Deamination is a spontaneous DNA mutation that converts cytosine to

A) thymine.
B) guanine.
C) adenine.
D) uracil.
E) None of these are correct.


Answer: D

Biology & Microbiology

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You are walking along the beach and see the remains of an unknown animal washed up on shore. You examine its characteristics and see that it is gelatinous, transparent, bilaterally symmetric, and lacks tentacles. You provisionally identify its phylum according to which choice?

a. Gelatinous body rules out Cnidaria. b. Lack of tentacles rules out Cnidaria. c. Bilateral symmetry rules out Platyhelminthes. d. Transparent body rules out Ctenophora.

Biology & Microbiology

The suffix -emia means ________.

A. pertaining to B. tumor C. an inflammation D. blood E. a disease or morbid process

Biology & Microbiology

What catalyzes the unwinding of the DNA double helix during DNA replication?

a. topoisomerase b. primase c. DNA polymerase d. helicase

Biology & Microbiology

The protozoan that causes malaria is an intracellular parasite of red blood cells (RBCs). An adaptive immune response to this parasite is problematic because

A. red blood cells do not produce MHC and, therefore, do not display the fact that they have been infected by presenting antigen. B. the parasite damages leukocytes along with RBCs. C. RBCs normally produce cytokines necessary for adaptive immune response, which this infection prevents. D. complement cannot effectively destroy RBCs. E. RBCs never enter lymphoid tissue.

Biology & Microbiology