The bubonic plague epidemic that swept through Europe between 1348 and 1350 A.D. was induced by a(n)
A) virus.
B) prion.
C) protozoan.
D) bacterium.
E) unidentified eukaryotic organism.
D
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Which of the following would NOT be a characteristic of the first life forms on Earth, that is, the very first primitive cells?
A. Oxygen was required for the cells to survive. B. A molecule evolved as a way to store genetic information. C. A barrier made of organic molecules separated the "cell" from the environment. D. Chemical reactions evolved as a way for cells to capture energy from the environment.
The genotype for a pea plant that is homozygous recessive for both height and pea color would be:
a. tt. b. YY. c. TtYy. d. ttyy. e. TTYY.
Molecules that are ______ dissolve best in water, while ______ molecules do not dissolve well in water.
Fill in the blank(s) with the appropriate word(s).
In the case of comparing birds to other vertebrates, having four appendages is
a. a shared ancestral character. b. a shared derived character. c. a character useful for distinguishing the birds from other vertebrates. d. an example of analogy rather than homology.