BIO 201 MIDTERM EXAM – A&P I PREP
QUESTIONS WITH CORRECT ANSWERS
(LATEST ), (A+ GUARANTEE).
1. Which of the following best describes the physiological process of negative feedback?
A. The response reinforces the initial stimulus to complete a process.
B. The effector increases the deviation from the set point.
C. The response of the effector negates or reverses the original stimulus.
D. A process that occurs only during pathological states.
Answer: C
Conceptual Explanation: Negative feedback mechanisms act to oppose the initial
stimulus, bringing the variable back toward the homeostatic set point.
2. In a classic homeostatic regulatory loop, which component is responsible for processing
sensory information and determining the appropriate response?
A. Effector
B. Receptor
C. Stimulus
D. Control Center
,Answer: D
Conceptual Explanation: The control center (often the brain or endocrine gland) receives
input from receptors and compares it to a set point to determine the output.
3. An atom with an atomic number of 17 and an atomic mass of 35 has how many neutrons?
A. 17
B. 18
C. 35
D. 52
Answer: B
Conceptual Explanation: The number of neutrons is calculated by subtracting the atomic
number (protons) from the atomic mass (protons + neutrons). 35 - 17 = 18.
4. Which type of chemical bond involves the unequal sharing of electrons between atoms?
A. Nonpolar covalent bond
B. Ionic bond
C. Polar covalent bond
D. Hydrogen bond
Answer: C
, Conceptual Explanation: Polar covalent bonds occur when electrons spend more time
around one nucleus than the other due to differences in electronegativity.
5. A solution with a pH of 3 is how many times more acidic than a solution with a pH of 6?
A. 1000 times
B. 30 times
C. 100 times
D. 2 times
Answer: A
Conceptual Explanation: The pH scale is logarithmic. Each unit represents a 10-fold
change in H+ concentration. A difference of 3 units means 10^3 or 1000 times difference.
6. Which level of protein structure is characterized by alpha-helices and beta-pleated sheets
stabilized by hydrogen bonds?
A. Primary
B. Quaternary
C. Tertiary
D. Secondary
Answer: D
Conceptual Explanation: Secondary structure refers to local folding patterns like helices
and sheets, whereas primary is the sequence and tertiary is the 3D shape.
QUESTIONS WITH CORRECT ANSWERS
(LATEST ), (A+ GUARANTEE).
1. Which of the following best describes the physiological process of negative feedback?
A. The response reinforces the initial stimulus to complete a process.
B. The effector increases the deviation from the set point.
C. The response of the effector negates or reverses the original stimulus.
D. A process that occurs only during pathological states.
Answer: C
Conceptual Explanation: Negative feedback mechanisms act to oppose the initial
stimulus, bringing the variable back toward the homeostatic set point.
2. In a classic homeostatic regulatory loop, which component is responsible for processing
sensory information and determining the appropriate response?
A. Effector
B. Receptor
C. Stimulus
D. Control Center
,Answer: D
Conceptual Explanation: The control center (often the brain or endocrine gland) receives
input from receptors and compares it to a set point to determine the output.
3. An atom with an atomic number of 17 and an atomic mass of 35 has how many neutrons?
A. 17
B. 18
C. 35
D. 52
Answer: B
Conceptual Explanation: The number of neutrons is calculated by subtracting the atomic
number (protons) from the atomic mass (protons + neutrons). 35 - 17 = 18.
4. Which type of chemical bond involves the unequal sharing of electrons between atoms?
A. Nonpolar covalent bond
B. Ionic bond
C. Polar covalent bond
D. Hydrogen bond
Answer: C
, Conceptual Explanation: Polar covalent bonds occur when electrons spend more time
around one nucleus than the other due to differences in electronegativity.
5. A solution with a pH of 3 is how many times more acidic than a solution with a pH of 6?
A. 1000 times
B. 30 times
C. 100 times
D. 2 times
Answer: A
Conceptual Explanation: The pH scale is logarithmic. Each unit represents a 10-fold
change in H+ concentration. A difference of 3 units means 10^3 or 1000 times difference.
6. Which level of protein structure is characterized by alpha-helices and beta-pleated sheets
stabilized by hydrogen bonds?
A. Primary
B. Quaternary
C. Tertiary
D. Secondary
Answer: D
Conceptual Explanation: Secondary structure refers to local folding patterns like helices
and sheets, whereas primary is the sequence and tertiary is the 3D shape.
