The fossil called Lucy is a member of the species ________ that lived over 3 million years ago.
A. Homo habilis
B. Australopithecus africanus
C. Proconsul
D. Homo erectus
E. Australopithecus afarensis
Answer: E
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Mutations resulting from exposure to physical or chemical agents are called ________ mutations.
Fill in the blank(s) with the appropriate word(s).
Which of the following is NOT one of the assumptions of Lack's hypothesis?
A) There is no trade-off between a parent's reproductive effort in one year and its survival or reproductive performance in future years. B) The only effect on clutch size of offspring is in determining whether the offspring survive. C) The discrepancy between Lack's hypothesis and the behavior of individual birds may sometimes be more apparent than real. D) All of these are assumptions of Lack's hypothesis.
Two parents with widow's peak and short fingers have a child with a continuous hairline and long fingers. What are the genotypes of the two parents? (W = widow's peak; S = short fingers)
Select one: a. WWSS × wwss b. wwss × WWSS c. WWss × WWss d. WwSs × WwSs e. WwSs × wwss
Penicillin was considered a "miracle drug" for all of the following reasons EXCEPT
A) it was the first antibiotic. B) it does not affect eukaryotic cells. C) it inhibits gram-positive cell wall synthesis. D) it has selective toxicity. E) it kills bacteria.