BIOCHEM EXAM 2 NEW EDITION 2025/2026 QUESTIONS
WITH 100% ACCURATE ANSWERS
The water content in the human body is approximately:
A) 90%.
B) 80%.
C) 70%.
D) 60%.
E) 50%. - C) 70%
The four most abundant chemical elements in living systems are:
A) hydrogen, oxygen, sulphur and phosphorus.
B) hydrogen, carbon, nitrogen and oxygen.
C) sodium, potassium, carbon and oxygen.
D) sodium, potassium, nitrogen and sulphur.
E) carbon, nitrogen, oxygen and potassium. - B) Hydrogen, carbon, nitrogen, and oxygen
Nearly all proteins contain:
A) cobalt.
B) phosphorus.
C) selenium.
D) sulphur.
E) none of the above. - D) sulphur.
Which of the following statements is FALSE?
A) Proteins can be structural components of cells.
B) Proteins can transmit signals between cells.
C) Proteins can transport molecules within cells and between cells.
D) Proteins can be both hormones and hormone receptors.
E) Proteins are the only biological polymer that can catalyse biochemical reactions. - E) Proteins are
the only biological polymer that can catalyse biochemical reactions.
,Which of the following is NOT classed as a lipid?
A) Cholesterol
B) Palmitic acid
C) Glycerol
D) Phosphatidyl serine
E) Triacylglycerol - C) Glycerol
Amino acids and simple organic compounds like carbon dioxide and hydrogen cyanide cannot be
produced without the use of enzymes. - False
Oxidation-reduction reactions, which are the basis of many biochemical reactions and pathways,
cannot take place in the absence of oxygen. - False
Many biochemical reactions that form biopolymers from monomeric units involve the removal of
water. - True
The principal component of a biological membrane is a triglyceride. - False
The chemical element ________ has a role in both transfer of energy as well as in the structure of
nucleic acids. - Phosphorous
List the four major classes of biological macromolecules. - lipids, carbohydrates, proteins, nucleic
acids
An amphipathic molecule provides the foundation for biological membranes because they have both
________ and ________ functional groups. - hydrophilic, hydrophobic
Genomics is concerned with the entire ________, while ________ is focused on identifying all of the
proteins of a cell. - genome, proteomics
Each of the following is a noncovalent interaction EXCEPT:
A) a hydrogen bond.
B) a carbon-hydrogen bond.
, C) the interaction between an amino and a carboxylate group.
D) a van der Waals interaction.
E) an interaction between —NH3+ and a water molecule. - B) a carbon-hydrogen bond.
The most important noncovalent interaction in biochemistry is the ________ bond. - hydrogen
Which of the following is FALSE when considering van der Waals interactions?
A) The van der Waals radius represents the most stable distance between two interacting centres.
B) Van der Waals radii can determine molecular surfaces.
C) Molecules that interact by van der Waals forces do not interpenetrate.
D) The total interaction energy is the sum of the attractive and repulsive forces.
E) They are not important in determining the stability of three-dimensional structures of proteins - E)
They are not important in determining the stability of three-dimensional structures of proteins
Which of the following in biological compounds are sufficiently electronegative to serve as strong
donors in a hydrogen bond?
A) Hydrogen and oxygen
B) Oxygen and nitrogen
C) Nitrogen and hydrogen
D) Hydrogen and carbon
E) Nitrogen and carbon - B) Oxygen and nitrogen
Hydrogen bonds share features of both covalent and noncovalent bonds. - True
Which of the following is TRUE of hydrophobic molecules?
A) They have limited solubility in water.
B) Water forms a cage-like structure around them.
C) Dissolving in water decreases the entropy of the mixture.
D) They self-associate by releasing some of the surrounding water molecules.
E) All of the above - E) All of the above
Water is both a hydrogen bond donor and acceptor - True
WITH 100% ACCURATE ANSWERS
The water content in the human body is approximately:
A) 90%.
B) 80%.
C) 70%.
D) 60%.
E) 50%. - C) 70%
The four most abundant chemical elements in living systems are:
A) hydrogen, oxygen, sulphur and phosphorus.
B) hydrogen, carbon, nitrogen and oxygen.
C) sodium, potassium, carbon and oxygen.
D) sodium, potassium, nitrogen and sulphur.
E) carbon, nitrogen, oxygen and potassium. - B) Hydrogen, carbon, nitrogen, and oxygen
Nearly all proteins contain:
A) cobalt.
B) phosphorus.
C) selenium.
D) sulphur.
E) none of the above. - D) sulphur.
Which of the following statements is FALSE?
A) Proteins can be structural components of cells.
B) Proteins can transmit signals between cells.
C) Proteins can transport molecules within cells and between cells.
D) Proteins can be both hormones and hormone receptors.
E) Proteins are the only biological polymer that can catalyse biochemical reactions. - E) Proteins are
the only biological polymer that can catalyse biochemical reactions.
,Which of the following is NOT classed as a lipid?
A) Cholesterol
B) Palmitic acid
C) Glycerol
D) Phosphatidyl serine
E) Triacylglycerol - C) Glycerol
Amino acids and simple organic compounds like carbon dioxide and hydrogen cyanide cannot be
produced without the use of enzymes. - False
Oxidation-reduction reactions, which are the basis of many biochemical reactions and pathways,
cannot take place in the absence of oxygen. - False
Many biochemical reactions that form biopolymers from monomeric units involve the removal of
water. - True
The principal component of a biological membrane is a triglyceride. - False
The chemical element ________ has a role in both transfer of energy as well as in the structure of
nucleic acids. - Phosphorous
List the four major classes of biological macromolecules. - lipids, carbohydrates, proteins, nucleic
acids
An amphipathic molecule provides the foundation for biological membranes because they have both
________ and ________ functional groups. - hydrophilic, hydrophobic
Genomics is concerned with the entire ________, while ________ is focused on identifying all of the
proteins of a cell. - genome, proteomics
Each of the following is a noncovalent interaction EXCEPT:
A) a hydrogen bond.
B) a carbon-hydrogen bond.
, C) the interaction between an amino and a carboxylate group.
D) a van der Waals interaction.
E) an interaction between —NH3+ and a water molecule. - B) a carbon-hydrogen bond.
The most important noncovalent interaction in biochemistry is the ________ bond. - hydrogen
Which of the following is FALSE when considering van der Waals interactions?
A) The van der Waals radius represents the most stable distance between two interacting centres.
B) Van der Waals radii can determine molecular surfaces.
C) Molecules that interact by van der Waals forces do not interpenetrate.
D) The total interaction energy is the sum of the attractive and repulsive forces.
E) They are not important in determining the stability of three-dimensional structures of proteins - E)
They are not important in determining the stability of three-dimensional structures of proteins
Which of the following in biological compounds are sufficiently electronegative to serve as strong
donors in a hydrogen bond?
A) Hydrogen and oxygen
B) Oxygen and nitrogen
C) Nitrogen and hydrogen
D) Hydrogen and carbon
E) Nitrogen and carbon - B) Oxygen and nitrogen
Hydrogen bonds share features of both covalent and noncovalent bonds. - True
Which of the following is TRUE of hydrophobic molecules?
A) They have limited solubility in water.
B) Water forms a cage-like structure around them.
C) Dissolving in water decreases the entropy of the mixture.
D) They self-associate by releasing some of the surrounding water molecules.
E) All of the above - E) All of the above
Water is both a hydrogen bond donor and acceptor - True
