Asap (15 points)

in which of the following ways are the conditions around deep sea vents similar to the conditions that existed on early earth?

a) only ultraviolet light can reach the depth of the deep sea vents making it much like the light on early earth.
b) the volcanic gases released from the deep sea vents are similar to those released into the early atmosphere.
c) water around the deep sea vents contains low concentrations of iron sulfide just as the early oceans did.
d) the water at the depth of the deep sea vents were as cold as the early oceans.

the correct option is option a

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.