UA BSC 108 EXAM– QUESTIONS AND ANSWERS | VERIFIED AND WELL DETAILED ANSWERS | PLUS RATIONALES |
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Core Domains
Foundations of Biological Science
Cell Structure and Function
Genetics and Molecular Biology
Evolution and Natural Selection
Ecology and Environmental Science
Human Anatomy and Physiology
Microbiology and Disease
Scientific Method and Experimental Design
Ethics in Biological Research
Biotechnology and Its Applications
Introduction
This comprehensive examination is designed to assess a student's mastery of fundamental biological concepts and their
ability to apply this knowledge in various contexts. It evaluates understanding of core principles, from cellular processes
,to ecosystem dynamics, alongside critical thinking and analytical skills. The assessment utilizes a combination of
multiple-choice and scenario-based questions to test not only factual recall but also the application of biological
knowledge to real-world situations. A significant emphasis is placed on decision-making, ethical considerations, and
the interpretation of scientific data, preparing students for advanced study and professional practice in the biological
sciences.
SECTION ONE: QUESTIONS 1–50
1. Which of the following is the primary function of the mitochondrion in a eukaryotic cell?
A. Protein synthesis
B. Lipid synthesis
C. ATP production
D. Waste breakdown
🟢 Correct Answer: C. ATP production
🔴 Explanation: The mitochondrion is famously known as the powerhouse of the cell, and its primary role is to
generate adenosine triphosphate (ATP) through the process of cellular respiration, providing energy for cellular
activities.
,2. A patient presents with a bacterial infection. A physician prescribes an antibiotic that specifically targets the
70S ribosome. Which of the following is the most likely mechanism of action for this drug?
A. Inhibition of DNA replication
B. Inhibition of protein synthesis
C. Disruption of the cell membrane
D. Inhibition of cell wall synthesis
🟢 Correct Answer: B. Inhibition of protein synthesis
🔴 Explanation: The 70S ribosome is a component of the protein synthesis machinery found in prokaryotes like
bacteria. Antibiotics targeting this structure, such as aminoglycosides or macrolides, work by inhibiting bacterial
protein synthesis, which is selectively toxic as human ribosomes are 80S.
3. In a classic Mendelian monohybrid cross between two heterozygous tall pea plants (Tt), what is the expected
phenotypic ratio of the offspring?
A. 1:1
B. 3:1
C. 1:2:1
D. 9:3:3:1
🟢 Correct Answer: B. 3:1
, 🔴 Explanation: A cross between two heterozygotes (Tt x Tt) yields a genotypic ratio of 1 TT : 2 Tt : 1 tt. Since both
TT and Tt express the dominant tall phenotype, the resulting phenotypic ratio is 3 tall plants to 1 short plant.
4. Which of the following best describes the process of natural selection?
A. Organisms acquire traits during their lifetime and pass them to offspring.
B. All organisms have an equal chance of survival and reproduction.
C. Individuals with traits better suited to their environment are more likely to survive and reproduce.
D. Genetic drift is the primary mechanism of evolutionary change.
🟢 Correct Answer: C. Individuals with traits better suited to their environment are more likely to survive and
reproduce.
🔴 Explanation: Natural selection is the differential survival and reproduction of individuals due to differences in
phenotype. It is a key mechanism of evolution, where advantageous heritable traits become more common in a
population over generations.
5. A researcher is studying a newly discovered organism. It is multicellular, heterotrophic, and its cells lack a cell
wall. To which kingdom does this organism most likely belong?
A. Plantae
B. Fungi
DOWNLOAD AND PASS | LATEST EXAM UPDATE 2026/2027
Core Domains
Foundations of Biological Science
Cell Structure and Function
Genetics and Molecular Biology
Evolution and Natural Selection
Ecology and Environmental Science
Human Anatomy and Physiology
Microbiology and Disease
Scientific Method and Experimental Design
Ethics in Biological Research
Biotechnology and Its Applications
Introduction
This comprehensive examination is designed to assess a student's mastery of fundamental biological concepts and their
ability to apply this knowledge in various contexts. It evaluates understanding of core principles, from cellular processes
,to ecosystem dynamics, alongside critical thinking and analytical skills. The assessment utilizes a combination of
multiple-choice and scenario-based questions to test not only factual recall but also the application of biological
knowledge to real-world situations. A significant emphasis is placed on decision-making, ethical considerations, and
the interpretation of scientific data, preparing students for advanced study and professional practice in the biological
sciences.
SECTION ONE: QUESTIONS 1–50
1. Which of the following is the primary function of the mitochondrion in a eukaryotic cell?
A. Protein synthesis
B. Lipid synthesis
C. ATP production
D. Waste breakdown
🟢 Correct Answer: C. ATP production
🔴 Explanation: The mitochondrion is famously known as the powerhouse of the cell, and its primary role is to
generate adenosine triphosphate (ATP) through the process of cellular respiration, providing energy for cellular
activities.
,2. A patient presents with a bacterial infection. A physician prescribes an antibiotic that specifically targets the
70S ribosome. Which of the following is the most likely mechanism of action for this drug?
A. Inhibition of DNA replication
B. Inhibition of protein synthesis
C. Disruption of the cell membrane
D. Inhibition of cell wall synthesis
🟢 Correct Answer: B. Inhibition of protein synthesis
🔴 Explanation: The 70S ribosome is a component of the protein synthesis machinery found in prokaryotes like
bacteria. Antibiotics targeting this structure, such as aminoglycosides or macrolides, work by inhibiting bacterial
protein synthesis, which is selectively toxic as human ribosomes are 80S.
3. In a classic Mendelian monohybrid cross between two heterozygous tall pea plants (Tt), what is the expected
phenotypic ratio of the offspring?
A. 1:1
B. 3:1
C. 1:2:1
D. 9:3:3:1
🟢 Correct Answer: B. 3:1
, 🔴 Explanation: A cross between two heterozygotes (Tt x Tt) yields a genotypic ratio of 1 TT : 2 Tt : 1 tt. Since both
TT and Tt express the dominant tall phenotype, the resulting phenotypic ratio is 3 tall plants to 1 short plant.
4. Which of the following best describes the process of natural selection?
A. Organisms acquire traits during their lifetime and pass them to offspring.
B. All organisms have an equal chance of survival and reproduction.
C. Individuals with traits better suited to their environment are more likely to survive and reproduce.
D. Genetic drift is the primary mechanism of evolutionary change.
🟢 Correct Answer: C. Individuals with traits better suited to their environment are more likely to survive and
reproduce.
🔴 Explanation: Natural selection is the differential survival and reproduction of individuals due to differences in
phenotype. It is a key mechanism of evolution, where advantageous heritable traits become more common in a
population over generations.
5. A researcher is studying a newly discovered organism. It is multicellular, heterotrophic, and its cells lack a cell
wall. To which kingdom does this organism most likely belong?
A. Plantae
B. Fungi
