Answer and explanation;
-Aba is a suitable replacement because Aba and Cys have approximately the same sized side chain and are similarly hydrophobic.
-However, Aba cannot form disulfide bonds so it will not be a suitable replacement if these are required.
-Alpha-Aminobutyric acid is biosynthesized by transaminating oxobutyrate, a metabolite in isoleucine biosynthesis.
The answer is
c. he should write down data clear, step-by-step instructions as he goes along
It can be turned into chemical energy as food and then to mechanical energy by the thing receiving the chemical energy.