Exam 12: Gene Structure Expression, and Mutation

In a messenger RNA, what region of the mRNA does the 3' UTR refer to?

Which region of the ribosome accepts charged tRNA molecules during the elongation phase of translation?

Some tRNAs have the ability to pair with different codons due to imprecise base pairing with the third base in the codon. How is this ability described?

For each item or event, indicate the process it is associated with. -snRNP

Suppose that a mutant organism is unable to make the amino acid arginine. Knowing that the metabolic pathway to the production of arginine is ornithine citrulline argininosuccinate arginine, you test the ability of the mutant to grow in the presence of each one of these compounds, providing just one of the compounds in each of your tests. Also suppose that you find that the mutant can grow in the presence of argininosuccinate or arginine, but NOT in the presence of citrulline or ornithine. From this information, which step in the metabolic pathway do you think is blocked?

Which of the following regions of the ribosome accept(s) charged tRNA molecules during the elongation phase of translation?

Which of the following are unique to prokaryotes?

Match each term with its definition. -start codon

Studies of arginine biosynthesis in mutant stains of Neurospora provided evidence of a direct relationship between genes and enzymes, including development of the one gene-one enzyme hypothesis. Who conducted these studies?

For each item or event, indicate the process it is associated with. -capping enzyme

Match each type of RNA with its description. -mRNA

How are protein-encoding genes in eukaryotes transcribed?

Transcription Diagram -In the transcription diagram, what is the name of item A?

For each item or event, indicate the process it is associated with. -SRP receptor

What is the most likely fate of a molecule of eukaryotic mRNA that contains no 5' cap?

For each item or event, indicate the process it is associated with. -RNA polymerase

Transcription Diagram -In the transcription diagram, what is the name of item C?

What is the function of the 5' cap in eukaryotic mRNA?

Match each term with its definition. -promoter

Which molecule becomes "charged" with an amino acid on its 3' end?