As a child, you contracted hand, foot, and mouth disease, which is caused by a virus. several years later, your sibling also contracted the same virus. why don't you get sick a second time?

you have antibodies that already recognize the virus.
white blood cells released histamines and killed the virus.
your skin prevented the virus from entering your body.
stomach acid inactivated the virus, preventing its spread.

i do not know and i have a 100 in this class

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.