Protein

Which of the following bond(s) do(es) NOT exist in a secondary structure?

• Peptide bond

• Hydrogen bond

• Disulphide bond

• Ionic bond

The difference between tertiary and quartenary structure is:

• Tertiary structure has double bond whereas quartenary structure does not have double bond

• Tertiary structure consists of one polypeptide chain whereas quartenary structure consists of more than one polypeptide chains

• Tertiary structure is fibrous whereas quartenary structure is globular

• Tertiary structure is water-soluble whereas quartenary structure is lipid soluble

The repeating units of protein are

• Amino acids

• Glucose

• Fatty acid

• Peptides

Tags

NGSS.HS-LS1-6

The polypeptide in the diagram consists of;

• 3 amino acids and 3 peptide bonds

• 3 amino acids and 2 peptide bonds

• 4 amino acids and 2 phosphodiester bonds

• 3 amino acids and 2 phosphodiester bonds

The diagram shows the structure of collagen. Based on the diagram, what is the structural level of collagen?

• Primary

• Secondary

• Tertiary

• Quartenary

During the formation of the peptide bond which of the following takes place?

• Hydroxyl group is lost from its carboxyl group of one amino acid and a hydrogen atom is lost from its amino group of another amino acid

• Hydrogen atom is lost from its carboxyl group of one amino acid and a hydroxyl group is lost from its amino group of another amino acid

• Hydroxyl group is lost from its carboxyl group of one amino acid and a hydroxyl group is lost from its amino group of another amino acid

• Hydrogen atom is lost from its carboxyl group of one amino acid and a hydrogen atom is lost from its amino group of another amino acid

Tertiary structure is formed due to

• interaction between the functional groups of different amino acids within a polypeptide chain

• interaction between the side chain of different amino acids within a polypeptide chain

• interaction between the functional groups of different amino acids between two polypeptide chains

• interaction between the side chain of different amino acids between two polypeptide chains

Which of the following bond(s) can be found in a tertiary structure?

• hydrogen bond

• disulphide bridge

• hydrophobic interaction

• all of the above

Haemoglobin is a quartenary protein because;

• It has more than one peptide bonds

• Its shape is globular

• It consists of more than one polypeptide chains

• It has iron in each heme group

Based on the diagram, the side chain of amino acid alanine is;

• NH₂

• COOH

• H

• CH₃