Select the most correct answer for the following questions. Be careful to read a

Question

Select the most correct answer for the following questions. Be careful to read all the possible answers, and watch for answers like "all of the above are true". Gene expression might be altered at the level of post-transcriptional processing in eukaryotes rather than prokaryotes because of which of the following? Prokaryotic genes are expressed as mRNA, which is more stable in the cell. Eukaryotic exons may be spliced in alternative patterns. Prokaryotes use ribosomes of different structure and size. Which statement about point mutations is correct? A nucleotide substitution could change an amino acid in the polypeptide (missense). A nucleotide substitution could change an amino acid codon to a stop codon (nonsense) Many times, nucleotide substitutions do not affect which amino acid is added to the polypeptide. A frameshift mutation can cause the nucleotides downstream from the insertion or deletion, to be grouped into the wrong codons. All of the above statements are correct

Explanation / Answer

Answer:

18. (B)

In Eukaryotes alternative splicing of mRNA results in a single gene coding for multiple proteins. This mechanism does not exist in prokaryotes.

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