Biology: The Dynamic Science (MindTap Course List)
4th Edition
ISBN: 9781305389892
Author: Peter J. Russell, Paul E. Hertz, Beverly McMillan
Publisher: Cengage Learning
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Chapter 15, Problem 4TYK
Summary Introduction
Introduction:
Translation is the process in which the
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Which of the following is/are required in the amino acid activation by aminoacyl-tRNA synthetase?
A. tRNA
B. Mg2+
C. GTP
D. mRNA
E. amino acid
F. ATP
G. rRNA
Which of the following is not true?
A.) A single activating enzyme can interact with all the tRNAs for its corresponding amino acid
B.) The selectivity of the aminoacyl-tRNA sunthetases for their tRNA molecules is oftern called the second Genetic code
C.) There are two major classes of aminoacyl-tRNA syntetases
D.) Aminoacyl-tRNA synthetases link amino acids to tRNA molecules without the need for an energy source
All of the following apply to tRNAs EXCEPT: (more than one may apply)
A. attach amino acids at the 5’ end
B. have stems and loops
C. are all encoded by a single gene
D. an anti-codon of 5’AAC3’ corresponds to a codon of 3’UUG5’
E. exhibit distinctive 3D folds
F. are acted on by 64 different aminoacyl synthetases
G. are charged with amino acids by peptidyl transferase
Chapter 15 Solutions
Biology: The Dynamic Science (MindTap Course List)
Ch. 15.1 - Prob. 1SBCh. 15.1 - If the codon were five bases long, how many...Ch. 15.2 - For the DNA template below, what would be the...Ch. 15.2 - Prob. 2SBCh. 15.3 - Prob. 1SBCh. 15.3 - Prob. 2SBCh. 15.4 - Prob. 1SBCh. 15.4 - Distinguish between the P, A, and E sites of the...Ch. 15.4 - Prob. 3SBCh. 15.5 - How does a missense mutation differ from a silent...
Ch. 15.5 - Prob. 2SBCh. 15.5 - Prob. 3SBCh. 15.5 - Prob. 4SBCh. 15 - Eukaryotic mRNA: usessnRNPs to cut out introns and...Ch. 15 - A segment of a strand of DNA has a base sequence...Ch. 15 - Prob. 3TYKCh. 15 - Prob. 4TYKCh. 15 - Which of the following statements is false? a. GTP...Ch. 15 - Prob. 6TYKCh. 15 - Prob. 7TYKCh. 15 - Prob. 8TYKCh. 15 - Prob. 9TYKCh. 15 - A part of an mRNA molecule with the sequence 5-UGC...Ch. 15 - Discuss Concepts A mutation occurs that alters an...Ch. 15 - Discuss Concepts The normal form of a gene...Ch. 15 - Prob. 13TYKCh. 15 - Prob. 14TYKCh. 15 - Prob. 15TYKCh. 15 - Prob. 16TYKCh. 15 - Prob. 17TYKCh. 15 - Prob. 1ITD
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- In bacteria, researchers have isolated strains that carry mutations within tRNA genes. These mutations can change the sequence of the anticodon. For example, a normal tRNATrp gene encodes a tRNA with the anticodon 3′–ACC–5′. A mutation can change this sequence to 3′–CCC–5′. When this mutation occurs, the tRNA still carries a tryptophan at its 3′ acceptor stem, even though the anticodon sequence has been altered. A. How would this mutation affect the synthesis of polypeptides within the bacterium? B. What does this mutation tell you about the recognition between tryptophanyl-tRNA synthetase and tRNATrp? Does the enzyme primarily recognize the anticodon or not?arrow_forwardWhich of the following are stages of translation? Select all that apply. a.As the ribosome moves from codon to codon, amino acids brought by successive tRNAs to the ribosome form a growing polypeptide. b.A tRNA binds to the second codon and its carried amino acid forms a peptide bond with methionine. c.When the ribosome reaches a stop codon, its subunits detach, and the mRNA and new polypeptide are released. d.Ribosomal subunits and a tRNA carrying methionine converge on the start codon of an mRNA. e.The binding of a tRNA to the third codon causes the ribosome to release the first tRNA and move to the next codon.arrow_forwardThe covalent attachment of an amino acid to a tRNA is an endergonic reaction. In other words, it requires an input of energy for the reaction to proceed. Where does the energy come from to attach amino acids to tRNA molecules?arrow_forward
- Examine the following base sequence – 5’ UGA 3’. It represents the anticodon region of a particular tRNA. Based on this knowledge you know that a. This tRNA would be used to stop translation. b. This tRNA would carry the amino acid Serine to the ribosome. c. This tRNA would carry the amino acid Threonine to the ribosome. d. This tRNA would bind a TCA codon on DNA. e. This tRNA would not carry any amino acid to the ribosome. f. This tRNA would carry the amino acid Leucine to the ribosome.arrow_forwardWhich of the following cannot be said regarding aminoacyl tRNA synthetase? It is essential for the correct reading of codons. A single tRNA synthetase can attach different amino acids to their corresponding tRNA. It is first activated when it catalyzes a reaction between ATP and an amino acid to form an aminoacyladenylic acid (amino acyl-AMP). It is responsible for the attachment of the correct amino acid to the correct tRNA. There is a different tRNA synthetase for each amino acid that will be attached to a tRNA.arrow_forwardWhich of the following is NOT a general feature of tRNA? A. All TRNAS contain 4 loops, the anticodon loop, the hydroxy-uridine and methylcytosine loops and a variable loop B. The tertiary structure of tRNAs is L-shaped C. All ERNAS contain anti-codons D. All TRNAS contain amino acids attached to the 3'-OH end E. All ERNAS contain the rare nucleotides, hydroxyuridine and methyl cytosinearrow_forward
- You are studying a eukaryotic gene in which translation normally begins at the second AUG in the mRNA (underlined). The sequence surrounding both AUGs is CGGAUGCACAGGACAUCCUACCUACGGAGAUGA.... Predict the effects of the following mutations on the translation of this mRNA. Present the new sequence, highlight the changes in the sequence and consider the best context for translation. a. Change the first and second C to G b. Change the first and second C to G and also change the UAC codon before the second AUG to UAG.arrow_forwardWhich of the following statements regarding O-linked glycosylation is FALSE? A. It occurs on asparagines (Asn) in specific proteins. B. It is an important post-translational protein modification. C. It is built sequentially on proteins by individual enzymes that are found in each cisterna of the Golgi (i.e. cis, medial, trans). D. It occurs in the Golgi. It occurs on serine (Ser) and threonine (Thr) residues in specific proteins.arrow_forwardThe tertiary structure of a tRNA is shown below. Using the various colored areas (i.e., red, yellow, green, blue) as a marker, identify the region where the anticodon is found and identify the amino acid binding site. Explain the importance of the tRNA as an adaptor during protein synthesis.arrow_forward
- What enzyme catalyzes protein synthesis in bacteria? You discover a new broad-spectrum antibiotic that inhibits protein synthesis and named it Compound J. You want to determine the mechanism of action of Compound J. After treating bacteria cells with Compound J, you observe many ribosomes with long polypeptide chains bound to them. Based on this observation, make a hypothesis about which part of the ribosome Compound J is binding and how this specifically affects translation. What evidence supports that proper protein folding is essential to all domains of life? Name and describe the function/s of two specific molecules that help proteins fold in bacteria.arrow_forwardSuppose the following peptide chain was attached to a gly -tRNA during translation : met -leu-asp -glu-asn -cys gly - tRNA a. If the next incoming tRNA carries serine , where will serine be added to the growing polypeptide chain ? Write the new peptide chain. Label both ends of the peptide . b. Where in the ribosome are the peptide chains located ? 1. New chain 2. Old chainarrow_forwardWhat would be the direct consequence to a cell of loss-of-function of Elongation Factor-Tu (EF-Tu)? You may select multiple answers. a. tRNAs would fail to exit the E site after giving up their amino acid. b. The error rate of translation would increase. c. The ribosome would frequently fail to identify the correct start codon and initiation of translation would become less efficient. d. There would be no pause between the entry of a tRNA into the A site and peptidyl transfer.arrow_forward
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