The group mollusks includes:
A. gastropods and cephalopods.
B. sponges and placozoans.
C. crustaceans and bivalves.
D. starfish and cephalopods.
A
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Which one of the following represents the pH of a solution with the highest concentration of hydrogen ions?
A. 1.0 B. 4.5 C. 7.0 D. 9.1 E. 11.5
Most peptic ulcers are caused by ____
a. antibiotics b. bacteria c. heartburn d. lactose intolerance e. malnutrition
The intermediate disturbance hypothesis posits which of the following?
a. Species richness is greatest in communities that experience infrequent moderate disturbances. b. Species richness is greatest in communities that experience high temperatures. c. Species richness is greatest in communities that experience frequent severe disturbances. d. Species richness is greatest in communities that experience frequent moderate disturbances. e. Species richness is greatest in communities that experience intense disturbances.
A repressible operon is usually controlled by:
a. an inactive repressor that allows it to be in the "on" state. b. the supply of the precursor product for the enzymes. c. an inactive repressor that keeps it in the "off" state. d. tryptophan. e. being turned "on," usually by the end product of the pathway.