Understanding Amino Acids

What is the zwitterionic form of an amino acid?

• A form with both positive and negative charges

• A form with no charge

• A form with only a negative charge

• A form with only a positive charge

Which of the following properties can amino acid side chains have?

• Only aromatic

• Hydrophobic, hydrophilic, acidic, basic, aromatic, or aliphatic

• Only acidic

• Only hydrophobic

What is the significance of amino acids that are not found in proteins?

• They can act as signaling molecules like neurotransmitters or hormones

• They are only found in plants

• They have no physiological significance

• They are used only in laboratory experiments

What makes an amino acid essential for humans?

• It is not necessary for protein synthesis

• It is only found in plants

• It must be ingested through diet

• It can be synthesized by the body

How many amino acids can humans synthesize on their own?

• All 20 amino acids

• None of the amino acids

• 11 out of 20 amino acids

• 9 out of 20 amino acids