The use of selected culture media and incubation conditions to isolate microorganisms from samples is known as a(n)
A) differential culture.
B) selective culture.
C) enrichment culture.
D) sensitive culture.
Answer: C
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The purity of illicit drugs varies, so
a) drugs should be tested to ensure purity. b) some drugs may not harm the fetus. c) drug users can never be sure what they are ingesting. d) they do not pose risks to the fetus.
When MSH2 and MLH1 are inactivated by mutation, DNA repair is defective and ____________________ mutation rates increase by at least 100-fold
Fill in the blank(s) with correct word
The two strands of a DNA double helix are said to be antiparallel. This means that ____
a. the 5' end of one strand is directly paired with the 5' end of the other strand b. since the double helix twists, it is not perfectly parallel c. one strand has a negative charge and the other strand has a positive charge
d. the 5' end of one strand is directly paired with the 3' end of the other strand e. both strands have a negative charge
Laboratory techniques that exclude unwanted microbes are called __________.
A) ubiquitous B) aseptic C) invisible D) manipulations