Use the following diagram of an mRNA molecule to answer questions 28-30 5. 1. 2.

Question

Use the following diagram of an mRNA molecule to answer questions 28-30 5. 1. 2. AUG AUG AUG UGA 6. UAG UA 3. 28. This mRNA would be found in a(n)? a. Prokaryote b. Eukaryote 29. The regions labeled with number 5 are? a. Ribosome binding sites b. Initiator codons c. 3' untranslated regions d. 5' untranslated regions e. Protein coding regions 30. The region labeled with number 1 is a(n)? a. Ribosome binding site b. Initiator codon c. 3' untranslated region d. 5' untranslated region e. Protein coding region 31. Which of the following statements about the Lac operon is FALSE? a. The Lac repressor binds when lactose is present in the cell b. Even when the CAP activator is bound to DNA, if lactose is not present, the Lac operon will not be transcribed c. The CAP activator can only bind DNA when it is bound to cAMP d. The Lac operon only produces RNA when lactose is present and glucose is absent

Explanation / Answer

28. a. prokaryotes.

The figure shows a polycistronic mRNA that belongs to prokaryotes.

29. e. Protein coding regions.

Since the region is preceded by aug and ends in stop codon UAG, so it is a protein-coding region.

30. d. 5' untranslated region.

This region lies just before the first exon and is not translated.

31. a. The Lac repressor binds when lactose is present in the cell.

The lac repressor can only bind to the operator when lactose is absent in the medium.

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