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.
Schleiden proposed what would become known as the cell theory in 1838.
Louis Pasteur contributed to the cell theory by disproving spontaneous generation. He was the first scientist to prove that cells can only form from pre-existing cells.
Rudolf Virchows most widely known scientific contribution is that he backed up Schleidens previous discovery in 1838.
Neck- the neck is close to the brain which the body wants to protect at all costs, therefore making this area extremely sensitive. It’s also an area that isn’t used to constant contact, which can dull nerves and grow calloused as feet are