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

Biology & Microbiology

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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

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The enzyme found in tears that can digest bacterial cell walls is called:a

protease. b. lysozyme. c. interferon. d. cytokine. e. defensin

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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.

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  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

Biology & Microbiology