Question

What base in mRNA can only join with the adenine base of RNA?

Answer 1

Answer:

uridine in the complementary strand joins with the base adenine because in RNA thymine is absent

Answer 2

The base in the mRna that can only which is joining with the 'adenine base' of the RNA is the uracil.

Explanation:

• Uridine in the complementary strand joins with the base adenine because in "RNA thymine" is absent.
• Uracil is one of "four nitrogenous bases" available in the RNA molecule.
• Uracil, cytosine, adenine and guanine where Deoxyribonucleic acid (DNA) which also holds each and every of this nitrogenous bases excluding that thymine is replaced for uracil.

To know more:

Difference between RNA and DNA

https://brainly.in/question/5405591