McGraw-Hill Online Learning Center Test

1. Review the image and answer the following questions.

What is the purpose in storing information in exons separated by introns?

A. It keeps the exons safe from infecting viral DNA.
B. Eukaryotes are able to then use the information in one DNA sequence in alternative ways.
C. It allows for multiple copies of instructions to be hidden within several chromosomes.
D. There appears to be no significance to this arrangement.

2. After transcription of DNA, where does processing of the initial mRNA transcript occur in the eukaryotic cell?

A. Processing occurs by RNA polymerase during the initial transcription process.
B. After transcription, enzymes process the mRNA transcript in the nucleus, removing introns.
C. After transcription and the mRNA transcript has been transported to the cytoplasm, enzymes process the mRNA transcript.
D. At the ribosome, special ribosomal enzymes process the transcript.

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