Page 1 of 142
Introduction to Biology Final StraighterLine Exam
ACTUAL QUESTIONS AND ANSWERS LATEST UPDATE
THIS YEAR
Introduction to Biology Final Practice Exam in the style of StraighterLine’s course.
The exam covers cellular biology, metabolism, genetics, evolution, and ecology.
Question 1
Which organelle is responsible for producing ATP through cellular respiration in eukaryotic cells?
A) Nucleus
B) Ribosome
C) Mitochondrion
D) Golgi apparatus
Answer: C
Mitochondria are the “powerhouses” of the cell, converting glucose and oxygen into ATP via oxidative
phosphorylation.
Question 2
A scientist observes that a cell contains a nucleus, mitochondria, and chloroplasts. This cell most likely
belongs to which kingdom?
, Page 2 of 142
A) Animalia
B) Plantae
C) Fungi
D) Protista (algae) – some protists have chloroplasts, but the best answer from the options is Plantae.
Answer: B
Plant cells have both mitochondria (for cellular respiration) and chloroplasts (for photosynthesis); animal
and fungal cells lack chloroplasts.
Question 3
During protein synthesis, the process of copying a gene’s DNA sequence into messenger RNA occurs in
the nucleus. What is this process called?
A) Translation
B) Replication
C) Transcription
D) Transformation
Answer: C
Transcription is the synthesis of mRNA from a DNA template; translation occurs on ribosomes.
, Page 3 of 142
Question 4
A patient has a genetic disorder in which lysosomes lack functional hydrolytic enzymes. Which cellular
process would be directly impaired?
A) ATP production
B) Intracellular digestion and waste removal
C) Protein synthesis
D) Lipid synthesis
Answer: B
Lysosomes contain digestive enzymes that break down macromolecules and worn-out organelles;
dysfunctional lysosomes lead to accumulation of undigested material.
Question 5
Which of the following best describes the fluid mosaic model of the plasma membrane?
A) A rigid layer of phospholipids with embedded cholesterol
B) A bilayer of phospholipids with proteins that can move laterally
C) A single layer of proteins with embedded carbohydrates
D) A double layer of cellulose with pores
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Answer: B
The fluid mosaic model describes a dynamic phospholipid bilayer with embedded proteins that can
diffuse laterally.
Question 6
In a hypotonic solution, an animal cell will likely:
A) Shrink (crenate)
B) Swell and possibly burst (lyse)
C) Remain unchanged
D) Plasmolyze
Answer: B
Water moves into the cell by osmosis in a hypotonic environment; animal cells lack a cell wall and may
lyse.
Question 7
A plant cell placed in a hypertonic solution will undergo:
A) Cytolysis
Introduction to Biology Final StraighterLine Exam
ACTUAL QUESTIONS AND ANSWERS LATEST UPDATE
THIS YEAR
Introduction to Biology Final Practice Exam in the style of StraighterLine’s course.
The exam covers cellular biology, metabolism, genetics, evolution, and ecology.
Question 1
Which organelle is responsible for producing ATP through cellular respiration in eukaryotic cells?
A) Nucleus
B) Ribosome
C) Mitochondrion
D) Golgi apparatus
Answer: C
Mitochondria are the “powerhouses” of the cell, converting glucose and oxygen into ATP via oxidative
phosphorylation.
Question 2
A scientist observes that a cell contains a nucleus, mitochondria, and chloroplasts. This cell most likely
belongs to which kingdom?
, Page 2 of 142
A) Animalia
B) Plantae
C) Fungi
D) Protista (algae) – some protists have chloroplasts, but the best answer from the options is Plantae.
Answer: B
Plant cells have both mitochondria (for cellular respiration) and chloroplasts (for photosynthesis); animal
and fungal cells lack chloroplasts.
Question 3
During protein synthesis, the process of copying a gene’s DNA sequence into messenger RNA occurs in
the nucleus. What is this process called?
A) Translation
B) Replication
C) Transcription
D) Transformation
Answer: C
Transcription is the synthesis of mRNA from a DNA template; translation occurs on ribosomes.
, Page 3 of 142
Question 4
A patient has a genetic disorder in which lysosomes lack functional hydrolytic enzymes. Which cellular
process would be directly impaired?
A) ATP production
B) Intracellular digestion and waste removal
C) Protein synthesis
D) Lipid synthesis
Answer: B
Lysosomes contain digestive enzymes that break down macromolecules and worn-out organelles;
dysfunctional lysosomes lead to accumulation of undigested material.
Question 5
Which of the following best describes the fluid mosaic model of the plasma membrane?
A) A rigid layer of phospholipids with embedded cholesterol
B) A bilayer of phospholipids with proteins that can move laterally
C) A single layer of proteins with embedded carbohydrates
D) A double layer of cellulose with pores
, Page 4 of 142
Answer: B
The fluid mosaic model describes a dynamic phospholipid bilayer with embedded proteins that can
diffuse laterally.
Question 6
In a hypotonic solution, an animal cell will likely:
A) Shrink (crenate)
B) Swell and possibly burst (lyse)
C) Remain unchanged
D) Plasmolyze
Answer: B
Water moves into the cell by osmosis in a hypotonic environment; animal cells lack a cell wall and may
lyse.
Question 7
A plant cell placed in a hypertonic solution will undergo:
A) Cytolysis
