Which of the following causes mutations by creating thymine dimers?
A. nucleotide analogs
B. nitrous acid
C. ultraviolet light
D. benzopyrene
E. gamma rays
Answer: C
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Killer lymphocytes can elicit self-destruct mechanisms in target cells by interacting with
A) Fas ligand. B) Fas receptors. C) Ras ligand. D) adaptor proteins. E) procaspase.
Almost all of the antibodies found in a newborn are
A. the result of infection. B. self-made. C. IgM. D. the result of passive immunity.
A species that is sensitive to environmental change and that can be monitored to determine the health of an ecosystem is a(n) ________
a. endangered species only b. indicator species only c. all of the choices d. threatened species only
Which one of the following is not an alveolate:
1.coccolithophores 2.dinoflagellates 3.ciliates 4.apicomplexans