Which of the following is a true statement about the risk of getting an sti as a teen? a. teens are more vulnerable to contracting an sti because their immune systems are younger and therefore more resilient. b. teens are more vulnerable to contracting an sti because their bodies are less developed than adults. c. teens are more vulnerable to contracting an sti because they participate in less risky behaviors than adults. d. teens are more vulnerable to contracting an sti because they make up less of the total population in relation to adults.

b

Explanation:

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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.