Which of the following is not true? There are two major classes of aminoacyl-tRNA synthetases The selectivity of the aminoacyl-tRNA synthetases for their tRNA molecules is often called the second genetic code A single activating enzyme can interact with all the tRNAs for its corresponding amino acid aminoacyl-tRNA synthetases link amino acids to tRNA molecules without the need for an energy source
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Which of the following is not true?
-
There are two major classes of aminoacyl-tRNA synthetases
-
The selectivity of the aminoacyl-tRNA synthetases for their tRNA molecules is often called the second genetic code
-
A single activating enzyme can interact with all the tRNAs for its corresponding amino acid
-
aminoacyl-tRNA synthetases link amino acids to tRNA molecules without the need for an energy source
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- TRNAS are 'charged' or activated by aminoacyl TRNA synthetases. Select the correct statements regarding this process. The process is dependent on interactions between ribosomes and aminoacyl TRNA synthetases. The aminoacid is added to the D-loop of the tRNA. Aminoacyl TRNA synthetases are pre-associated with tRNAS. The amino acid is attached to the terminal to the 3' hydroxyl of an adenine in the acceptor arm. The process requires an aminoacyl-adenylate intermadiate. QUESTION 19 Select the correct statements regarding myosin-mediated contraction the sarcomere. O Ca2+ is required for the binding of myosin to f-actin. Myosin and f-actin are randomly distributed in the sarcomere. Physical pulling of the actin microfilament requires three distinct conformation changes on myosin that involve ATP binding, ATP hydrolysis and sequential release of inorganic phosphate and ADP. Myosin-mediated contracted is ubiquitous across all cell types. O O O OWhich 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.Which of the following statements about tRNA molecules is TRUE? Multiple Choice TRNA assumes a double helical shape Every base in a tRNA molecule pairs with another base in the same tRNA strand, leading to its higher levels of structure Bases in the tRNA loops do not pair with any other bases The amino acid is attached to the central loop region of the tRNA molecule All of the answers are correct.
- Which of the following statements is false about the structure of TRNA? O Because of hydrogen bonds, a tRNA actually twists and folds into a three- dimensional structure. O There are 4 base-paired regions and 3 loops in a tRNA molecule. O Flattened into one plane to reveal its base pairing, a tRNA molecule looks like a cloverleaf. O A TRNA molecule consists of a single RNA strand that is only about 80 nucleotides long. O A TRNA molecule carries an amino acid on its 5' end.The synthesis of a protein requires that the amino acids that constitute the growing polypeptide chain be covalently linked to the amino acid attached to the tRNA at the aminoacyl site of the ribosome. Which of the following catalyses this reaction? Options: the aminoacyl tRNA synthetase eEF2 eEF1-GTP a large ribosomal RNA the initiator tRNA metThe charging of a tRNA with an amino acid can be represented by the following equation:amino acid + tRNA + ATP → aminoacyl-tRNA + AMP + PPI where PPI is pyrophosphate (see figure 3–40). in the aminoacyl-tRNA, the amino acid and tRNA are linked with a high-energy covalent bond; a large portion of the energy derived from the hydrolysis of ATP is thus stored in this bond and is available to drive peptide bond formation at the later stages of protein synthesis. the free-energy change of the charging reaction shown in the equation is close to zero and therefore would not be expected to favor attachment of the amino acid to tRNA. Can you suggest a further step that could drive the reaction to completion?
- A peptidyl-tRNA in the P site has a strange modification with an ether versus an ester bond to the tRNA. When it is in the P site undergoing catalysis in the otherwise normal way, this molecule will become: More susceptible to the nucleophilic attack A better nucleophile O Less susceptible to the nucleophilic attack A worse nucleophileThe 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?Which of the following is true regarding the tRNA structure? The anticodon is found at the 5′ end of the tRNA molecule. An amino acid binds to the 3' end of the tRNA molecule. An amino acid binds to the anticodon of the tRNA molecule. The nucleotides found in a tRNA molecule can only be adenine, uracil, guanine, and cytosine. One region of the tRNA contains a codon and another region of the tRNA contains an anticodon.
- What is the role of aminoacyl-tRNA synthetase? The ability of aminoacyl-tRNA synthetases to recognize tRNAs has sometimes been called the “second genetic code.” Why has the function of this type of enzyme been described this way?Which of the following is true about amino acyl tRNA synthetase? O It binds both an ATP molecule and an amino acid within its active site. Each amino acyl tRNA synthetase is specific for a given a amino acid. O It links AMP to the COOH end of an amino acid. It links an amino acid to the 3' end of the correct tRNA molecule. O All of the above are true.Group of nucleotides that confers specificity for the appropriate aminoacyl-tRNA synthetase is called an: Group of answer choices 3'CCA Tail Lateral Element Identity Element Acceptor Stem