Directions
Based on what you have learned about the lives of stars, draw either separate posters or a single poster showing the life
histories of two stars--a Sun-sized star (1.0 solar mass) and a star of 15 solar masses. You can either use pencils/markers
and posterboard or a graphics program to make your poster(s). After you have completed your posters, respond to the
questions below.

answer: b: experiments that showed that all cells are similar in how they metabolize and in their composition

explanation:

is this for the e2020 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.