Answer:
Option C
Explanation:
The complete question is
Which events occurs directly after rna polymerase recognizes the transcription start site of a gene?
a. The polymerase strings amino acids into a polypeptide.
b. A complementary RNA strand detaches itself from the DNA.
c. The DNA strand begins to unwind, separating the two strands.
d. Free-floating nucleotides pair up with exposed DNA bases.
Solution
After the RNA polymer has recognized the transcription site, it can start transcribing the target gene. The RNA polymerase can now open the DNA and separate the strands. It prefer to open the strand from the A and T base pair as they have two hydrogen bonds as compared to C and G pair which has three hydrogen bonds. This usually occurs at the -10 place.
Hence, option C is correct
