Which best explains why an mri is useful for diagnosing cancer but ineffective in treating it? the frequency of the radio waves used is so high that the waves cannot be used to target specific cells. the wavelength of the radio waves used is so short that the waves cannot be used to target specific cells. the amount of energy carried by radio waves is enough to provide images but not enough to kill cells. the amount of energy carried by radio waves is so high that it provides images but can also damage cells

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.

-hails tea

explanation:

-t poses