1
BIOD 101 Modules 1-6 & Final Exam Portage
Learning Actual Exam 2026/2027 – Complete
Exam-Style Questions with Detailed Rationales |
Pass Guaranteed – A+ Graded
[MODULE 1: Chemistry of Life & Cell Structure — Questions 1-25]
Q1: Which of the following elements is the primary component of organic molecules, forming
the backbone for carbohydrates, lipids, proteins, and nucleic acids?
A. Oxygen (O)
B. Nitrogen (N)
C. Carbon (C) [CORRECT]
D. Hydrogen (H)
Correct Answer: C
Rationale: Carbon is the foundational element of life due to its ability to form four stable
covalent bonds, allowing for the formation of complex, diverse chains and rings. While
hydrogen, oxygen, and nitrogen are also essential in organic molecules, carbon provides the
structural skeleton. This versatility allows for the vast array of biological macromolecules found
in living organisms.
Q2: Water is essential for life due to its unique properties. Which property of water allows it to
act as an effective solvent for polar molecules like salts and sugars?
A. High specific heat
B. Cohesion and adhesion
C. Polarity [CORRECT]
D. Lower density as a solid
Correct Answer: C
,2
Rationale: Water is a polar molecule, meaning it has a partial positive charge on one end and a
partial negative charge on the other due to the electronegativity of oxygen. This polarity allows
water to form hydrogen bonds with other polar substances, dissolving them effectively. Cohesion
relates to water sticking to itself, and high specific heat relates to temperature resistance, not
solvency.
Q3: A solution with a pH of 3 is considered:
A. Neutral
B. Slightly basic
C. Strongly acidic [CORRECT]
D. Weakly acidic
Correct Answer: C
Rationale: The pH scale ranges from 0 to 14, with 7 being neutral. Values below 7 are acidic; the
lower the number, the higher the concentration of hydrogen ions (
H
+
) and the stronger the acid. A pH of 3 is significantly below 7, classifying it as strongly acidic.
Q4: Which of the following organic molecules is the primary source of quick energy for the cell
and is characterized by a 1:2:1 ratio of Carbon, Hydrogen, and Oxygen?
A. Lipid
B. Protein
C. Carbohydrate [CORRECT]
D. Nucleic Acid
Correct Answer: C
,3
Rationale: Carbohydrates, such as glucose and sucrose, are the body's primary source of
immediate energy. They are composed of carbon, hydrogen, and oxygen usually in a 1:2:1 ratio (
CH
2
O
)_n$. Lipids store long-term energy, proteins provide structure and enzymes, and nucleic acids
store genetic information.
Q5: Which type of bond is responsible for holding two water molecules together and contributes
to surface tension?
A. Covalent bond
B. Ionic bond
C. Hydrogen bond [CORRECT]
D. Peptide bond
Correct Answer: C
Rationale: Hydrogen bonds are weak attractions between a slightly positive hydrogen atom in
one molecule and a slightly negative atom (like oxygen or nitrogen) in another. In water, these
bonds form between the hydrogen of one molecule and the oxygen of another, creating surface
tension and high cohesion. Covalent and ionic bonds are much stronger intramolecular forces.
Q6: Which of the following is the monomer unit of proteins?
A. Monosaccharide
B. Fatty acid
C. Amino acid [CORRECT]
D. Nucleotide
Correct Answer: C
, 4
Rationale: Proteins are polymers made up of monomers called amino acids, which are linked
together by peptide bonds. Monosaccharides are the monomers of carbohydrates, fatty acids are
components of lipids, and nucleotides make up nucleic acids.
Q7: Which of the following organic molecules is hydrophobic (water-fearing) and serves as a
long-term energy storage molecule and structural component of cell membranes?
A. Protein
B. Nucleic Acid
C. Lipid [CORRECT]
D. Carbohydrate
Correct Answer: C
Rationale: Lipids, such as fats and phospholipids, are nonpolar molecules that do not mix well
with water (hydrophobic). They are essential for long-term energy storage (fats) and form the
foundational bilayer of cell membranes due to their amphipathic nature (having both
hydrophobic and hydrophilic parts).
Q8: What is the function of the nucleus in a eukaryotic cell?
A. Protein synthesis
B. Energy production
C. Stores genetic information (DNA) [CORRECT]
D. Digestion and waste removal
Correct Answer: C
Rationale: The nucleus is the control center of the eukaryotic cell, housing the cell's DNA which
contains the genetic instructions for cell growth, reproduction, and function. Protein synthesis
primarily occurs at ribosomes, and energy production occurs in mitochondria.
Q9: Which organelle is responsible for producing ATP through cellular respiration?
A. Ribosome
BIOD 101 Modules 1-6 & Final Exam Portage
Learning Actual Exam 2026/2027 – Complete
Exam-Style Questions with Detailed Rationales |
Pass Guaranteed – A+ Graded
[MODULE 1: Chemistry of Life & Cell Structure — Questions 1-25]
Q1: Which of the following elements is the primary component of organic molecules, forming
the backbone for carbohydrates, lipids, proteins, and nucleic acids?
A. Oxygen (O)
B. Nitrogen (N)
C. Carbon (C) [CORRECT]
D. Hydrogen (H)
Correct Answer: C
Rationale: Carbon is the foundational element of life due to its ability to form four stable
covalent bonds, allowing for the formation of complex, diverse chains and rings. While
hydrogen, oxygen, and nitrogen are also essential in organic molecules, carbon provides the
structural skeleton. This versatility allows for the vast array of biological macromolecules found
in living organisms.
Q2: Water is essential for life due to its unique properties. Which property of water allows it to
act as an effective solvent for polar molecules like salts and sugars?
A. High specific heat
B. Cohesion and adhesion
C. Polarity [CORRECT]
D. Lower density as a solid
Correct Answer: C
,2
Rationale: Water is a polar molecule, meaning it has a partial positive charge on one end and a
partial negative charge on the other due to the electronegativity of oxygen. This polarity allows
water to form hydrogen bonds with other polar substances, dissolving them effectively. Cohesion
relates to water sticking to itself, and high specific heat relates to temperature resistance, not
solvency.
Q3: A solution with a pH of 3 is considered:
A. Neutral
B. Slightly basic
C. Strongly acidic [CORRECT]
D. Weakly acidic
Correct Answer: C
Rationale: The pH scale ranges from 0 to 14, with 7 being neutral. Values below 7 are acidic; the
lower the number, the higher the concentration of hydrogen ions (
H
+
) and the stronger the acid. A pH of 3 is significantly below 7, classifying it as strongly acidic.
Q4: Which of the following organic molecules is the primary source of quick energy for the cell
and is characterized by a 1:2:1 ratio of Carbon, Hydrogen, and Oxygen?
A. Lipid
B. Protein
C. Carbohydrate [CORRECT]
D. Nucleic Acid
Correct Answer: C
,3
Rationale: Carbohydrates, such as glucose and sucrose, are the body's primary source of
immediate energy. They are composed of carbon, hydrogen, and oxygen usually in a 1:2:1 ratio (
CH
2
O
)_n$. Lipids store long-term energy, proteins provide structure and enzymes, and nucleic acids
store genetic information.
Q5: Which type of bond is responsible for holding two water molecules together and contributes
to surface tension?
A. Covalent bond
B. Ionic bond
C. Hydrogen bond [CORRECT]
D. Peptide bond
Correct Answer: C
Rationale: Hydrogen bonds are weak attractions between a slightly positive hydrogen atom in
one molecule and a slightly negative atom (like oxygen or nitrogen) in another. In water, these
bonds form between the hydrogen of one molecule and the oxygen of another, creating surface
tension and high cohesion. Covalent and ionic bonds are much stronger intramolecular forces.
Q6: Which of the following is the monomer unit of proteins?
A. Monosaccharide
B. Fatty acid
C. Amino acid [CORRECT]
D. Nucleotide
Correct Answer: C
, 4
Rationale: Proteins are polymers made up of monomers called amino acids, which are linked
together by peptide bonds. Monosaccharides are the monomers of carbohydrates, fatty acids are
components of lipids, and nucleotides make up nucleic acids.
Q7: Which of the following organic molecules is hydrophobic (water-fearing) and serves as a
long-term energy storage molecule and structural component of cell membranes?
A. Protein
B. Nucleic Acid
C. Lipid [CORRECT]
D. Carbohydrate
Correct Answer: C
Rationale: Lipids, such as fats and phospholipids, are nonpolar molecules that do not mix well
with water (hydrophobic). They are essential for long-term energy storage (fats) and form the
foundational bilayer of cell membranes due to their amphipathic nature (having both
hydrophobic and hydrophilic parts).
Q8: What is the function of the nucleus in a eukaryotic cell?
A. Protein synthesis
B. Energy production
C. Stores genetic information (DNA) [CORRECT]
D. Digestion and waste removal
Correct Answer: C
Rationale: The nucleus is the control center of the eukaryotic cell, housing the cell's DNA which
contains the genetic instructions for cell growth, reproduction, and function. Protein synthesis
primarily occurs at ribosomes, and energy production occurs in mitochondria.
Q9: Which organelle is responsible for producing ATP through cellular respiration?
A. Ribosome
