CHEM 210 Module 1 | Biochemistry Exam Q&A | Portage
Learning
These are original practice questions written for study. They cover common CHEM 210
Module 1 | Biochemistry topics: biomolecules, water, pH/buffers, amino acids,
proteins, enzymes, carbohydrates, lipids, nucleic acids, and clinical applications.
Question 1:
Biochemistry is best defined as the study of:
A. Only inorganic reactions
B. Chemical processes within living organisms
C. Only nuclear reactions
D. Physical properties of metals
Correct answer: B
Rationale: Biochemistry studies the chemical processes and substances in living
organisms.
Question 2:
Which are the four major classes of biomolecules?
A. Carbohydrates, lipids, proteins, nucleic acids
B. Acids, bases, salts, metals
C. Vitamins, minerals, water, oxygen
D. Alkanes, alkenes, alkynes, aromatics
Correct answer: A
Rationale: The four major biomolecule classes are carbohydrates, lipids, proteins, and
nucleic acids.
Question 3:
Which functional group makes a molecule more polar and water-soluble?
A. Methyl
B. Hydroxyl
C. Phenyl
D. Alkyl
Correct answer: B
Rationale: Hydroxyl (—OH) groups increase polarity and hydrogen bonding with water.
,Question 4:
Which bond links amino acids in proteins?
A. Glycosidic bond
B. Peptide bond
C. Phosphodiester bond
D. Ester bond
Correct answer: B
Rationale: Peptide bonds connect amino acids into polypeptides.
Question 5:
Which bond links monosaccharides in carbohydrates?
A. Peptide bond
B. Glycosidic bond
C. Phosphodiester bond
D. Hydrogen bond
Correct answer: B
Rationale: Glycosidic bonds join sugar units.
Question 6:
Which bond links nucleotides in DNA and RNA?
A. Peptide bond
B. Glycosidic bond
C. Phosphodiester bond
D. Disulfide bond
Correct answer: C
Rationale: Phosphodiester bonds connect nucleotides in nucleic acids.
Question 7:
Water is polar primarily because:
A. It has a linear geometry
B. Oxygen is more electronegative than hydrogen
C. It contains ionic bonds
D. It has no lone pairs
Correct answer: B
Rationale: Oxygen’s higher electronegativity creates partial charges and a bent polar
molecule.
, Question 8:
Which property allows water to dissolve many ionic compounds?
A. Low specific heat
B. Polarity and hydrogen bonding
C. Nonpolarity
D. Low dielectric constant
Correct answer: B
Rationale: Water’s polarity and hydrogen bonding stabilize ions and polar solutes.
Question 9:
Why does water help regulate body temperature?
A. It has a low heat capacity
B. It has a high specific heat
C. It is nonpolar
D. It evaporates instantly
Correct answer: B
Rationale: High specific heat lets water absorb or release heat with little temperature
change.
Question 10:
Sweating cools the body because:
A. Water evaporation absorbs heat
B. Water freezing releases heat
C. Sweat is nonpolar
D. Sweat increases body temperature
Correct answer: A
Rationale: Evaporation of sweat removes heat from the skin.
Question 11:
Hydrogen bonds in water are:
A. Covalent bonds within a water molecule
B. Weak attractions between water molecules
C. Ionic bonds
D. Metallic bonds
Learning
These are original practice questions written for study. They cover common CHEM 210
Module 1 | Biochemistry topics: biomolecules, water, pH/buffers, amino acids,
proteins, enzymes, carbohydrates, lipids, nucleic acids, and clinical applications.
Question 1:
Biochemistry is best defined as the study of:
A. Only inorganic reactions
B. Chemical processes within living organisms
C. Only nuclear reactions
D. Physical properties of metals
Correct answer: B
Rationale: Biochemistry studies the chemical processes and substances in living
organisms.
Question 2:
Which are the four major classes of biomolecules?
A. Carbohydrates, lipids, proteins, nucleic acids
B. Acids, bases, salts, metals
C. Vitamins, minerals, water, oxygen
D. Alkanes, alkenes, alkynes, aromatics
Correct answer: A
Rationale: The four major biomolecule classes are carbohydrates, lipids, proteins, and
nucleic acids.
Question 3:
Which functional group makes a molecule more polar and water-soluble?
A. Methyl
B. Hydroxyl
C. Phenyl
D. Alkyl
Correct answer: B
Rationale: Hydroxyl (—OH) groups increase polarity and hydrogen bonding with water.
,Question 4:
Which bond links amino acids in proteins?
A. Glycosidic bond
B. Peptide bond
C. Phosphodiester bond
D. Ester bond
Correct answer: B
Rationale: Peptide bonds connect amino acids into polypeptides.
Question 5:
Which bond links monosaccharides in carbohydrates?
A. Peptide bond
B. Glycosidic bond
C. Phosphodiester bond
D. Hydrogen bond
Correct answer: B
Rationale: Glycosidic bonds join sugar units.
Question 6:
Which bond links nucleotides in DNA and RNA?
A. Peptide bond
B. Glycosidic bond
C. Phosphodiester bond
D. Disulfide bond
Correct answer: C
Rationale: Phosphodiester bonds connect nucleotides in nucleic acids.
Question 7:
Water is polar primarily because:
A. It has a linear geometry
B. Oxygen is more electronegative than hydrogen
C. It contains ionic bonds
D. It has no lone pairs
Correct answer: B
Rationale: Oxygen’s higher electronegativity creates partial charges and a bent polar
molecule.
, Question 8:
Which property allows water to dissolve many ionic compounds?
A. Low specific heat
B. Polarity and hydrogen bonding
C. Nonpolarity
D. Low dielectric constant
Correct answer: B
Rationale: Water’s polarity and hydrogen bonding stabilize ions and polar solutes.
Question 9:
Why does water help regulate body temperature?
A. It has a low heat capacity
B. It has a high specific heat
C. It is nonpolar
D. It evaporates instantly
Correct answer: B
Rationale: High specific heat lets water absorb or release heat with little temperature
change.
Question 10:
Sweating cools the body because:
A. Water evaporation absorbs heat
B. Water freezing releases heat
C. Sweat is nonpolar
D. Sweat increases body temperature
Correct answer: A
Rationale: Evaporation of sweat removes heat from the skin.
Question 11:
Hydrogen bonds in water are:
A. Covalent bonds within a water molecule
B. Weak attractions between water molecules
C. Ionic bonds
D. Metallic bonds
