Question

. Statements: (1) Collagen, the most abundant protein in humans, is both a fibrous protein and a glycoprotein. (2) Quaternary structure, the highest level of protein organization, is found in all proteins in which 80 or more amino acids are present. (3) A protein chain lacks directionality because its two ends always involve the same amino acid. a. All three statements are true. b. Two of the three statements are true. c. Only one of the statements is true. d. None of the statements are true.

Answer 1

c. Only one of the statements is true-(2) Quaternary structure, the highest level of protein organization, is found in all proteins in which 80 or more amino acids are present.

Explanation: Quantenary structure of a protein is a closely packed or complex organization of proteins together as a result of many polypeptide or subunit of protein joined together. Each subunit has it own primary,secondary and tertiary structure. For protein to function effectively, the subunit must be arranged in an organized or patterned form. It is the highest level of protein organization. Others included primary,secondary and terrier structure.

Example of Quantenary is Heamoglobin that is located in Red blood cell and used for transportation of oxygen and DNA(deoxyribose nucleic acid) Polymerase needing for replication of DNA strand.

Answer 2

c. Only one of the statements is true

Step-by-step explanation:

Quaternary structure, the highest level of protein organization in which association of several protein chains are closely arranged. The protein subunits are attached together by van der Waals forces and hydrogen bonds between nonpolar side chains. it is present in all the proteins which have 80 or more amino acids are present.

Collagen, is most abundant protein in the animal kingdom. It is insoluble fibrous protein present in the extracellular matrix and in connective tissue.

A protein chain has directionality consist of a free amino group at one end, and a free carboxyl group on other end.

Hence, only (2) statement is true the correct option is c.