During processing of pre-mRNA to mature mRNA, which changes occur?

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Study for the A2 Genetic Control of Proteins Test. Engage with flashcards and multiple choice questions, each question is accompanied by hints and explanations. Prepare thoroughly for your exam!

Multiple Choice

During processing of pre-mRNA to mature mRNA, which changes occur?

Explanation:
During processing of pre-mRNA to mature mRNA, three major changes take place in eukaryotes: a 5' cap is added to the transcript, introns are removed and exons are joined through splicing, and a poly-A tail is added to the 3' end after cleavage. The 5' cap protects the RNA from degradation and helps ribosomes recognize the mRNA for translation. Splicing creates a continuous coding sequence by removing noncoding introns and linking exons together. The poly-A tail enhances stability, aids export from the nucleus, and improves translation efficiency. Because all three modifications occur, the mature mRNA contains these features, so all of the above is the correct answer.

During processing of pre-mRNA to mature mRNA, three major changes take place in eukaryotes: a 5' cap is added to the transcript, introns are removed and exons are joined through splicing, and a poly-A tail is added to the 3' end after cleavage. The 5' cap protects the RNA from degradation and helps ribosomes recognize the mRNA for translation. Splicing creates a continuous coding sequence by removing noncoding introns and linking exons together. The poly-A tail enhances stability, aids export from the nucleus, and improves translation efficiency. Because all three modifications occur, the mature mRNA contains these features, so all of the above is the correct answer.

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