,BIOL251/BIOL 251 Human Anatomy & Physiology I w/Lab Final
Module Exam | Portage Learning | 2026 Edition (PDF)
1. Which of the following best describes the anatomical position?
A) Body lying face down, arms at sides
B) Body standing erect, feet parallel, palms facing forward
C) Body sitting upright with legs extended
D) Body lying on the side with arms folded
Correct Answer: Body standing erect, feet parallel, palms facing forward
Rationale: The anatomical position is the standard reference point in anatomy: the body is upright, feet
are parallel and flat on the floor, and palms face anteriorly. This position allows for consistent
description of structures and directional terms. Lying face down is the prone position.
2. The study of the structure of the human body is called:
A) Physiology
B) Histology
C) Anatomy
D) Cytology
Correct Answer: Anatomy
Rationale: Anatomy is the study of the structure of the body and the relationships among its parts.
Physiology is the study of function, histology is the microscopic study of tissues, and cytology is the
study of cells.
3. The smallest structural and functional unit of life is the:
A) Tissue
B) Organ
C) Cell
,D) Molecule
Correct Answer: Cell
Rationale: The cell is the basic unit of structure and function in all living organisms. Tissues are groups of
similar cells, organs are composed of tissues, and molecules are chemical components of cells.
4. A solution with a pH of 3 is considered:
A) Neutral
B) Slightly acidic
C) Strongly acidic
D) Strongly basic
Correct Answer: Strongly acidic
Rationale: The pH scale ranges from 0 to 14, with 7 being neutral. Values below 7 are acidic, and the
lower the pH, the stronger the acid. A pH of 3 is strongly acidic.
5. Which type of bond forms when electrons are shared between atoms?
A) Ionic bond
B) Covalent bond
C) Hydrogen bond
D) Peptide bond
Correct Answer: Covalent bond
Rationale: A covalent bond forms when two atoms share one or more pairs of valence electrons. Ionic
bonds involve the transfer of electrons, and hydrogen bonds are weak attractions between polar
molecules.
, 6. Water is considered a polar molecule because:
A) It has a linear shape
B) It has an unequal distribution of electrical charge
C) It is composed of nonpolar covalent bonds
D) It is a good solvent for nonpolar substances
Correct Answer: It has an unequal distribution of electrical charge
Rationale: Water is polar because oxygen is more electronegative than hydrogen, creating a partial
negative charge on the oxygen and partial positive charges on the hydrogens. This unequal distribution
of charge allows water to form hydrogen bonds.
7. The primary function of the cell membrane is to:
A) Produce energy for the cell
B) Control what enters and leaves the cell
C) Store genetic material
D) Synthesize proteins
Correct Answer: Control what enters and leaves the cell
Rationale: The cell membrane is selectively permeable, regulating the passage of substances into and
out of the cell. It maintains cellular homeostasis by controlling the internal environment.
8. Which organelle is responsible for producing ATP through cellular respiration?
A) Ribosome
B) Golgi apparatus
C) Mitochondria
D) Endoplasmic reticulum
Correct Answer: Mitochondria
Module Exam | Portage Learning | 2026 Edition (PDF)
1. Which of the following best describes the anatomical position?
A) Body lying face down, arms at sides
B) Body standing erect, feet parallel, palms facing forward
C) Body sitting upright with legs extended
D) Body lying on the side with arms folded
Correct Answer: Body standing erect, feet parallel, palms facing forward
Rationale: The anatomical position is the standard reference point in anatomy: the body is upright, feet
are parallel and flat on the floor, and palms face anteriorly. This position allows for consistent
description of structures and directional terms. Lying face down is the prone position.
2. The study of the structure of the human body is called:
A) Physiology
B) Histology
C) Anatomy
D) Cytology
Correct Answer: Anatomy
Rationale: Anatomy is the study of the structure of the body and the relationships among its parts.
Physiology is the study of function, histology is the microscopic study of tissues, and cytology is the
study of cells.
3. The smallest structural and functional unit of life is the:
A) Tissue
B) Organ
C) Cell
,D) Molecule
Correct Answer: Cell
Rationale: The cell is the basic unit of structure and function in all living organisms. Tissues are groups of
similar cells, organs are composed of tissues, and molecules are chemical components of cells.
4. A solution with a pH of 3 is considered:
A) Neutral
B) Slightly acidic
C) Strongly acidic
D) Strongly basic
Correct Answer: Strongly acidic
Rationale: The pH scale ranges from 0 to 14, with 7 being neutral. Values below 7 are acidic, and the
lower the pH, the stronger the acid. A pH of 3 is strongly acidic.
5. Which type of bond forms when electrons are shared between atoms?
A) Ionic bond
B) Covalent bond
C) Hydrogen bond
D) Peptide bond
Correct Answer: Covalent bond
Rationale: A covalent bond forms when two atoms share one or more pairs of valence electrons. Ionic
bonds involve the transfer of electrons, and hydrogen bonds are weak attractions between polar
molecules.
, 6. Water is considered a polar molecule because:
A) It has a linear shape
B) It has an unequal distribution of electrical charge
C) It is composed of nonpolar covalent bonds
D) It is a good solvent for nonpolar substances
Correct Answer: It has an unequal distribution of electrical charge
Rationale: Water is polar because oxygen is more electronegative than hydrogen, creating a partial
negative charge on the oxygen and partial positive charges on the hydrogens. This unequal distribution
of charge allows water to form hydrogen bonds.
7. The primary function of the cell membrane is to:
A) Produce energy for the cell
B) Control what enters and leaves the cell
C) Store genetic material
D) Synthesize proteins
Correct Answer: Control what enters and leaves the cell
Rationale: The cell membrane is selectively permeable, regulating the passage of substances into and
out of the cell. It maintains cellular homeostasis by controlling the internal environment.
8. Which organelle is responsible for producing ATP through cellular respiration?
A) Ribosome
B) Golgi apparatus
C) Mitochondria
D) Endoplasmic reticulum
Correct Answer: Mitochondria
