In male mammals, excretory and reproductive systems share the _____

A) testes
B) urethra
C) seminal vesicle
D) vas deferens
E) prostate


Answer: B

Biology & Microbiology

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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

Biology & Microbiology

A carcinogen is not a mutagen.

Answer the following statement true (T) or false (F)

Biology & Microbiology

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.

Biology & Microbiology

In using the scientific method, which step must precede the formulation of a hypothesis?

a) experiment b) conclusion c) observation d) data collection

Biology & Microbiology