BIOL180 Midterm Exam Practice
Questions And Correct Answers
(Verified Answers) Plus Rationale 2026
Q&A| Instant Download Pdf
1. Which statement best describes the primary goal of biology as a
scientific discipline?
A. To memorize the names of all living organisms
B. To study living organisms and understand their structures, functions,
interactions, and processes
C. To classify only plants and animals into groups
D. To study only human diseases and treatments
Answer: B
Biology is the scientific study of life, including the structures, functions,
evolution, interactions, and processes that characterize living organisms.
2. Which characteristic is shared by all living organisms?
A. Ability to move from one location to another
B. Ability to produce their own food
C. Organization into cells
D. Presence of a nucleus
Answer: C
,All living organisms are composed of one or more cells, which are
considered the basic units of life.
3. The process by which organisms maintain stable internal conditions
despite external changes is called:
A. Evolution
B. Homeostasis
C. Metabolism
D. Reproduction
Answer: B
Homeostasis refers to the regulation of internal conditions, such as
temperature and pH, to maintain a stable environment for cells.
4. Which level of biological organization includes all ecosystems on
Earth?
A. Community
B. Biosphere
C. Population
D. Organism
Answer: B
The biosphere represents the highest level of biological organization and
includes all regions of Earth where life exists.
5. A hypothesis in science is best described as:
A. A proven scientific law
B. A testable explanation for an observation
C. A random guess without evidence
D. A scientific experiment
Answer: B
,A hypothesis is a proposed explanation that can be tested through
experiments and observations.
6. In a controlled experiment, the variable that is deliberately changed by
the researcher is called the:
A. Dependent variable
B. Control variable
C. Independent variable
D. Constant
Answer: C
The independent variable is the factor intentionally manipulated to
determine its effect on another variable.
7. Which organelle is known as the control center of the cell?
A. Ribosome
B. Nucleus
C. Mitochondrion
D. Golgi apparatus
Answer: B
The nucleus contains DNA and regulates cellular activities by controlling
gene expression.
8. The basic structural and functional unit of life is the:
A. Tissue
B. Organ
C. Cell
D. Molecule
Answer: C
, Cells are the smallest units capable of carrying out all essential processes
required for life.
9. Which scientist is credited with developing the theory of evolution by
natural selection?
A. Gregor Mendel
B. Charles Darwin
C. Louis Pasteur
D. Robert Hooke
Answer: B
Charles Darwin proposed natural selection as the mechanism explaining
how species change over generations.
10. Which type of molecule stores genetic information in living
organisms?
A. Protein
B. Lipid
C. DNA
D. Carbohydrate
Answer: C
DNA contains hereditary information that directs the development and
functioning of organisms.
11. Which element is the main component of organic molecules?
A. Carbon
B. Sodium
C. Calcium
D. Iron
Answer: A
Questions And Correct Answers
(Verified Answers) Plus Rationale 2026
Q&A| Instant Download Pdf
1. Which statement best describes the primary goal of biology as a
scientific discipline?
A. To memorize the names of all living organisms
B. To study living organisms and understand their structures, functions,
interactions, and processes
C. To classify only plants and animals into groups
D. To study only human diseases and treatments
Answer: B
Biology is the scientific study of life, including the structures, functions,
evolution, interactions, and processes that characterize living organisms.
2. Which characteristic is shared by all living organisms?
A. Ability to move from one location to another
B. Ability to produce their own food
C. Organization into cells
D. Presence of a nucleus
Answer: C
,All living organisms are composed of one or more cells, which are
considered the basic units of life.
3. The process by which organisms maintain stable internal conditions
despite external changes is called:
A. Evolution
B. Homeostasis
C. Metabolism
D. Reproduction
Answer: B
Homeostasis refers to the regulation of internal conditions, such as
temperature and pH, to maintain a stable environment for cells.
4. Which level of biological organization includes all ecosystems on
Earth?
A. Community
B. Biosphere
C. Population
D. Organism
Answer: B
The biosphere represents the highest level of biological organization and
includes all regions of Earth where life exists.
5. A hypothesis in science is best described as:
A. A proven scientific law
B. A testable explanation for an observation
C. A random guess without evidence
D. A scientific experiment
Answer: B
,A hypothesis is a proposed explanation that can be tested through
experiments and observations.
6. In a controlled experiment, the variable that is deliberately changed by
the researcher is called the:
A. Dependent variable
B. Control variable
C. Independent variable
D. Constant
Answer: C
The independent variable is the factor intentionally manipulated to
determine its effect on another variable.
7. Which organelle is known as the control center of the cell?
A. Ribosome
B. Nucleus
C. Mitochondrion
D. Golgi apparatus
Answer: B
The nucleus contains DNA and regulates cellular activities by controlling
gene expression.
8. The basic structural and functional unit of life is the:
A. Tissue
B. Organ
C. Cell
D. Molecule
Answer: C
, Cells are the smallest units capable of carrying out all essential processes
required for life.
9. Which scientist is credited with developing the theory of evolution by
natural selection?
A. Gregor Mendel
B. Charles Darwin
C. Louis Pasteur
D. Robert Hooke
Answer: B
Charles Darwin proposed natural selection as the mechanism explaining
how species change over generations.
10. Which type of molecule stores genetic information in living
organisms?
A. Protein
B. Lipid
C. DNA
D. Carbohydrate
Answer: C
DNA contains hereditary information that directs the development and
functioning of organisms.
11. Which element is the main component of organic molecules?
A. Carbon
B. Sodium
C. Calcium
D. Iron
Answer: A
