Which of the following is a disadvantage of using Bt to control insects?
A. Bt does not accumulate in the soil or in nontarget animals.
B. Though not well documented it is possible for horizontal gene flow to introduce Bt genes into other plants.
C. The toxin can only be activated in target insects so it is nontoxic to mammals.
D. Bt is easily degraded in the natural environment.
Answer: B
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Various modifications in leaves can make plants better adapted to their habitats. Which of the following is not an evolutionary modification of leaves?
A. floral leaves B. fruit-bearing leaves C. spines D. reproductive leaves E. insectivorous leaves
The DNA polymerase that replicates the parental strand of DNA reads the parental DNA from 5' to 3" and makes a new DNA strand from 3' to 5'.
a. true b. false
A positive-strand RNA virus:
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