Which of the following would explain the formation of double-stranded loops in tRNA? A. complementary base pairing B. steric interactions between the aromatic rings of the purine bases C. electronic interactions between the negatively-charged phosphate groups D. change in the conformation of the rings of the sugars

Which of the following would explain the formation of double-stranded loops in tRNA? A. complementary base pairing B. steric interactions between the aromatic rings of the purine bases C. electronic interactions between the negatively-charged phosphate groups D. change in the conformation of the rings of the sugars

Biology Today and Tomorrow without Physiology (MindTap Course List)

5th Edition

ISBN:9781305117396

Author:Cecie Starr, Christine Evers, Lisa Starr

Publisher:Cecie Starr, Christine Evers, Lisa Starr

Chapter7: Gene Expression And Control

Section: Chapter Questions

Problem 1CT

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Which of the following is true about tRNA? Select one: A. All tRNAs have a CCA sequence at the 3'-end. B. All tRNAs have a CCG sequence at the 5'-end. C. All tRNAs have a CAC sequence at the 3'-end. D. All tRNAs have a CCA sequence at the 5'-end. E. All tRNAs have a CCG sequence at the 3'-end.
Which of the following regions on the tRNA are composed of a sequence of nucleotides? a. anticodon that binds to codon in mRNA b. anticodon that binds to codon in ribosomes c. anticodon that binds to codon in tRNA synthetase d. none of the above
amino acids are covalently linked to tRNAs via what a) phosphodiester bond b) premature termination of translation c) anticodon-codon base pairing d) aminoacyl bond e) N-glycosidic bond
For each amino acid added to a polypeptide which of the following must happen? a a charged tRNA must bind at the A site of a ribosome b a peptide bond must be made c the mRNA must move down three bases d all of the above
Which of the following statements is/are TRUE about wobble base pairing? a. Explains why there are 64 codons but less than 64 tRNAs. b. Codons for an amino acid differ in their 1st base. c. Several tRNAs can bind to more than one anticodon. d. Can minimize damage caused by misreading of the code.
In which of the ribosomal sites, the A site, P site, and/or E site, could the following be found? A. A tRNA without an amino acid attached B. A tRNA with a polypeptide attached C. A tRNA with a single amino acid attached
Which of the following best describes tRNA? a. Provides the instructions for the amino acid sequence of a polypeptide b. Complexes with ribosomal proteins to form ribosomes c. Used for eukaryotic RNA processing d. Transports amino acids to ribosomes during translation
Which part of a tRNA molecule acts as an amino acid attachment site? a. the 5' end b. the 3' end c. the anticodon d. any of these
Which of the following nucleotide triplets best represents a codon? A. A triplet in the middle of a ribosomal RNA molecule B. A triplet separated spatially from other triplets C. A triplet in the same reading frame as an upstream AUG D. A triplet at the opposite end of tRNA from the attachment site of the amino acid E. A sequence in tRNA at the 3’ end
In the chain elongation of proteins, the new aminoacyl-tRNA bonds to? a.A site b.E site c.G site d.P site
If a tRNA has an anticodon with the sequence 5′-CAG-3′, which amino acid does it carry? a. Aspartic acid c. Leucine b. Valine d. Glutamine
Which of the following describes the interactions between a codon and an anticodon? A. A codon and an anticodon become covalently bonded together due to the activity of the ribosome. B. A codon and anticodon do not come into direct contact because codons are in the nucleus but anticodons are in the cytoplasm. C. A codon and anticodon are attracted to each other due to hydrogen bonding. D. A codon and an anticodon are linked together by an amino acid. ..