Regulatory factors that bind to enzymes ____
a. always increase enzyme activity
b. always decrease enzyme activity
c. alter the shape of the enzyme
d. alter the pH at which the enzyme works
e. alter the temperature at which the enzyme works
ANSWER: c
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L-lysine is an essential amino acid and must be supplied in the diet. By comparison, the stereoisomer D-lysine is not biologically active. Why can your body only utilize one form?
A. Since the L form and D form are enantiomers, they will bind together and inhibit utilization of the D form. B. Since the L form and D form are chiral molecules, they will bind together and inhibit utilization of the D form. C. Antibodies recognize the D form and destroy it before your body can use it for nutritional purposes. D. Enzymes can only recognize a single, specific stereoisomer.
The goal of wastewater treatment is to
A) produce potable water. B) remove pathogens from wastewater before it is released. C) reduce organic and inorganic materials in wastewater to a level that no longer supports microbial growth. D) remove pathogens from wastewater to produce potable water.
Some marine species of cyanobacteria
A. do not have flagella and are, therefore, nonmotile. B. do not have flagella but are, nonetheless, motile by some unknown mechanism. C. do not have flagella but are motile by means of pseudopods. D. have flagella and are, therefore, motile.
This apparatus was used in the primitive Earth
atmosphere simulation experiments performed by a. Stanley Miller. b. Thomas Brock. c. Australian researchers. d. Jeon Kwang. e. Lynn Margulis.