If a gene encoding a protein whose third amino acid is tyrosine is affected by a single nucleotide substitution in that tyrosine codon, how many of the other 19 amino acids could possibly end up replacing tyrosine as the third amino acid?

6 different amino acids (no including Stop codons)

Explanation:

First of all, it is necessary to know that tyrosine is an amino acid coded by two different codons: UAU and UAC.

If there's a single nucleotide substitution, we need to redefine the new possible codons:

For UAU:

- Substitution in the first nucleotide:

* CAU: His

* GAU: Asp

* AAU: Asn

- Substitution in the second nucleotide:

* UCU: Ser

* UGU: Cys

* UUU: Phe

- Substitution in the third nucleotide:

* UAG: Stop

* UAC: Tyr

* UAA: Stop

For UAC:

- Substitution in the first nucleotide:

* CAC: His

* GAC: Asp

* AAC: Asn

- Substitution in the second nucleotide:

* UUC: Phe

* UGC: Cys

* UCC: Ser

- Substitution in the third nucleotide:

* UAG: Stop

* UAA: Stop

* UAC: Tyr

Possible amino acids replacing tyrosine (His, Asp, Asn, Phe, Cys, Ser)

the mass of the cathode increases because ions from the solution get reduced to atoms and become part of the cathode.

explanation:

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