BIO 201 MIDTERM EXAM – A&P I
2026/2027 QUESTIONS WITH CORRECT
ANSWERS (LATEST ), (A+
GUARANTEE).
1. Which of the following best describes the physiological process of negative feedback?
A. The response of the effector negates or decreases the stimulus to restore homeostasis.
B. The response of the effector increases the stimulus.
C. The control center ignores the signal from the receptor.
D. The process causes a rapid deviation from the set point, such as in blood clotting.
Answer: A
Conceptual Explanation: Negative feedback works by opposing the initial stimulus,
bringing the variable back toward the set point, which is essential for maintaining
homeostasis.
2. Which level of structural organization is defined as a group of similar cells and their
surrounding materials performing a specific function?
A. Organismal level
B. Systemic level
C. Tissue level
,D. Cellular level
Answer: C
Conceptual Explanation: The tissue level consists of groups of similar cells that work
together to perform a common function.
3. An isotope of an element differs in its number of:
A. Neutrons
B. Electrons
C. Protons
D. Positrons
Answer: A
Conceptual Explanation: Isotopes are atoms of the same element that have the same
number of protons but different numbers of neutrons.
4. Which type of chemical bond involves the sharing of electrons between two atoms?
A. Covalent bond
B. Hydrogen bond
C. Ionic bond
D. Van der Waals forces
Answer: A
, Conceptual Explanation: Covalent bonds occur when atoms share one or more pairs of
valence electrons to achieve stability.
5. A solution with a pH of 3 is how many times more acidic than a solution with a pH of 6?
A. 2 times
B. 1,000 times
C. 100 times
D. 30 times
Answer: B
Conceptual Explanation: The pH scale is logarithmic; each unit change represents a 10-
fold change in H+ concentration. (10^3 = 1,000).
6. Which organic molecule is primarily responsible for providing a quick source of energy and
structural support in plants?
A. Lipids
B. Proteins
C. Carbohydrates
D. Nucleic acids
Answer: C
Conceptual Explanation: Carbohydrates like glucose are the primary energy source for
cells, while cellulose provides structural support in plants.
2026/2027 QUESTIONS WITH CORRECT
ANSWERS (LATEST ), (A+
GUARANTEE).
1. Which of the following best describes the physiological process of negative feedback?
A. The response of the effector negates or decreases the stimulus to restore homeostasis.
B. The response of the effector increases the stimulus.
C. The control center ignores the signal from the receptor.
D. The process causes a rapid deviation from the set point, such as in blood clotting.
Answer: A
Conceptual Explanation: Negative feedback works by opposing the initial stimulus,
bringing the variable back toward the set point, which is essential for maintaining
homeostasis.
2. Which level of structural organization is defined as a group of similar cells and their
surrounding materials performing a specific function?
A. Organismal level
B. Systemic level
C. Tissue level
,D. Cellular level
Answer: C
Conceptual Explanation: The tissue level consists of groups of similar cells that work
together to perform a common function.
3. An isotope of an element differs in its number of:
A. Neutrons
B. Electrons
C. Protons
D. Positrons
Answer: A
Conceptual Explanation: Isotopes are atoms of the same element that have the same
number of protons but different numbers of neutrons.
4. Which type of chemical bond involves the sharing of electrons between two atoms?
A. Covalent bond
B. Hydrogen bond
C. Ionic bond
D. Van der Waals forces
Answer: A
, Conceptual Explanation: Covalent bonds occur when atoms share one or more pairs of
valence electrons to achieve stability.
5. A solution with a pH of 3 is how many times more acidic than a solution with a pH of 6?
A. 2 times
B. 1,000 times
C. 100 times
D. 30 times
Answer: B
Conceptual Explanation: The pH scale is logarithmic; each unit change represents a 10-
fold change in H+ concentration. (10^3 = 1,000).
6. Which organic molecule is primarily responsible for providing a quick source of energy and
structural support in plants?
A. Lipids
B. Proteins
C. Carbohydrates
D. Nucleic acids
Answer: C
Conceptual Explanation: Carbohydrates like glucose are the primary energy source for
cells, while cellulose provides structural support in plants.
