Quaternary ammonium compounds are
A.
cationic detergents that help wash surfaces.
B. attracted to the negative charge on the microbial cell surface.
C. used as a 37% aqueous solution.
D. very effective against Pseudomonas.
E.
cationic detergents that help wash surfaces AND attracted to the negative charge on the microbial cell surface.
E
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Three critical amino acids in the active site of an enzyme are arginine, lysine, and histidine. Which of the following characteristics would you predict the substrate to possess in order to bind the active site of this enzyme?
A. relatively hydrophobic B. hydrophilic, with a negative charge C. hydrophilic, with a positive charge D. hydrophilic, but without a charge
Gel electrophoresis separates DNA fragments based on:
A. nucleotide sequence. B. length. C. mutations. D. replication rate. E. primers.
The ________ zone is a range of environmental temperatures within which homeothermic metabolic rates are minimal
Fill in the blank(s) with correct word
The outer living limit of the cell is called the:
A) edge. B) plastid. C) plasma membrane. D) cell wall.