Which of the following tests can be used to distinguish Escherichia from Enterobacter?
A. Citrate utilization
B. Starch hydrolysis
C. ONPG test
D. IMVIC
Answer: D
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Nitrifying bacteria are important in the conversion of nitrogen gas to usable forms of nitrogen
Indicate whether the statement is true or false
An element is defined as a substance that:a
is composed of more than one kind of atom. b. is held together by covalent bonds. c. cannot be broken into simpler substances by chemical reactions. d. cannot burn. e. is soluble in both acid and base.
In DNA replication,
A: DNA polymerases add deoxyribonucleotides only to the 3? end of a growing strand. B: the 3? end of the primer contains a free 3?-hydroxyl group. C: the strand grows from the 3? end to the 5? end. D: Both a and b E: Both b and c
In an experiment testing the efficacy of cough syrup Brand X, researchers selected 500 participants for the study, and created a control and a placebo group. For this experiment to be considered controlled, a criterion is that:
A) the groups must contain a large number of participants to ensure statistical significance. B) no variation exists among the control group. C) no variation exists among the 500 participants. D) the variation between the participants is randomly divided into the two groups. E) the researchers must never know the group in which the participants are included.