The citizens of a town are aware of climate change, and they want to make changes to control it. one change they consider is replacing the nearby thermal power plant with a hydroelectric plant. if they want to make sure this change will to slow climate change, which question should they ask?

is it less expensive to build a hydroelectric power plant than a thermal power plant?

does a hydroelectric power plant employ fewer people than a thermal power plant?

does a hydroelectric power plant emit less co2 than a thermal power plant?

is the cost of operating a hydroelectric power plant less than the cost of running a thermal power plant?

step 1: initiation

initiation is the beginning of transcription. it occurs when the enzyme rna polymerase binds to a region of a gene called the promoter. this signals the dna to unwind so the enzyme can ‘‘read’’ the bases in one of the dna strands. the enzyme is now ready to make a strand of mrna with a complementary sequence of bases.

step 2: elongation

elongation is the addition of nucleotides to the mrna strand. rna polymerase reads the unwound dna strand and builds the mrna molecule, using complementary base pairs. there is a brief time during this process when the newly formed rna is bound to the unwound dna. during this process, an adenine (a) in the dna binds to an uracil (u) in the rna.

step 3: termination

termination is the ending of transcription, and occurs when rna polymerase crosses a stop (termination) sequence in the gene. the mrna strand is complete, and it detaches from dna.