Exam 17: From Gene to Protein

A transcription unit that is 8000 nucleotides long may use 1200 nucleotides to make a protein consisting of approximately 400 amino acids.This is best explained by the fact that

The process of translation,whether in prokaryotes or eukaryotes,requires tRNAs,amino acids,ribosomal subunits,and which of the following?

When translating secretory or membrane proteins,ribosomes are directed to the ER membrane by

A particular triplet of bases in the template strand of DNA is 5' AGT 3'.The corresponding codon for the mRNA transcribed is

Which of the following is the first event to take place in translation in eukaryotes?

Which of the following variations on translation would be most disadvantageous for a cell?

A new chemical food additive is developed by a cereal manufacturer.Why do we test for its ability to induce mutation?

The following questions refer to this table of codons. -If a nucleotide substitution switched a U for a C,such that the codon was read as CGC instead of CGU,what would the effect be?

During splicing,which molecular component of the spliceosome catalyzes the excision reaction?

Which of the following statements best describes the termination of transcription in prokaryotes?

Which of the following is not true of a codon?

The following questions refer to this table of codons. -A possible sequence of nucleotides in the template strand of DNA that would code for the polypeptide sequence phe-leu-ile-val would be

Which small-scale mutation would be most likely to have a catastrophic effect on the functioning of a protein?

Which components of 5' UTR E₁ I₁ E₂ I₂ E₃ I₃ E₄ UTR 3' will also be found in mRNA in the cytosol?

A mutant bacterial cell has a defective aminoacyl synthetase that attaches a lysine to tRNAs with the anticodon AAA instead of the normal phenylalanine.The consequence of this for the cell will be that

Changes in a single nucleotide pair within a gene is called

How does a plasma membrane protein become imbedded in the membrane?

A particular triplet of bases in the coding sequence of DNA is AAA.The anticodon on the tRNA that binds the mRNA codon is

In an experimental situation,a student researcher inserts an mRNA molecule into a eukaryotic cell after he has removed its 5' cap and poly-A tail.Which of the following would you expect him to find?

When the ribosome reaches a stop codon on the mRNA,no corresponding tRNA enters the A site.If the translation reaction were to be experimentally stopped at this point,which of the following would you be able to isolate?