Ch.17 - Gene ExpressionWorksheetSee all chapters
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Ch.1 - Introduction to Biology
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Ch.3 - Water
Ch.4 - Carbon
Ch.5 - Biological Molecules
Ch.6 - Cells
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Ch.8 - Energy and Metabolism
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Ch.14 - Mendelian Genetics
Ch.15 - Chromosomal Theory of Inheritance
Ch.16 - DNA Synthesis
Ch.17 - Gene Expression
Ch.18 - Regulation of Expression
Ch.19 - Viruses
Ch.20 - Biotechnology
Ch.21 - Genomics
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Ch.55 - Conservation Biology
Sections
Gene Expression and the Genetic Code
Transcription
RNA Processing
Translation
Mutation

Solution: How many different possible 9 bp DNA sequences can code for Arg-Leu-Ser?a. 18b. 32c. 36d. 144e. 216

Problem

How many different possible 9 bp DNA sequences can code for Arg-Leu-Ser?

a. 18

b. 32

c. 36

d. 144

e. 216

Solution

The translation for a tripeptide would require three different codons, many of which are degenerate, meaning more than one codon can code for the same amino acid. But this degeneracy does not extend to the DNA of the organism as there is strict base pairing during the transcription process. Thus, the number of DNA sequences that can code for this particular tripeptide would be equal to the RNA sequences that would give this translation product.

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