Question

Which step in transcription occurs first? mRNA moves the code from the nucleus to the ribosome for protein production. A gene is expressed through protein production. RNA polymerase attaches to the promoter. A repressor protein must attach to the operator.

Answer 1

Answer: RNA polymerase attaches to the promoter

Explanation:Took the test

Answer 2

The first step that occurs in transcription is that RNA polymerase attaches to the promoter.

What is RNA?

• RNA stands for ribonucleic acid.
• It is single stranded.
• Nucleotide consists of: ribose sugar, phosphate group and nitrogenous bases.
• Nitrogenous bases are of two types: Purines and Pyrimidines.
• Purines consists of Adenine and Guanine.
• Pyrimidines consists of Cytosine and Uracil.
• Adenine pairs with Uracil whereas Guanine and Cytosine.

What do you mean by transcription?

• "The process in which a gene's DNA sequence is copied (transcribed) to make an RNA molecule is called transcription."
• It begins when RNA polymerase binds to the promoter (a upstream sequence of DNA when binds to a specific enzyme initiates transcription) sequence of a gene.
• RNA polymerase is an DNA dependent enzyme used for the synthesis of RNA from DNA.

Hence, the correct answer is: RNA polymerase attaches to the promoter.

To know more about transcription here

https://brainly.com/question/16945337

#SPJ2