Given the diversity in protist ultrastructure and molecular data, biologists regard the protists as a(n) ____ group,
meaning that some are descendants of a common eukaryote ancestor.
a. monophyletic
b. paraphyletic
c. polyphyletic
d. homoplastic
e. homologous
b
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The second law of thermodynamics states that
a. energy can be transformed into matter, and because of this, something is obtained for nothing. b. energy can be destroyed during nuclear reactions such as those that occur inside the sun. c. if energy is gained by one region of the universe, another place in the universe also must gain energy in order to maintain the balance of nature. d. energy tends to flow from concentrated to less concentrated forms. e. none of these is true.
The RNA molecule is made up of how many strands?
a. 1 b. 2 c. 3 d. 6 e. 12
Which general genetic process is believed to account for the variety of cellular structures and functions in eukaryotic cells?
A) maternal environmental activities B) RNA processing C) negative control exclusively D) variable gene activity E) intron processing
The three components of a DNA nucleotide are:
A) genes, sugars, and bases. B) amino acids, phosphates, and deoxyribose. C) phosphates, sugars, and bases. D) bases, deoxyribose, and polymerases. E) polymerases, ligases, and sugars.