Exam 13: Gene Structure and Expression

Which of the following best defines what occurs during transcription?

-Suppose that an mRNA molecule is made complementary to this DNA sequence: 3'-CTTACATGGCATCC-5'. In the genetic code table, the incorporation of which amino acid in the polypeptide is directed by the third codon (counting the start codon as the first codon)?

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

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

Where does precursor-mRNA (pre-mRNA) typically exist?

In which complex does the process of removing introns from mRNA and putting the remaining exons together occur?

Which enzyme performs the DNA unwinding function during transcription elongation?

In the expression of the gene for insulin, which is secreted outside certain mammalian cells, which of the following steps will occur last?

Suppose that the first part of a new polypeptide chain being produced in a eukaryotic cell has a signal peptide. Where would this polypeptide be located within the cell as it is maturing?

-What does the structure in the figure represent?

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

Describe the process of transcription in prokaryotes.

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

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

During translation, where does the energy for translocation come from?

Match each type of RNA with its description. -pre-mRNA

In the genetic code table, the incorporation of which amino acid is directed by the start codon for translation?

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

Suppose that a DNA change results in the substitution of one codon for another, but the codon specifies the same amino acid as it did originally. What type of mutation has occurred?

Which site on a ribosome does the release factor bind to?