Amino acids

In the isoelectric state of α-amino acids...

• The amino acid has a net charge of zero.
• The amino acid is in a basic state.
• The amino acid has a net charge of +1.
• The amino acid has a net charge of -1.

The amphotericity of amino acids is conditioned...

• the ability to form salts when interacting with acids and alkalis

• formation of salts when interacting with alkalis

•  formation of salts when interacting with acids

• the ability to form intra-complex compounds

What product is formed as a result of decarboxylation of the amino acid glycine: 

• methanamine

• propanamine-1

• 2-aminoethanol

•  propanol

What is the primary function of the amino acid lysine in the human body?

• Energy production

• Collagen synthesis

• Neurotransmitter regulation

• Cell membrane structure

Which of the following amino acids is considered essential for humans?

• Alanine

• Glutamine

• Valine

• Aspartic acid

What is the structural difference between an essential and non-essential amino acid?

• Essential amino acids have a hydrophobic side chain.

• Non-essential amino acids have a carboxyl group.

• Essential amino acids cannot be synthesized by the body.

• Non-essential amino acids are only found in animal proteins.

The amino acids that make up proteins are only... 

• α-amino acids

• compounds of the d-stereochemical series

• essential amino acids

• γ-amino acids 

What product is formed as a result of reductive amination of 2-oxo-3-methylbutanoic acid: 

• alanine

• valine

• isoleucine

• LYSINE

Which of the following reagents can be used for qualitative determination of the amino acid cysteine:

• lead acetate

• Feling's reagent

• ninhydrine reagent

• nitric acid

The isoelectric point of the amino acid lysine is located in the medium whose reaction..

• alkaline

• neutral

• strong acid

• weak acid