How is enrichment bias OFTEN reduced?
a. by diluting the inoculum
b. by ensuring the medium is highly buffered
c. by maintaining high oxygenation
d. by using ecologically relevant light intensity
Answer: A
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Organisms that possess a nucleus are called prokaryotes; organisms that do not possess a nucleus are called eukaryotes
A. true B. false
Which essential macronutrient for plants is obtained directly from the air?
A) nitrogen B) magnesium C) hydrogen D) carbon
The binding of tryptophan to the Trp repressor protein results in:
A. the dissociation of the repressor from the operator sequence. B. a conformational change in the repressor that allows the repressor to bind the operator. C. the recruitment of RNA polymerase. D. an increase in the expression of tryptophan biosynthetic enzymes.
Argon has 18 protons. How many electrons are in its third energy level?
a. 2 b. 4 c. 6 d. 8 e. 10