An essential amino acid, or indispensable amino acid, is an amino acid that cannot be synthesized de novo by the organism, and thus must be supplied in its diet therefore making this statement true.
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The building blocks of proteins. Each contains an amino group, an acid group, and a unique side chain
c) always accurate
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answer: c. the experiment shows that the red substance experienced a chemical change.
explanation: chemical change is the change in which chemical composition of the substance changes. physical change is the change in which there is no change in chemical composition.
chemical changes are accompanied by following changes:
a) precipitate formation
b) energy is released or absorbed
c) formation of bubbles
d) change in color
as it is given that the red color has disappeared and there is production of gas, it means the red substance has undergone a chemical change.