An enzyme that copies DNA to make a molecule of RNA is
A) RNA polymerase.
B) DNA ligase.
C) DNA helicase.
D) transposase.
E) DNA polymerase.
A
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Which of the following is the supportive element of hydrostatic skeletons?
A. a mineral matrix B. a hard outer covering C. a fluid-filled body cavity D. contractile proteins
The enzyme found in tears that can digest bacterial cell walls is called:a
protease. b. lysozyme. c. interferon. d. cytokine. e. defensin
Antigen-antibody complexes trapped in tissues and triggering complement activation or mast cell degranulation are characteristic of
A. type I hypersensitivity. B. type II hypersensitivity. C. type III hypersensitivity. D. autoimmunity. E. graft rejection.
Consider the cladogram shown. If we designate species 1 as the outgroup, which species has the greatest number of ancestral character states (plesiomorphies)?
A. 2 B. 3 C. 4 D. 5 E. 6