Biology Multiple Choice Questions on “Biomolecules – Structure of Proteins-1”.
1. Proteins are heteropolymers of ______
a) lipids
b) monosaccharides
c) peptides
d) amino acids
Answer: d
Clarification: Proteins are heteropolymers made of amino acid monomers. There are 21 amino acids. Various numbers and combinations of amino acids in a sequence or chain forms different types of proteins.
2. Structure of molecules in inorganic chemistry refers to the ______
a) three-dimensional structure
b) two-dimensional structure
c) molecular formula
d) primary structure
Answer: c
Clarification: Structure of molecules in inorganic chemistry refers to the molecular formula of the compound. In organic chemistry it refers to the two-dimensional structure while in physics it refers to the three-dimensional structure.
3. Structure of molecules in physics refers to the ______
a) primary structure
b) two-dimensional structure
c) three-dimensional structure
d) molecular formula
Answer: c
Clarification: In physics, the structure of molecules refers to the three-dimensional structure of the molecule. In inorganic chemistry it refers to the molecular formula of the compound. In organic chemistry it refers to the two-dimensional structure.
4. How many levels of organization do proteins have?
a) 4
b) 3
c) 2
d) 5
Answer: a
Clarification: There are four levels of structural organization of proteins. These are the primary structure, secondary structure, tertiary structure and the quaternary structure. The level affects the function of the protein.
5. What is the configuration of proteins in the primary structure?
a) Helix
b) Line
c) Sheet
d) Globule
Answer: b
Clarification: In the primary structure of proteins, the proteins are imagined to be arranged in a linear fashion such as a line. Helix and sheets are the configuration of proteins for the secondary structure.
6. What makes up the primary structure of proteins?
a) Peptides
b) Peptones
c) Amino acids
d) Polypeptides
Answer: c
Clarification: The primary structure of amino acids is made of monomers of amino acids. The amino acids are linked together by peptide bonds between the amino group of one amino acid and the carboxyl group of the adjacent one.
7. What is the left end of the primary structure of proteins represented by?
a) First amino acid
b) Last amino acid
c) Cofactor
d) Methyl group
Answer: a
Clarification: The primary structure of amino acids is made of monomers of amino acids. Hence, cofactors are absent. The left end of the primary or linear structure of proteins is represented by the first amino acid.
8. What is the right end of the primary structure of proteins represented by?
a) Methyl group
b) Cofactor
c) First amino acid
d) Last amino acid
Answer: d
Clarification: The primary structure of amino acids is made of monomers of amino acids. Hence, cofactors are absent. The right end of the primary or linear structure of proteins is represented by the last amino acid.
9. What is the first amino acid of the primary structure known as?
a) A-terminal amino acid
b) C-terminal amino acid
c) N-terminal amino acid
d) L-terminal amino acid