c. Which biological race they belong to

d. A and B are correct

e. A, B, and C are correct

A species of crayfish that lives in caves produces eyestalks like its above-ground relatives, but has no eyes. Eyestalks in cave-dwelling crayfish are thus ________.

a. An evolutionary error

b. A dominant mutation

c. Biogeographical evidence of evolution

d. A vestigial trait

e. Evidence that evolutionary theory may be incorrect