What is the advantage of genetically modifying crops such as corn, cotton, and potatoes with Bt genes?

A) to make the crops more resistant to insect pests
B) to improve the resistance of insect pests to Bt toxins
C) to reduce the need for fertilizers
D) to stop Bacillus thuringiensis from damaging the crops


Answer: A

Biology & Microbiology

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Indicate whether the statement is true or false.

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Which of the following is a concept NOT

shared by Larmark and Darwin in their theories of evolution?

a. gradual change of species over time b. environmental pressures result in changes in populations of species over time c. a drive for perfection leads to changes in species over time d. all of these ARE concepts shared by Larmark and Darwin in their theories of evolution e. none of these are concepts shared by Larmark and Darwin in their theories of evolution

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Two or more alleles of a gene present at relatively high frequencies in a population’s gene pool is known as ____

a. disruptive selection b. sexual dimorphism c. directional selection d. stabilizing selection e. balanced polymorphism

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Which structure contains the photoreceptors in the human eye?

1.choroid 2.cornea 3.pupil 4.retina

Biology & Microbiology