Symbiotic association in which one partner lives on or in another and metabolically depends on it iscalled:a
symbiosis.
b. mutualism.
c. commensalisms.
d. parasitism.
e. colonialism..
D
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Choanoflagellates are the closest protistan relatives of animals
A. true B. false
Why do positively charged amino acids appear more often than usual in histone proteins?
A. Because histones have a higher molecular mass, which improves DNA compaction B. Because histones are strongly attracted to the positively charged phosphate backbone of DNA C. Because histones and DNA have opposite charges, which improves the compaction of DNA into nucleosomes D. Because histones and DNA have the same charge, which improves the compaction of DNA into nucleosomes
The primary difference between active transport and facilitated diffusion is that active transport is the only one in which
A) [S]high ? [S]low. B) transporter proteins are required. C) [S]low ? [S]high. D) the concentration gradient provides the necessary energy for movement. E) only water molecules move.
The genetic code is
A) triplet, overlapping, and not universal. B) triplet, non-overlapping, and universal. C) quarternary, overlapping, and non-universal. D) singular, non-overlapping, and universal.