Which of the following is the correct sequence of PCR?
A) Heat to 70°C (to separate DNA) , then cool to 50°C (to bind primers and enzymes) , and then reheat to 90°C (to synthesize DNA) .
B) Heat to 90°C (to separate DNA) , then cool to 50°C (to bind primers and enzymes) , and then reheat to 70°C (to synthesize DNA) .
C) Heat to 70°C (to bind primers and enzymes) , then cool to 50°C (to synthesize DNA) , and then reheat to 90°C (to separate DNA) .
D) Heat to 90°C (to bind primers and enzymes) , then cool to 50°C (to separate DNA) , and then reheat to 70°C (to synthesize DNA) .
F) A) and B)
Correct Answer
verified
Correct Answer
verified
Which of the following is a valid scientific concern about the environment and transgenic crops?
A) Wild animals might eat the transgenic crops and become genetically mutated.
B) The toxic products of the modified genes would be released to the environment when the plants die, resulting in drastic die-offs of local wildlife.
C) Eating transgenic foods will permanently change human DNA.
D) Pollen from transgenic crops could carry the recombinant genes to wild relatives, with unpredictable consequences.
F) All of the above
Correct Answer
verified
Correct Answer
verified