Biology
Biology
12th Edition
ISBN: 9781260494570
Author: Raven, Peter
Publisher: MCGRAW-HILL HIGHER EDUCATION
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Chapter 18, Problem 4U

An open reading frame (ORF) is distinguished by the presence of

a. a stop codon.

b. a start codon.

c. a sequence of DNA long enough to encode a protein.

d. All of the choices are correct.

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There are 61 mRNA codons that specify an amino acid, but only 45 tRNAs.  This is best explained by the fact that      A. some tRNAs have anticodons that recognize two or more different codons.     B. the rules for base pairing between the third base of a codon and tRNA are flexible.     C. many codons are never used, so the tRNAs that recognize them are dispensable.     D. A and B only     E. A, B, and C
A codon is: a. An alternative name for gene b. Three amino acids that encode a nucleotide c. Three nucleotides that encode an amino acid d. One of three nucleotides that encode and amino acid
Which of the following statements are accurate descriptions of the genetic code? MARK ALL THAT APPLY Select one or more: a. The genetic code is made up of triplet nucleotides that specify an amino acid. b. The genetic code is unambiguous because codons only specific a single amino acid. C. The genetic code is read in an overlapping manner. d. The genetic code is redundant because a single codon can specify more than one amino acid. e. Some amino acids are encoded by more than one codon. f. All codons of the genetic code specify amino acids.
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