Two noncellular agents, smaller than viruses, are infectious proteins called ________ and infectious RNA strands called ________.
A. viroids; phages
B. prions; capsomeres
C. virions; prions
D. prions; viroids
E. prions; phages
Answer: D
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In the prokaryotic lac operon system, a repressor remains bound to the ____ unless lactose is present
a. operators b. promoter c. enhancer d. operon e. gene
Myoglobin is a protein found in the muscles of cetaceans that:
a. stores energy. b. stores oxygen. c. maintains buoyancy. d. maintains heat. e. stores ATP.
The mighty chestnut tree once dominated many of our Appalachian forests but was decimated by an exotic fungus in the first part of the 20th century. A few small groves of trees still remain in isolated pockets, and living roots of some of the fallen ancient trees still try to send up new shoots. These shoots always die as soon as they are exposed to the fungus. How could chestnut trees be genetically modified to be resistant to the fungus and to grow again?
What will be an ideal response?
A vaccine made from genetically engineered viruses is the basis for immunity against ____
a. small pox b. polio c. tetanus d. influenza e. cholera