The time required for a control agent to kill 90% of the microorganisms or spores in a sample under specified conditions is called
A) The contact time
B) The D value
C) The Z value
D) None of the above
Ans: B) The D value
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Four of the five answers listed below are carbohydrates. Select the exception
a. glycerol b. cellulose c. starch d. sucrose e. glycogen
Most hormones are distributed throughout the body by the
a. exocrine system. b. lymphatic system. c. nervous system. d. blood system. e. integumentary system.
A controlled experiment _____
A) is repeated many times to ensure that the results are accurate B) includes at least two groups, one of which does not receive the experimental treatment C) includes at least two groups, one differing from the other by two or more variables D) includes one group for which the scientist controls all variables
In an experiment, the group used as a basis of comparison is the
A. control group. B. experimental group. C. empirical group. D. variable group.