Question

the mrna strand is synthesized in the 5 to 3 direction. the circles in the image indicate the chemical group in which the next base is attached. which image has the circle in the correct position? a) d b) a c) c d) b

Explanation:

In mRNA synthesis, new bases are added to the 3' - OH group. Without seeing the actual images, but based on the principle of 5' to 3' synthesis and attachment at the 3' end, the circle indicating the attachment site of the next base should be at the 3' end of the growing mRNA strand.

Answer:

The option that shows the circle at the 3' end of the mRNA - like structure (assuming the strand is oriented 5' to 3') is the correct one. Since no images are provided, we cannot definitively choose a, b, c, or d. But if one of them shows the circle at the 3' end, that is the answer.