The oxidation-reduction cofactor in the multisubunit enzyme fumarate reductase in E. coli which has the greatest reduction potential is
A) FAD.
B) iron clusters.
C) ubiquinone.
D) menaquinone.
E) NADH.
D) menaquinone.
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Minimal protection of specimen, personnel, and environment is accomplished with which class of biological safety cabinet?
a. Class I b. Class II c. Class III d. Class IV
Bacteria are present on the body
A. only during disease-causing infections. B. constantly. C. only in certain restricted areas. D. never.
All of the following teeth are found in adult vertebrates except
A. precanines. B. molars. C. incisors. D. premolars. E. canines.
Which statement is true of plasma membranes?
a. They have molecules on their surfaces that identify them. b. They are essentially impermeable. c. They are basically static, non-changing structures. d. They are hydrophilic barriers between cells. e. They function primarily through the activity of their carbohydrates.