bradley loved peanut butter sandwiches. he noticed that every time he tried to put the peanut butter on white bread, the bread would tear apart. which would be a good question to guide a scientific investigation on the topic?

a)
why is peanut butter hard to spread?

b)
peanut butter on wheat bread is easiest to spread.

c)
does the brand of peanut butter influence the ease of spread?

d)
if the bread is wheat instead of white, then the bread will not tear.
eliminate

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.