The most inclusive level of organization listed
here is a(n)
a. heart.
b. carbon atom.
c. DNA.
d. a zebra.
e. red blood cell.
D
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Mutation rates are similar in Bacteria and Archaea, yet certain stressful conditions mutation rates increase. Why is the mutation rate not constant and close to zero all of the time?
A) Increased mutation rates can be advantageous in rapidly changing environments because some random mutations may be useful for survival. B) Microorganisms carefully control the mutation rate of their DNA to match the environmental conditions and maximize evolution. C) The increased mutation rate under stressful conditions is an indication that the microorganisms can no longer replicate their DNA properly and are about to die. D) Constant mutation rates would halt evolution completely.
Which direction would you turn Z-DNA to introduce negative super coils?
A. Right B. Left
The gametophyte is green and nutritionally independent in
A. mosses, liverworts, and ferns. B. angiosperms. C. gymnosperms. D. tracheophytes. E. seed plants.
Humans may contact psittacosis by
A. handling infected birds. B. handling infected birds and the dried excreta of birds. C. consuming undercooked chicken. D. inhaling excreta of dried birds.