Part A rRNA has an enzymatic role in all stages of protein synthesis. True False Submit Request Answer Provide Feedback
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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
Sri K.
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.
What part of an amino acid is the radical group attached to? alpha carbon amino group carboxyl group beta carbon The amino acids in proteins are joined together by _____ bonds. ionic hydrogen acetyl oxygen peptide Peptide bonds between these functional groups allows amino acids to polymerize any of the combinations listed here alpha carbons and carboxyl groups radical groups and carboxyl groups alpha carbons and amino groups amino and carboxyl groups The amino acid sequence of a polypeptide is referred to as the _____ sequence of the polypeptide. quaternary secondary primary tertiary All of these answers are correct Which of the following statements is FALSE? Tertiary structure is not dependent on secondary structure Primary structure is not dependent on secondary structure Quaternary structure is dependent on the interactions between polypeptides Secondary structure is dependent on primary structure Which of the following statements is FALSE? A peptide's secondary structure is dependent on its primary structure All of these statements are true. A peptide's tertiary structure is dependent on its secondary structure A peptide's primary structure is dependent on its secondary structure An anticodon would be found on which of these molecules? Amino acid tRNA rRNA mRNA DNA If codons had only two positions, how many amino acids could they encode? none 14 4 16 24 The genetic code is degenerate, this means Every amino acid is encoded for by the same number of codons It breaks down over time There is only ever one type of stop codon One amino acid can be encoded by multiple codons All of these statements are true To translate an mRNA requires two other types of RNA. These are: all of these answers are correct tRNA and miRNA. tRNA and rRNA. tRNA and more mRNA. snRNA and snoRNA. rRNA and siRNA. Which of the following statements about translation is CORRECT? The codon for methionine appears only at the beginning of the mRNA for a protein, not in the middle or in the end. In eukaryotes, the 5′ cap and the 3′ poly(A) tail are involved in translation initiation. A special tRNA that does not have an attached amino acid binds to stop codons to terminate translation. None of these answers are correct Ribosomes move along an mRNA in the 3′ to 5′ direction. The first three bases at the 5′ end of an mRNA are the AUG at which translation begins Codons that specify the same amino acid are said to be: wobbly. All of these answers are correct anonymous. synonymous. isoaccepting. hypothetical. The ribosome facilitates decoding by inducing the binding of complementary _____________ anticodon sequences to ___________ codons. rRNA/ tRNA mRNA/ tRNA rRNA/ mRNA tRNA/ mRNA None of these answers are correct Which of the following statements describes “wobble” CORRECTLY? The number of the genetic code exceeds the number of amino acids available in the cell. The third base pairing between the tRNA and mRNA is relaxed. All of these answers are correct There are multiple codons that may code for the same amino acids. There is a flexible pairing between tRNA and amino acid as there are more tRNAs than the number of amino acids. There are multiple tRNAs that may bind to the same amino acids. An mRNA has the stop codon 5′ UAA 3′. What tRNA anticodon will bind to it? 5′ ACU 3′ 5′ AUC 3′ 5′ ATT 3′ None of these answers are correct 5′ UUA 3′ During initiation, the _____ subunit is the first part of the ribosome to associate with the mRNA. None of these answers are correct tertiary large intermediary small secondary During elongation, an incoming charged tRNA enters at the _____ site of the ribosome. Shine–Dalgarno Kozak peptidyl (P) aminoacyl (A) exit (E) Which of the following is observed in prokaryotes but not in eukaryotes? The 5′ end of a prokaryotic mRNA can be translated while the 3′ end is still being transcribed. Translation does not require any protein factors in prokaryotes. An mRNA can be translated by only one ribosome at a time in prokaryotes. In prokaryotes, ribosomes move along an mRNA in the 3′ to 5′ direction. UGG is an example of a stop codon only found in prokaryotes. Which of the following statements about translation is CORRECT? The first three bases at the 5′ end of an mRNA are the AUG at which translation begins. In eukaryotes, the 5′ cap and the 3′ poly(A) tail are involved in translation initiation. The codon for methionine appears only at the beginning of the mRNA for a protein, not in the middle or in the end. Ribosomes move along an mRNA in the 3′ to 5′ direction. A special tRNA that does not have an attached amino acid binds to stop codons to terminate translation. Translation requires .... Elongation The initiation of translation The binding of amino acids to transfer RNAs All of the steps listed here Termination Which of the following statements regarding translation initiation is FALSE? None, these are all true In Eukaryotes the Kozak sequence in eukaryotic cells facilitates the identification of the start codon. In Eukaryotes the 3’ Cap is recognized by the small subunit of ribosome. In Bacterial Cells the Shine–Dalgarno consensus sequence is recognized by the small subunit of the ribosome. In Bacterial Cells the 3’ Cap is recognized by the large subunit of ribosome. During initiation ... a tRNA binds to the mRNA in the A-site of the ribosome a tRNA is bound to the A and E sites All of these answers are correct a tRNA is bound to the A and P sites a tRNA binds to the mRNA in the P-site of the ribosome a tRNA binds to the mRNA in the E-site of the ribosome During Elongation ... All of these answers are correct A peptide bond is formed between the amino acids in the P and A sites The ribosome moves down the mRNA to the next Codon The tRNA that was in the E-site is released The tRNA in the P site releases its amino acid Termination ... only occurs when the ribosome encounters an AUG codon All of these statements are true is repeated multiple times during the translation of a single peptide involves the binding of release factors, not a tRNA, to a stop codon does not require GTP RNA translation is sometimes inhibited None of these answers are correct long non-coding RNAs small interfering RNAs short nucleolar RNAs microRNAs
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