Biochemistry, sometimes called biological chemistry, is the study of chemical processes within and relating to living organisms. Biochemical processes give rise to the complexity of life.
1.Q: What are the chemical elements that form most of living biological matter?
Ans: The chemical elements that form most of the molecules of living beings are oxygen (O), carbon (C), hydrogen (H) and nitrogen (N).
2.Q: Glucose and fructose are examples of
A. double sugars
C. single sugars
3.Q: What is described as the “building blocks of Protein”?
A. Fiber B. Lipids
C. Amino Acids
4. Q: (CH2O)n is the molecular formula for which type of macromolecules?
D. Nucleic Acid
5.Q: Which macromolecule does not dissolve in water?
D. nucleic acids
6.Q: What type of organic substances are fats?
A. nucleic acid
7.Q: What are the monomers of lipids?
A. Amino acids
B. Simple Sugars
C. Fatty acids and glycerol
D. Nucleic acids
8.Q: Which of the following is a polymer?
A. nucleic acid
B. fatty acid
C. Amino acid
9.Q:Proteins are ____ made of amino acid ____ .
A. monomers; polymers
B. polymers; polypeptides
C. polymers; monomers
D. monomers; molecules
10.Q: Which of the following is NOT a polysaccharide?
11.Q: What are used in animals as a source of quick energy that can be stored in the liver and muscles ？
B. Nucleic acids
12.Q: Fats that have fatty acids with only single covalent bonds in their carbon skeletons are
A. saturated B. unsaturated
C. found in plants instead of animals
D. liquid at room temperature
13.Q: Sugars, starches, and cellulose belong to which major class of biological molecules?
A. Nucleic acids
14.Q: Plants like sugar cane and sugar beets store the energy as simple sugars. Other plants, like corn and potatoes, store the energy as more complex sugars called?
15.Q: This biological macromolecule is responsible for controlling the activity of the cell, and it stores and transports genetic information.
B. Nucleic acid
16.Q: In this type of structure, most of the carbonyl groups of peptide bonds forms a hydrogen bond with the amide nitrogen of another peptide bond four amino acids further down the polypeptide chain:
17.Q: Lipids are used by the body to perform all of the following functions EXCEPT:
A. membrane structural material.
B. enzyme action.
D. a rich energy source.
18.Q: What is the constitutional unit of proteins? • What is the primary structure of a protein? •
Ans: The constitutional units of proteins are the amino acids. • The primary protein structure is the linear sequence of amino acids that form the molecule.
19.Q: What is the secondary structure of a protein? •
Ans: The secondary protein structure is generated by the manner its amino acids interact through the inter-residue bond. These interactions create a spatial conformation of the polypeptide filament. The two most studied secondary conformations of proteins are the alpha-helix and the beta-sheet.
20.Q: The isoelectric point of an amino acid is defined as the pH
A. where the molecule carries no electric charge
B. where the carboxyl group is uncharged
C. where the amino group is uncharged
D. of maximum electrolytic mobility