The first amino acid incorporated into any bacterial protein Question Blank 1 of 1
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In bacterial cells, protein synthesis begins with the translation of mRNA into a polypeptide chain. Show more…
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QUESTION 1 Which of the following is translated in the rough ER? A growth factor receptor ras Rb Ribosomal proteins QUESTION 2 Which of the following is required for post-translational import? A signal peptide A signal recognition particle (SRP) SRP receptor All of the above None of the above QUESTION 3 Which of the following is translated in the rough ER? Hexokinase, the first enzyme in glycolysis Citrate synthase, the first enzyme in the Citric Acid Cycle The signal recognition particle Pancreatic digestive enzymes QUESTION 4 Which of the following types of mutations has the HIGHEST probability of changing a SINGLE amino acid in the encoded protein, not changing any of the remaining amino acids? A point mutation in the 3rd base of a codon A single nucleotide deletion A point mutation in the 1st base of a codon A point mutation in the 2nd base of a codon QUESTION 5 What is an advantage of a degenerate genetic code? Mutations are more likely to alter proteins, increasing the rate of evolution. Mutations are less likely to alter protein sequence, decreasing the chances that a mutation will have deleterious consequences to the organism. It increases the number of different proteins that can be coded by each gene. It decreases the total number of tRNAs that have to be made. QUESTION 6 Which of the following types of mutations is LEAST likely to affect the function of the encoded protein? A point mutation in the 2nd base of a codon A point mutation in the 1st base of a codon A single nucleotide deletion A point mutation in the 3rd base of a codon QUESTION 7 In addition to ribosomes, mRNA, and tRNA, what else must you add to a cell-free reaction system in order for the mRNA to be translated? ATP GTP All 4 RNA nucleotides Heat QUESTION 8 In a certain mutant strain of bacteria, the enzyme Leucyl-tRNA Synthetase mistakenly attaches isoleucine to leucyl-tRNA instead of attaching leucine. The result would be that: Protein synthesis will stop at the first leucine codon, because the incorrectly-matched tRNAs will not be recognized by the ribosome. Protein synthesis will be normal, because the ribosome reads the mRNA and selects the tRNA based on the attached amino acid. Proteins will have leucine inserted in positions normally occupied by isoleucine. Proteins will have isoleucine inserted in positions normally occupied by leucine. QUESTION 9 Shown below are partial tRNA sequences with anticodons underlined. Which of these is tRNA #1, bringing the first amino acid to the ribosome during translation initiation? 5' - A U A U G A G U U C G - 3' 5' - A U A U A U G U U C G - 3' 5' - A U A U C A U U U C G - 3' none of the above QUESTION 10 Which of the following decides which amino acid corresponds to which 3-base nucleotide sequence and can therefore be said to be responsible for translating the nucleic acid code? tRNAs The ribosome tRNA Synthetase
Adi S.
QUESTION 6 Which of the following is REQUIRED FOR co-translational import? A signal peptide A signal recognition particle (SRP) SRP receptor All of the above None of the above QUESTION 7 Which of the following is translated in the rough ER? Hexokinase, the first enzyme in glycolysis Citrate synthase, the first enzyme in the Citric Acid Cycle The signal recognition particle Pancreatic digestive enzymes QUESTION 8 Which of these amino acids should be most likely to rely on tRNAs containing inosine? (i.e. which amino acids are likely to rely on wobble; to answer this question refer to slide 17 lecture 37 or slide 5 lecture 39) Alanine (Ala) Arginine (Arg) Aspartic acid (Asp) Asparagine (Asn) QUESTION 9 Which of the following types of mutations is LEAST likely to affect the function of the encoded protein? A point mutation in the 2nd base of a codon A point mutation in the 1st base of a codon A single nucleotide deletion A point mutation in the 3rd base of a codon QUESTION 10 Which of the following types of mutations has the HIGHEST probability of changing a SINGLE amino acid in the encoded protein, not changing any of the remaining amino acids? A single nucleotide deletion A point mutation in the 3rd base of a codon A point mutation in the 2nd base of a codon A point mutation in the 1st base of a codon
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1.) During the formation of a peptide bond, the attacking atom is: carbon oxygen hydrogen nitrogen 2.) What is an iron response element? A protein A segment of DNA A section of RNA that codes for protein A particular RNA structure 3.) Proteins are synthesized starting with _____________. alanine the 5' end the carboxy terminus the amino terminus 4.) The actual three-dimensional structure of tRNA is a(n): L-shape. cloverleaf. twisted triple helix. All of the above. None of the above. 5.) Streptomycin is an effective antibiotic because _____________. it inhibits protein synthesis in prokaryotes it does not affect eukaryotes both neither 6.) Which of the following amino acids is encoded by only one codon? phenylalanine alanine methionine aspartate None of the above.
Shaiju T.
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