Which conjugated protein is synthesized by copper?

Which of the following statements are correct regarding amino acids?
$A$. They are substituted methanes.
$B$. Serine is an aromatic amino acid.
$C$. Valine is a neutral amino acid.
$D$. Lysine is an acidic amino acid.
Choose the correct answer from the options given below:

Glycoproteins contain

$A$: The properties and types of amino acids vary.
$R$: The chemical structure of amino acids differs due to the $R$ group.

What is correct for glutamic acid?
$I$. Acidic
$II$. Basic
$III$. Neutral
$IV$. Contain $C$ and $N$.

How many types of amino acids are there in living organisms?