Which of the following amino acids contains a non-polar '$R$' group?

$A$: Tertiary structure of protein molecules makes them biologically active.
$R$: It is the native configuration of protein molecules maintained by multiple covalent bonds only.

Alanine and Phenylalanine are which type of amino acids?

In protein synthesis,the first amino acid is known as $.....P.....$ and the last amino acid is known as $.....Q.....$.

What type of amino acids are phenylalanine and tyrosine,respectively?

Statement $P$: The quaternary structure of proteins is either globular or fibrous.
Statement $Q$: The three-dimensional arrangement of molecules consisting of a single polypeptide chain is the quaternary structure of proteins.