BIOD 101 Module 3 – Application Questions | Fall Semester 2025/2026 | Updated 2026 Edition | Verified Practice Questions with Correct Answers & Rationales | Comprehensive Biology and Anatomy Study Guide

BIOD 101 Module 3 – Application Questions | Fall
Semester 2025/2026 | Updated 2026 Edition |
Verified Practice Questions with Correct Answers &
Rationales | Comprehensive Biology and Anatomy
Study Guide

Question 1
Case: A student observes a cell under a microscope and identifies its nucleus. What is
the primary role of the nucleus?
A) Energy production
B) Storage of genetic information (Correct Option)
C) Protein synthesis
D) Cellular respiration
Rationale: The nucleus serves as the control center of the cell, housing the genetic
material (DNA) that regulates cell activities.


Question 2
Case: A cell is observed to have a well-defined cell wall. What type of organism is this
likely to be?
A) Animal
B) Plant (Correct Option)
C) Fungus
D) Bacterium
Rationale: Plant cells have a rigid cell wall made of cellulose, which provides structure
and support.


Question 3
Case: In a lab, a student is examining mitochondria. What is the primary function of
mitochondria in eukaryotic cells?
A) Photosynthesis
B) ATP production (Correct Option)
C) Protein synthesis
D) Lipid storage
Rationale: Mitochondria are known as the "powerhouses" of the cell because they
generate ATP through cellular respiration.


Question 4
Case: A researcher is studying the process of osmosis. What is the key characteristic of
osmosis?

,A) Movement of solute particles
B) Movement of water across a semipermeable membrane (Correct Option)
C) Active transport of ions
D) Direct energy usage
Rationale: Osmosis specifically refers to the diffusion of water molecules across a
semipermeable membrane.


Question 5
Case: A scientist adds salt to a plant cell's environment and observes that the cell
shrinks. What process is occurring?
A) Plasmolysis (Correct Option)
B) Cytolysis
C) Diffusion
D) Active transport
Rationale: Plasmolysis occurs when a plant cell loses water in a hypertonic solution,
causing it to shrink.


Question 6
Case: During a lab experiment, students are asked to identify the organelle responsible
for protein synthesis. Which organelle is it?
A) Mitochondria
B) Ribosomes (Correct Option)
C) Golgi apparatus
D) Lysosomes
Rationale: Ribosomes are the cellular structures responsible for synthesizing proteins
by translating messenger RNA.


Question 7
Case: A student learns that the Golgi apparatus modifies and packages proteins. What
is its primary role?
A) Energy production
B) Protein modification and sorting (Correct Option)
C) DNA replication
D) Lipid synthesis
Rationale: The Golgi apparatus processes, modifies, and packages proteins for
secretion or use within the cell.

,Question 8
Case: A cell is placed in a hypotonic solution. What is expected to happen to the cell?
A) It will shrink.
B) It will swell and possibly burst. (Correct Option)
C) It will remain the same size.
D) It will undergo plasmolysis.
Rationale: In a hypotonic solution, water enters the cell, causing it to swell and
potentially burst due to increased internal pressure.


Question 9
Case: An experiment involves the movement of molecules from an area of high
concentration to an area of low concentration. What is this process called?
A) Active transport
B) Diffusion (Correct Option)
C) Osmosis
D) Endocytosis
Rationale: Diffusion is the process by which molecules move from an area of higher
concentration to an area of lower concentration, resulting in equal distribution.


Question 10
Case: A cell's plasma membrane is described as selectively permeable. What does this
mean?
A) It allows all substances to pass freely.
B) It allows some substances to pass while restricting others. (Correct Option)
C) It is impermeable to all substances.
D) It only allows water to pass.
Rationale: A selectively permeable membrane controls the entry and exit of specific
substances, allowing for regulated transport.


Question 11
Case: A student learns about cellular respiration. What is the main purpose of this
process?
A) To produce glucose
B) To convert glucose into usable energy (ATP) (Correct Option)
C) To release oxygen
D) To synthesize proteins
Rationale: Cellular respiration is the metabolic process that converts glucose into ATP,
the energy currency of the cell.

, Question 12
Case: A cell undergoes mitosis. What is the primary outcome of this process?
A) Reduction in chromosome number
B) Production of two identical daughter cells (Correct Option)
C) Genetic recombination
D) Formation of gametes
Rationale: Mitosis results in two genetically identical daughter cells, each with the
same number of chromosomes as the parent cell.


Question 13
Case: A student is studying the role of chloroplasts. What is the primary function of
chloroplasts in plant cells?
A) Photosynthesis (Correct Option)
B) Cellular respiration
C) Protein synthesis
D) Lipid storage
Rationale: Chloroplasts are the organelles responsible for photosynthesis, converting
light energy into chemical energy in the form of glucose.


Question 14
Case: A researcher is studying cell communication. What is a common method of
communication between cells?
A) Chemical signaling (Correct Option)
B) Electrical impulses
C) Direct contact only
D) Passive transport
Rationale: Cells often communicate through chemical signals, such as hormones or
neurotransmitters, to coordinate activities.


Question 15
Case: A student observes a cell undergoing cytokinesis. What is occurring during this
process?
A) DNA replication
B) Division of the cytoplasm (Correct Option)
C) Chromosome alignment
D) Nuclear membrane breakdown