The vertebrate lung first appeared in ____
a. fishes
b. amphibians
c. reptiles
d. birds
e. mammals
ANSWER: a
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Hydrostatic elements of vertebrates that have bony endoskeletons include:
A. the cytoskeletal proteins present in individual cells. B. intervertebral disks. C. the ligaments that reinforce joints. D. the keratinized outer covering.
Androgen insensitivity is caused by lack of a specific ____________________ protein. Fill in the blank(s) with the appropriate word(s)
Griffith, a British microbiologist, used bacteria and mice to demonstrate the process of transformation. During transformation,
A. genetic material is transferred from one bacterial cell to another. B. a bacterial chromosome produces an exact copy of itself. C. the nucleus of a mouse cell repairs itself when damaged by bacterial infection. D. a bacterial cell is transformed into a spore during unsuitable environmental conditions. E. DNA from an infected mouse cell changes bacteria from a nonpathogenic to a pathogenic form.
What is the basis of natural selection?
A. a change in the appearance of a species over time B. individuals passing on their traits to their offspring C. unequal reproductive success D. the accumulation of favorable traits in a population