The E. coli lac operon encodes three genes. These genes
a. cleave lactose into glucose and galactose, produce transacetylase, and actively transport
lactose into the cell.
b. encode for an enzyme that cleaves glucose, a transport protein for active transport, and a
transacetylase enzyme for solubilizing lactose in the cytosol.
c. encode for an enzyme that cleaves lactose, a transport protein for active transport of
lactose, and a transacetylase enzyme whose function is still unknown.
d. catalyze the synthesis of lactose from glucose and galactose, produce transacetylase, and
actively export lactose from the cell.
e. directly interact with the lac repressor and initiate their own transcription.
C
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What does the term theory mean to a scientist?
A. A proposed explanation for an observed phenomenon B. A hypothesis that has been supported by a large number of experiments C. A hypothesis that has been supported by the evidence of one experiment D. A guess
Humans have disrupted the nitrogen cycle primarily by ____
a. irrigation b. cutting down forests c. using nitrogen-containing fertilizers d. crop rotation e. leaching
The human body requires about ____ of fat
each day to stay healthy.
a. 1 teaspoon b. 4 teaspoons c. 1 tablespoon d. 4 tablespoons e. 1 cup
During the Proterozoic period photosynthetic cells
caused a. changes in the course of evolution due to production of oxygen. b. massive extinctions due to the production of chemical neurotoxins. c. the color of the oceans to change from blue to green. d. land formation due to the sediment buildup in shallow seas. e. none of these.