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3. Most synonymous codons exhibit nucleotide differences in their 3rd position. Are there any aa whose...

3. Most synonymous codons exhibit nucleotide differences in their 3rd position. Are there any aa whose synonymous codons that show differences in the 1st position? How many? What are their names?

4. Are there any amino acids whose synonymous codons exhibit nucleotide differences in the 2nd position? How many? What are their names?

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Homework Answers

Answer #1

First, let's list out all the amino acids and their corresponding codons:
Isoleucine ATT, ATC, ATA
Leucine CTT, CTC, CTA, CTG, TTA, TTG
Valine GTT, GTC, GTA, GTG
Phenylalanine TTT, TTC
Methionine ATG
Cysteine TGT, TGC
Alanine GCT, GCC, GCA, GCG
Glycine GGT, GGC, GGA, GGG
Proline CCT, CCC, CCA, CCG
Threonine ACT, ACC, ACA, ACG
Serine TCT, TCC, TCA, TCG, AGT, AGC
Tyrosine TAT, TAC
Tryptophan TGG
Glutamine CAA, CAG
Asparagine AAT, AAC
Histidine CAT, CAC
Glutamic acid GAA, GAG
Aspartic acid GAT, GAC
Lysine AAA, AAG
Arginine CGT, CGC, CGA, CGG, AGA, AGG
Stop codons TAA, TAG, TGA

Answer 3.
Leucine CTT, CTC, CTA, CTG, TTA, TTG
Arginine CGT, CGC, CGA, CGG, AGA, AGG

Answer 4.
There are no such aminos acids.

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