Biology 2e
2nd Edition
ISBN: 9781947172517
Author: Matthew Douglas, Jung Choi, Mary Ann Clark
Publisher: OpenStax
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Textbook Question
Chapter 15, Problem 17RQ
In any given species, there are at least how many types of aminoacyl tRNA synthetases?
- 20
- 40
- 100
- 200
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In any given species, there are at least how many types of aminoacyl tRNA synthetases? a. 20 b. 40 c. 100 d. 200
How many different aminoacyl-tRNA synthetases are there in a cell?
64
20
61
45
30
Which 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.
Chapter 15 Solutions
Biology 2e
Ch. 15 - Figure 15.11 A scientist splices a eukaryotic...Ch. 15 - Figure 15.13 Errors in splicing are implicated in...Ch. 15 - Figure 15.16 Many antibiotics inhibit bacterial...Ch. 15 - The AUC and AUA codons in mRNA both specify...Ch. 15 - How many nucleotides are in 12 mRNA codons? 12 24...Ch. 15 - Which event contradicts the central dogma of...Ch. 15 - Which subunit of the E. coli polymerase confers...Ch. 15 - The -10 and -35 regions of prokaryotic promoters...Ch. 15 - Three different bacteria species have the...Ch. 15 - Which feature of promoters can be found in both...
Ch. 15 - What transcripts will be most affected by low...Ch. 15 - How do enhancers and promoters differ? Enhancers...Ch. 15 - Which pre-mRNA processing step is important for...Ch. 15 - What processing step enhances the stability of...Ch. 15 - A scientist identifies a pre-mRNA with the...Ch. 15 - The RNA components of ribosomes are synthesized in...Ch. 15 - In any given species, there are at least how many...Ch. 15 - A scientist introduces a mutation that makes the...Ch. 15 - Imagine if there were 200 commonly occurring amino...Ch. 15 - Discuss how degeneracy of the genetic code makes...Ch. 15 - A scientist sequencing itiRNA identifies the...Ch. 15 - If mRNA is complementary to the DNA template...Ch. 15 - In your own words, describe the difference between...Ch. 15 - A fragment of bacterial DNA reads: 3’...Ch. 15 - A scientist observes that a cell has an RNA...Ch. 15 - Chronic lymphocytic leukemia patients often harbor...Ch. 15 - Transcribe and translate the following DNA...Ch. 15 - Explain how single nucleotide changes can have...Ch. 15 - A normal mRNA that reads 5’ -...
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- Which of the following amino acids is coded for by the above tRNA molecule (in a typical eubacterial cell like E. coli)? methionine N-formylmethionine threonine phenylalanine tyrosinearrow_forwardWhich 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 sourcearrow_forwardThe primary function of a tRNA is to carry amino acids on its ____________ site to a ribosome complex with the help of ____________ Select one: a. 5’ acceptor, endonuclease b. 5’ acceptor, polymerase c. 3’ acceptor, topoisomerase d. 3’ acceptor, amino-acyl synthetasearrow_forward
- 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 sourcearrow_forwardThere are no aminoacyl-tRNAs that will go to the A site of the ribosome when UGA is the codon. Is this true of false?arrow_forwardWhich 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. rRNAarrow_forward
- The 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_forwardIf the anticodon on the tRNA is 3' GCC 5' , the amino acid added by tRNA synthetase will be? 1. P 2. R 3.A 4.Garrow_forwardThe 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 metarrow_forward
- Determine whether this statement is true or false: Aminoacyl-tRNA synthetase covalently links the amino acid to the 5’ end of the correct tRNA molecule.arrow_forwardDescribe the two sequential reactions that occur in the activesite of aminoacyl-tRNA synthetases.arrow_forwardWhich of the following enzymes adds a new amino acid to the growing chain of a protein during protein synthesis? a. aminoacyl-tRNA synthetase b. peptidyl synthetase c. peptidyl transferase d. ribosomal synthetasearrow_forward
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