Biology 100 Final Exam Study Guide | Expert
Strategies, Review of (70+) Key Practice
Questions and Verified Detailed Answers; for
Guaranteed Success – UO Maine
This Biology 100 Final Exam (72 Questions & Answers) is a highly resource containing
foundational college-level biology concepts. It typically covers cell structure, genetics, cellular
respiration, and macromolecules.
• Use this BIO100 Final Exams set to review prokaryotes, plasma membrane structure,
and protein functions, cell organelles and transport & scientific methods and basic
ecology.
Studying these 72-question set guarantees thorough
preparation for final tests, as they break down heavy biological
concepts into accessible Q&A formats.
Q1. Which option correctly defines a biological population? [Multiple Choice]
A) Members of a single type of living thing, living together in a defined area
B) All living and nonliving things interacting in an area
C) Different species living together in the same habitat
D) A single organism and its internal organs
Answer: Members of a single type of living thing, living together in a defined area
Explanation: A population consists of individuals of the same species occupying a particular area,
which distinguishes it from a community (multiple species) or an ecosystem (includes nonliving
environment). The incorrect options are wrong because they either include multiple species, refer
1
, to individual organisms rather than groups, or describe entire ecosystems rather than a single-
species group in a defined area.
Q2. Which description matches the structure of a phospholipid as found in cell
membranes? [Multiple Choice]
A) A glycerol-linked phosphate head with two fatty-acid tails, a hydrophilic head and
hydrophobic tails
B) A single long chain attached to a glycerol head with no phosphate group
C) A phosphate head and one fatty-acid tail with both parts hydrophilic
D) Two phosphate heads attached to one fatty-acid tail forming a hydrophilic molecule
Answer: A glycerol-linked phosphate head with two fatty-acid tails, a hydrophilic head
and hydrophobic tails
Explanation: A phospholipid contains a glycerol backbone attached to a phosphate group (the
hydrophilic head) and two fatty-acid chains (hydrophobic tails). This amphipathic structure
makes bilayers where heads face water and tails face inward. The incorrect options either omit
the phosphate head, show only one tail, or reverse head/tail polarity, all of which contradict the
structural features that produce membrane bilayers.
Q3. Which pair correctly defines solute and solvent? [Multiple Choice]
A) Solute: substance to be dissolved; Solvent: substance doing the dissolving
B) Solute: medium doing the dissolving; Solvent: substance to be dissolved
C) Both solute and solvent are substances to be dissolved
D) Solute: a type of solvent that evaporates quickly
Answer: Solute: substance to be dissolved; Solvent: substance doing the dissolving
2
, Explanation: A solute is the component that is dissolved (for example, sugar) and the solvent is
the medium that dissolves the solute (for example, water). The incorrect answers either reverse
these roles, describe both as solutes, or misidentify which component performs the dissolving.
Q4. What does homeostasis refer to in biology? [Multiple Choice]
A) Maintaining a constant internal environment
B) Keeping the external environment unchanged
C) Passing genetic information to offspring
D) Maintaining a stable population size
Answer: Maintaining a constant internal environment
Explanation: Homeostasis is the process by which organisms keep internal conditions (like
temperature, pH, and ion concentrations) within narrow limits despite external changes. The
other options are incorrect: maintaining external environment is the opposite idea, inheriting
genetic information describes heredity, and keeping population numbers steady refers to
population dynamics, not the internal regulation of an individual.
Q5. What is the significance of listing biological complexity in the order Atom →
Molecule → Organelle → Cell → Tissue → Organ → System → Organism →
Population → Community → Ecosystem → Biosphere? [Short Answer]
Answer: The order shows biological organization from smallest to largest; each level
builds on the previous, so properties at higher levels emerge from interactions among
lower-level parts.
Explanation: Hierarchy matters because it clarifies how complexity arises: atoms form molecules,
molecules form organelles and cells, and interactions among cells produce tissues, organs, and
ecosystems. Understanding this helps explain why phenomena at one level can't always be
predicted just by studying a single lower-level component.
Q6. Which definition best describes a hydrophobic molecule? [Multiple Choice]
3
, A) A molecule that is repelled by water or is 'water-fearing'
B) A molecule that readily dissolves in water or is 'water-loving'
C) A molecule with both water-attracting and water-repelling regions
D) A molecule that forms strong hydrogen bonds with water molecules
Answer: A molecule that is repelled by water or is 'water-fearing'
Explanation: Hydrophobic molecules do not interact favorably with water and tend to be
excluded from aqueous environments; they are described as 'water-fearing.' The other choices
are incorrect because they describe the opposite (water-loving), a combination of both properties
(amphipathic), or a property (forming hydrogen bonds) that hydrophobic molecules do not
typically exhibit.
Q7. Which of the following best defines a scientific theory? [Multiple Choice]
A) A well-substantiated explanation supported by repeatedly confirmed observations
and experiments
B) A simple predictive statement derived from a single experiment
C) A concise description of an observed pattern without explanation
D) An untested speculative idea based on intuition
Answer: A well-substantiated explanation supported by repeatedly confirmed
observations and experiments
Explanation: A scientific theory is a robust explanatory framework that integrates many facts
and has been repeatedly tested by observation and experiment; it explains why phenomena
occur. The other choices are wrong because they describe less supported ideas: a hypothesis is a
tentative prediction, a scientific law is a concise statement of an observed pattern without the
explanatory detail, and an educated guess lacks the repeated confirmation and explanatory
power required of a theory.
4
Strategies, Review of (70+) Key Practice
Questions and Verified Detailed Answers; for
Guaranteed Success – UO Maine
This Biology 100 Final Exam (72 Questions & Answers) is a highly resource containing
foundational college-level biology concepts. It typically covers cell structure, genetics, cellular
respiration, and macromolecules.
• Use this BIO100 Final Exams set to review prokaryotes, plasma membrane structure,
and protein functions, cell organelles and transport & scientific methods and basic
ecology.
Studying these 72-question set guarantees thorough
preparation for final tests, as they break down heavy biological
concepts into accessible Q&A formats.
Q1. Which option correctly defines a biological population? [Multiple Choice]
A) Members of a single type of living thing, living together in a defined area
B) All living and nonliving things interacting in an area
C) Different species living together in the same habitat
D) A single organism and its internal organs
Answer: Members of a single type of living thing, living together in a defined area
Explanation: A population consists of individuals of the same species occupying a particular area,
which distinguishes it from a community (multiple species) or an ecosystem (includes nonliving
environment). The incorrect options are wrong because they either include multiple species, refer
1
, to individual organisms rather than groups, or describe entire ecosystems rather than a single-
species group in a defined area.
Q2. Which description matches the structure of a phospholipid as found in cell
membranes? [Multiple Choice]
A) A glycerol-linked phosphate head with two fatty-acid tails, a hydrophilic head and
hydrophobic tails
B) A single long chain attached to a glycerol head with no phosphate group
C) A phosphate head and one fatty-acid tail with both parts hydrophilic
D) Two phosphate heads attached to one fatty-acid tail forming a hydrophilic molecule
Answer: A glycerol-linked phosphate head with two fatty-acid tails, a hydrophilic head
and hydrophobic tails
Explanation: A phospholipid contains a glycerol backbone attached to a phosphate group (the
hydrophilic head) and two fatty-acid chains (hydrophobic tails). This amphipathic structure
makes bilayers where heads face water and tails face inward. The incorrect options either omit
the phosphate head, show only one tail, or reverse head/tail polarity, all of which contradict the
structural features that produce membrane bilayers.
Q3. Which pair correctly defines solute and solvent? [Multiple Choice]
A) Solute: substance to be dissolved; Solvent: substance doing the dissolving
B) Solute: medium doing the dissolving; Solvent: substance to be dissolved
C) Both solute and solvent are substances to be dissolved
D) Solute: a type of solvent that evaporates quickly
Answer: Solute: substance to be dissolved; Solvent: substance doing the dissolving
2
, Explanation: A solute is the component that is dissolved (for example, sugar) and the solvent is
the medium that dissolves the solute (for example, water). The incorrect answers either reverse
these roles, describe both as solutes, or misidentify which component performs the dissolving.
Q4. What does homeostasis refer to in biology? [Multiple Choice]
A) Maintaining a constant internal environment
B) Keeping the external environment unchanged
C) Passing genetic information to offspring
D) Maintaining a stable population size
Answer: Maintaining a constant internal environment
Explanation: Homeostasis is the process by which organisms keep internal conditions (like
temperature, pH, and ion concentrations) within narrow limits despite external changes. The
other options are incorrect: maintaining external environment is the opposite idea, inheriting
genetic information describes heredity, and keeping population numbers steady refers to
population dynamics, not the internal regulation of an individual.
Q5. What is the significance of listing biological complexity in the order Atom →
Molecule → Organelle → Cell → Tissue → Organ → System → Organism →
Population → Community → Ecosystem → Biosphere? [Short Answer]
Answer: The order shows biological organization from smallest to largest; each level
builds on the previous, so properties at higher levels emerge from interactions among
lower-level parts.
Explanation: Hierarchy matters because it clarifies how complexity arises: atoms form molecules,
molecules form organelles and cells, and interactions among cells produce tissues, organs, and
ecosystems. Understanding this helps explain why phenomena at one level can't always be
predicted just by studying a single lower-level component.
Q6. Which definition best describes a hydrophobic molecule? [Multiple Choice]
3
, A) A molecule that is repelled by water or is 'water-fearing'
B) A molecule that readily dissolves in water or is 'water-loving'
C) A molecule with both water-attracting and water-repelling regions
D) A molecule that forms strong hydrogen bonds with water molecules
Answer: A molecule that is repelled by water or is 'water-fearing'
Explanation: Hydrophobic molecules do not interact favorably with water and tend to be
excluded from aqueous environments; they are described as 'water-fearing.' The other choices
are incorrect because they describe the opposite (water-loving), a combination of both properties
(amphipathic), or a property (forming hydrogen bonds) that hydrophobic molecules do not
typically exhibit.
Q7. Which of the following best defines a scientific theory? [Multiple Choice]
A) A well-substantiated explanation supported by repeatedly confirmed observations
and experiments
B) A simple predictive statement derived from a single experiment
C) A concise description of an observed pattern without explanation
D) An untested speculative idea based on intuition
Answer: A well-substantiated explanation supported by repeatedly confirmed
observations and experiments
Explanation: A scientific theory is a robust explanatory framework that integrates many facts
and has been repeatedly tested by observation and experiment; it explains why phenomena
occur. The other choices are wrong because they describe less supported ideas: a hypothesis is a
tentative prediction, a scientific law is a concise statement of an observed pattern without the
explanatory detail, and an educated guess lacks the repeated confirmation and explanatory
power required of a theory.
4
