Which major digestive process involves nutrient molecules passing across the mucosal layer of the gastrointestinal tract into the blood or lymph?
A) elimination
B) absorption
C) digestion
D) secretion
E) mechanical processing and movement
B
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Replica plating
A. is useful for direct selection. B. is useful for identifying auxotrophs. C. uses media on which the mutant will not grow and the parental cell typewill. D. is used to store strains of bacteria. E. is useful for identifying auxotrophs AND uses media on which the mutant will not grow and the parental cell typewill.
Prions differ from viroids in that they are
a. made up of DNA. b. circular RNA surrounded with protein. c. linear DNA surrounded with lipid. d. circular RNA with no protein coat. e. single proteins.
A positive direct ELISA result requires
A. one known antibody, one unknown antibody, and an unknown antigen. B. two known antibodies and one unknown antigen. C. two known antibodies and one known antigen. D. one known antibody, one unknown antibody, and a known antigen.
The evolution of aerobic respiration ____ both oxygen and carbon dioxide levels in the biosphere
a. mutated b. stabilized c. increased d. decreased e. eliminated