Amino Acids and Proteins Quiz

What is the basic structure of an amino acid?

• Central carbon atom, amine group, carboxyl group, variable side chain

• Central nitrogen atom, hydroxyl group, carboxyl group, fixed side chain

• Central oxygen atom, amine group, hydroxyl group, variable side chain

• Central carbon atom, hydroxyl group, carboxyl group, fixed side chain

What type of bond connects amino acids to form dipeptides?

• Hydrogen bond

• Ionic bond

• Peptide bond

• Covalent bond

How many essential amino acids are there in humans?

• 5

• 9

• 12

• 20

What is released as a by-product during the formation of dipeptides?

• Oxygen

• Carbon dioxide

• Water

• Nitrogen

What causes proteins to fold differently?

• The number of amino acids

• The sequence of amino acids

• The size of amino acids

• The weight of amino acids

What determines the structure of a protein?

• The order of amino acids in a polypeptide sequence

• The temperature of the environment

• The presence of chaperone proteins

• The pH level of the solution

What can cause the denaturation of a protein?

• Temperature and pH

• Light and sound

• Pressure and humidity

• Salinity and viscosity

What happens to a protein when it is denatured?

• It gains biological activity

• It loses its capacity to function as intended

• It becomes more stable

• It forms new hydrogen bonds

What is the role of hydrogen bonds in protein structure?

• They disrupt the protein folding

• They hold a polypeptide chain together

• They change the charge of a protein

• They increase the temperature of a protein

What are amino acids described as in terms of charge?

• Neutral molecules with both negative and positive regions

• Positively charged molecules only

• Negatively charged molecules only

• Molecules with no charge