PCR stands for
a. polymerization copying rapidly.
b. polymerase chain reaction.
c. polymerase copy reaction.
Answer: b. polymerase chain reaction.
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A mutation is
A) a change in a DNA sequence that affects at least 90 percent of individuals in a population. B) a change in a DNA sequence that is rare in a population. C) a change in a DNA sequence that harms health. D) a type of radiation that can alter the genetic code.
Sugar dissolves when stirred into water. The sugar is the ________, the water is the ________, and the sweetened water is the ________
A) solution... solvent... solute B) solute... solvent... solution C) solvent... solute... solution D) solution... solute... solvent
A chemical is reported to inhibit bacterial replication. Bacterial cells are placed in medium with all nutrients necessary for replication. The chemical is added to the culture, and after a half hour an extract of the DNA is prepared. A significant percentage of the DNA is in pieces about 1000 to 2000 bases in length. The results are consistent with the chemical blocking the function of DNA
ligase. Indicate whether the statement is true or false
Which substance emulsifies fats in the small intestine?
A. digestive enzymes B. bile C. bicarbonate D. chymotrypsin E. hydrochloric acid