An essential amino acid is best defined as one that:
A. cannot be synthesized by cellular
biochemical pathways.
B. is necessary for building proteins.
C. cannot be obtained through the diet.
D. functions as a vitamin.
E. is required in large amounts.
A
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The ____ of an atom have no charge
a. electrons b. protons c. neutrons d. ions e. nuclei
A student drops his notes, and his papers scatter. The fact that the papers scatter and do not remain neatly stacked is an illustration of
A) the first law of thermodynamics. B) the second law of thermodynamics. C) an increase in entropy. D) both the first and second laws of thermodynamics. E) an increase in entropy as predicted by the second law of thermodynamics.
In E. coli, ? DNA integrates into which site on the bacterial chromosome?
A) ori B) trp C) bio D) gal E) att
Vectors such as pUC18 and others of the pUC series contain a large number of restriction enzyme sites clustered in one region. Which term describes this advantageous arrangement of restriction sites?
A) multiple cloning site B) ?-galactosidase C) complementation D) palindrome E) consensus sequence