The pair of traits that best illustrates convergent evolution is
A. an elephant's tusks and a beaver's teeth.
B. a lizard's arm and a bird's wing.
C. a cartilage skeleton in a shark and a bone skeleton in a dolphin.
D. a dragonfly's wing and a butterfly's wing.
Answer: C
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A DNA specimen that contains 30% guanine has ________ thymine.
A. 15% B. 20% C. 30% D. 60% E. The amount of thymine cannot be determined.
Which of the following molecules would be expected to be immunogenic?
A. Progesterone, a lipid hormone. B. Serum albumin, a large protein. C. Glucose, a simple sugar. D. Linoleic acid, a fatty acid.
When does crossing over occur?
A) Cytokinesis B) Mitosis C) Meiosis I D) Meiosis II
Members of phylum Arthropoda have paired, jointed appendages
____________________ Indicate whether the statement is true or false.