The virulence of Haemophilus influenzae serotype b is associated with its ________.
A. fimbriae.
B. neurotoxin.
C. enterotoxin.
D. capsule.
E. None of the choices is correct.
Ans: D. capsule.
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Which of the following are examples of biotechnology applications for site-specific recombination?
A. replacement of one gene allele for another on the chromosome B. deletion of a gene from the chromosome C. alteration of the linear structure of a chromosome D. insertion of a new gene into a defined location on the chromosome E. All of the choices given are correct.
Small doses of ionizing radiation over a long period of time cause less damage because
a. they are too low to affect cells. b. they don't hit as many targets. c. the body has time to repair damaged DNA. d. the radiation is absorbed by macrophages. e. the radiation is absorbed by red blood cells.
An autoimmune disease is characterized by
A) the absence of an inflammatory response. B) an insufficient or completely inactivated immune system. C) increased lysozyme enzyme concentration in saliva, tears, and mucous secretions. D) "anti-self" antibodies that can destroy some "self" cells.
How many molecules of NADH are produced during one round of glycolysis?
A) 2 B) 4 C) 6 D) 8