Which of the following choices represents an informal grouping of anaerobic chemoautotrophs that form ATP by removing electrons from hydrogen gas or acetate?
a. extreme thermophiles
b. extreme halophiles
c. acidophiles
d. methanogens
d
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Pyruvate is converted to acetyl CoA by a unique enzyme known as
A) pyruvate decarboxylase. B) pyruvate dehydrogenase complex. C) transitionase system. D) multiplex enzyme system. E) pyruvate CoA transferase.
Structural genes code for
A. cellular proteins. B. transfer RNA molecules. C. gene expression elements. D. ribosomal RNA molecules.
Which of the following statements is false?
a. Individuals are injected with antibodies to produce passive immunity. b. A genetically engineered virus is not as potentially dangerous as a weakened but intact pathogen. c. Allergies occur when the body makes a strong immune response to a normally harmless substance. d. Allergies are a nuisance but are never dangerous or life threatening. e. An allergic response includes the secretion of mucus, prostaglandins, and histamines.
Components of the first line of defense include all the following, except
A. nasal hairs. B. phagocytic white blood cells. C. flushing action of tears and blinking. D. flushing action of urine. E. the tough cell sheet of the upper epidermis of the skin.