In male mammals, excretory and reproductive systems share the _____
A) testes
B) urethra
C) seminal vesicle
D) vas deferens
E) prostate
Answer: B
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Which of the following can function as intracellular signaling molecules?
A) acylated homoserine lactones B) hydrophilic lipids C) quinones D) proteorhodopsins
A carcinogen is not a mutagen.
Answer the following statement true (T) or false (F)
Which of the following would be a modern example
of Lamarckianism? a. A strain of houseflies resistant to insecticides emerges. b. Squirrels separated by a river are found to be unable to interbreed. c. A son is born with a portion of his right index finger missing—the same portion that was severed from his father’s hand in an accident. d. A strain of houseflies resistant to insecticides emerges, and squirrels separated by a river are found to be unable to interbreed. e. A strain of houseflies resistant to insecticides emerges; squirrels separated by a river are found to be unable to interbreed, and a son is born with a portion of his right index finger missing—the same portion that was cut off from his father’s hand in an accident.
In using the scientific method, which step must precede the formulation of a hypothesis?
a) experiment b) conclusion c) observation d) data collection