Question : 11.What meant by the “tertiary structure” of a protein? A) It : 1318494

11.What is meant by the “tertiary structure” of a protein?

A) It refers to the peptide bonds that join the amino acids together in the protein chain. B) It describes the unique sequence of amino acids in the protein chain.

C) It describes the regular, repeating structures found in the protein chain.

D) It describes the overall three dimensional shape of a protein.

E) It describes the association of two or more polypeptide chains to form one functioning protein unit.

12.Hemoglobin and glycoproteins are two examples of proteins that contain a prosthetic group.  What is a prosthetic group?

A) a nonprotein group bonded to a protein to create a functional unit

B) an inhibitor of the function of the protein

C) an enzyme that allows the protein to function more efficiently

D) a side chain amino acid that is not one of the 20 standard amino acids

E) an artificial amino acid that has been synthesized in the laboratory

13.The properties of amino acids and the proteins they compose are based on the nature of their side chain group.  Which term best classifies the side chain of the amino acid phenylalanine?

A) basic

B) acidic

C) nonpolar, hydrophobic

D) polar, neutral

E) polar, hydrophilic

14.Tuftsin is a tetrapeptide that stimulates and promotes the destruction of tumor cells.  What is meant by the term tetrapeptide?

A) There are four separate peptide chains in its structure.

B) Four peptide bonds join the amino acid together in its structure.

C) Four amino acids are present joined together by peptide bonds.

D) Four different secondary structures are present.

E) This protein has a quaternary level of structure.

15.What is meant by the “quaternary structure” of a protein?

A) It refers to the four atoms that make up the peptide bonds that join the amino acids together in the protein chain.

B) It describes the unique sequence of four amino acids in the protein chain.

C) It describes the four regular, repeating structures found in the protein chain.

D) It describes the overall three dimensional shape of a protein.

E) It describes the association of two or more polypeptide chains to form one functioning protein unit.

16.Consider the following forms of the amino acid alanine (Ala). Which statement concerning these structures is FALSE?

A) Structure I represents the form of Ala present in the blood at physiological pH.

B) Structure II represents the form of Ala present in the basic environment of the intestines.

C) Structure III represents the form of Ala present in the acidic environment of the stomach.

D) Structure IV represents the zwitterion of Ala.

E) None of the above statements are false.

17.Which of the following statements concerning sickle cell anemia is FALSE?

A) Individuals with sickle cell anemia produce a mutant hemoglobin called sickle cell hemoglobin, so called due to the sickled appearance of the red blood cells that form in this condition.

B) Sickle cell hemoglobin differs from normal hemoglobin by only one amino acid residue.

C) Individuals who suffer from sickle cell anemia inherited two genes for sickle cell hemoglobin, one from each parent.

D) Individuals with sickle cell trait have inherited only one copy of the gene for sickle cell hemoglobin and one for normal hemoglobin.

E) The presence of sickle cell trait is related to an increase in resistance to diabetes.

18.What is the term for the state of a protein when its organized structure has become completely disorganized?

A) hydrolyzed

B) isomerized

C) globular

D) denatured

E) fibrous

19.What protein is the oxygen storage protein of the skeletal muscles?

A) insulin

B) collagen

C) myoglobin

D) albumin

E) hemoglobin

20.Which of the following is a structural protein?

A) albumin

B) keratin

C) insulin

D) trypsin

E) myoglobin