Biology: Life on Earth (11th Edition)
11th Edition
ISBN: 9780134168296
Author: Gerald Audesirk, Teresa Audesirk, Bruce E. Byers
Publisher: PEARSON
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Textbook Question
Chapter 13, Problem 3RQ
Define the following terms: genetic code, codon, and anticodon. What is the relationship among the bases in DNA, the codons of mRNA, and the anticodons of tRNA?
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Define the following terms: genetic code, codon, and anticodon. What is the relationship among the bases in DNA, the codons of mRNA, and the anticodons of tRNA?
which statement about genetic code is not true?
A) mRNA is read 3 bases at a time, which are called codons. B) There is one initiator codon that codes for an amino acid. C) Each amino acid is coded for by only one codon. D) There are 3 termination codons that do not code for amino acids. E) Each codon is specific for only one amino acid.
An anion has an equilibrium potential of -40 mV. What direction are the chemical and electrical forces acting on the anion at the resting membrane potential (-70 mV)?
A) Both the chemical and electrical forces are directed out of the cell. B) The chemical force is directed out of the cell and the electrical force is directed into the cell. C) The chemical force is directed into the cell and the electrical force is directed out of the cell. D) There is insufficient information to answer this question. E) Both the chemical and electrical forces are directed into the cell.
Why may tRNA be considered the “interpreter” of the genetic code?
Chapter 13 Solutions
Biology: Life on Earth (11th Edition)
Ch. 13 - 1. The molecule that carries the genetic...Ch. 13 - 2. Which of the following is not true of...Ch. 13 - 3. A stop codon
a. signals the end of protein...Ch. 13 - Prob. 4MCCh. 13 - Epigenetic modification of gene expression a....Ch. 13 - Prob. 1FTBCh. 13 - The three types of RNA that are essential for...Ch. 13 - 3. The genetic code uses______ (how many?) bases...Ch. 13 - The enzyme_______ synthesizes RNA from the...Ch. 13 - Prob. 5FTB
Ch. 13 - Prob. 6FTBCh. 13 - How does RNA differ from DNA?Ch. 13 - Prob. 2RQCh. 13 - Define the following terms: genetic code, codon,...Ch. 13 - 4. How is mRNA formed from a eukaryotic gene?
Ch. 13 - 5. Diagram and describe protein synthesis.
Ch. 13 - 6. Explain how complementary base pairing is...Ch. 13 - 7. Describe the principal mechanisms of regulating...Ch. 13 - Define mutation. Describe four different effects...Ch. 13 - Many years ago, some researchers reported that...Ch. 13 - Prob. 2AC
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- Which of the following is an example of the degeneracy of the genetic code?Group of answer choices a) each codon specifies more than one amino acid b) the genetic code is not degenerate c) an amino acid can have more than one codon d) None of the abovearrow_forwardHow many codons are needed to specify one amino acid?arrow_forwardIf DNA codes for mRNA and mRNA codes for protein, then how can the same DNA sequence generate different proteins? What are the 3 tRNA sites on the small ribosomal subunit (just abbreviations)? What is the order of tRNA entrance and exit through the ribosome?arrow_forward
- In how many cases in the genetic code would it NOT be possible to know the amino acid specified by a codon if only the first two nucleotides of the codon are known?arrow_forwardDescribe the specificity between the amino acid carried by a tRNA and a codon in mRNA.arrow_forwardMention any four important characteristics of genetic code.arrow_forward
- Amino acids are translated from mRNA codons and each codon is made up of three nucleotide bases. How might an extra single base INSERTION into the second codon of a coding sequence of a gene affect the amino acid sequence of the protein encoded by the gene? (Hint: You may want to write out a made-up example of an insertion like the one described above) The entire amino acid sequence would shift and be changed. O A single amino acid would change only. O The mutation may have no effect on the amino acid sequence. O A single extra amino acid would be present in the protein. O All of the above are possible outcomes.arrow_forwardWhich of the following best describes a stop codon? A) They are codons that indicate termination of protein synthesis. B) They are codons that are extra in the genetic code and are not used. C) They are codons that indicate when to create new peptide bonds. D) They are codons that signal when the RNA strand is done being read. E) They are codons that indicate when to begin folding the polypeptide.arrow_forwardA gene contains 141 codons. How many nucleotides are present in the gene’s coding sequence? How many amino acids are expected to be present in the polypeptide encoded by this gene?arrow_forward
- Explain the steps of RNA translation into protein. Mutations: The codon GGA encodes the amino acid glycine. Identify the type of mutation for each of the following changes (name both the type of mutation and what the new codon would produce): GGA to GGG GGA to UGA GGA to GAGA GGA to AGAarrow_forwardA DNA strand consists of any sequence of four kinds of nucleotides. Suppose there were only 14 different amino acids instead of 20. Which of the following statements would be correct descriptions of the minimal number of nucleotides necessary to create a genetic code? a) 1 b)2, provided that chain termination does not require a special codon c) 3, provided that chain termination does require a special codon d)2, no matter how chain termination is accomplished e) Both b and carrow_forwardThe nearly universal genetic code consists of how many codons?arrow_forward
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