Echinoderms in their larval state have _____.
a) triangular symmetry
b) radial symmetry
c) hexagonal symmetry
d) bilateral symmetry
Ans: d) bilateral symmetry
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Which of the following is an assumption used in the molecular clock approach?
A) Nucleotide changes accumulate in a sequence in proportion to time. B) Nucleotide changes are generally NOT transferred to progeny. C) Nucleotide changes are NOT random. D) Nucleotide changes are subject to intense selective pressure.
Which connective tissue contains fibroblasts?
a. blood b. adipose c. cartilage d. bone e. loose connective tissue
Secondary xylem is formed in association with the ____
a. pith b. inner face of the vascular cambium c. outer face of the vascular cambium d. inner face of the cork cambium e. outer face of the cork cambium
Repressor proteins do not
a. prevent binding of RNA polymerase to DNA. b. cause the DNA regions that contain the operator to twist or loop. c. inactivate operon genes when their products are not required. d. bind to sets of operators. e. increase transcription rates