AP BIOLOGY UNIT 4 CELL COMMUNICATION
AND CELL CYCLE LATEST EXAM UPDATE 2026
WITH VERIFIED ANSWERS
QUESTION1. Hydrophilic ligands do not cross the cellular membrane and end up using what
kind of receptor?
a. Intracellular receptors (cytoplasmic receptors)
b. Extracellular receptors (cell surface receptors)
c. G-protein-coupled receptors (GPCRs)
d. Ligand-gated ion channels
e. Enzyme-linked receptor - answer-B
QUESTION2. Hydrophobic ligands cross the cellular membrane to use what kind of receptor?
a. Intracellular receptors (cytoplasmic receptors)
b. Extracellular receptors (cell surface receptors)
c. G-protein-coupled receptors (GPCRs)
d. Ligand-gated ion channels
e. Enzyme-linked receptor - answer-A
QUESTION3. Maintaining homeostasis is...
a. The tendency to maintain a fixed constant external environment
b.. The tendency to maintain a stable, relatively constant external environment
c. The tendency to maintain a fixed constant internal environment
d. The tendency to maintain a stable, relatively constant internal environment
,e. The tendency to maintain a high rate of body metabolism - answer-D
QUESTION5. Which of the following processes is a positive feedback mechanism?
a. Temperature regulation
b. Blood pressure regulation
c. Blood sugar regulation
d. Thyroid regulation
e. Blood clotting - answer-E
QUESTION4. Why are so few processes positive feedback mechanisms?
a. Positive feedback mechanisms can be dangerous or fatal since they draw the body into
unnatural situations
b. Positive feedback mechanisms can be dangerous or fatal since it weakens the body and
decreases metabolism rate
c. Positive feedback mechanisms increase the original stimulus to push the variable farther,
which can be unstable and if left unchecked can be dangerous or fatal
d. Positive feedback mechanisms decrease the original stimulus to push the variable farther,
which can be unstable and if left unchecked can be dangerous or fatal
e. The statement is false; there are more positive feedback mechanisms in our body than
negative feedback mechanisms - answer-C
QUESTION5. Thermoregulation is an example of a negative feedback mechanism because...
a. When your body temperature increases (as in a fever), the body metabolizes to increase
your body temperature to kill off diseases
b. When your body temperature increases or decreases, the body metabolizes to return body
temperature to normal
c. When your body temperature decreases (as in a cold environment), the body metabolizes to
decreases your body temperature to conserve energy for later usage
, d. When your body temperature increases or decreases, the body metabolizes to increase or
decrease your body temperature (respectively) in order to kill off diseases or to conserve
energy for later usage (respectively).
e. None of the above - answer-B
QUESTION6. Where is the hypothalamus located and what does it do?
a. Heart; maintain body temperature
b. Heart; maintain heart and breathing rate
c. Brain; maintain body temperature
d. Brain; maintain heart and breathing rate
e. None of the above - answer-C
QUESTION7. Humans sweat in order to...
a. Increase body temperature
b. Decrease body temperature
c. Increase heart rate
d. Decrease heart rate
e. None of the above - answer-B
QUESTIONQuestions 9-10 - Refer to the following list of processes.
I. Gap 1
II. Synthesis
III. Gap 2
IV. Mitosis
V. Cytokinesis
AND CELL CYCLE LATEST EXAM UPDATE 2026
WITH VERIFIED ANSWERS
QUESTION1. Hydrophilic ligands do not cross the cellular membrane and end up using what
kind of receptor?
a. Intracellular receptors (cytoplasmic receptors)
b. Extracellular receptors (cell surface receptors)
c. G-protein-coupled receptors (GPCRs)
d. Ligand-gated ion channels
e. Enzyme-linked receptor - answer-B
QUESTION2. Hydrophobic ligands cross the cellular membrane to use what kind of receptor?
a. Intracellular receptors (cytoplasmic receptors)
b. Extracellular receptors (cell surface receptors)
c. G-protein-coupled receptors (GPCRs)
d. Ligand-gated ion channels
e. Enzyme-linked receptor - answer-A
QUESTION3. Maintaining homeostasis is...
a. The tendency to maintain a fixed constant external environment
b.. The tendency to maintain a stable, relatively constant external environment
c. The tendency to maintain a fixed constant internal environment
d. The tendency to maintain a stable, relatively constant internal environment
,e. The tendency to maintain a high rate of body metabolism - answer-D
QUESTION5. Which of the following processes is a positive feedback mechanism?
a. Temperature regulation
b. Blood pressure regulation
c. Blood sugar regulation
d. Thyroid regulation
e. Blood clotting - answer-E
QUESTION4. Why are so few processes positive feedback mechanisms?
a. Positive feedback mechanisms can be dangerous or fatal since they draw the body into
unnatural situations
b. Positive feedback mechanisms can be dangerous or fatal since it weakens the body and
decreases metabolism rate
c. Positive feedback mechanisms increase the original stimulus to push the variable farther,
which can be unstable and if left unchecked can be dangerous or fatal
d. Positive feedback mechanisms decrease the original stimulus to push the variable farther,
which can be unstable and if left unchecked can be dangerous or fatal
e. The statement is false; there are more positive feedback mechanisms in our body than
negative feedback mechanisms - answer-C
QUESTION5. Thermoregulation is an example of a negative feedback mechanism because...
a. When your body temperature increases (as in a fever), the body metabolizes to increase
your body temperature to kill off diseases
b. When your body temperature increases or decreases, the body metabolizes to return body
temperature to normal
c. When your body temperature decreases (as in a cold environment), the body metabolizes to
decreases your body temperature to conserve energy for later usage
, d. When your body temperature increases or decreases, the body metabolizes to increase or
decrease your body temperature (respectively) in order to kill off diseases or to conserve
energy for later usage (respectively).
e. None of the above - answer-B
QUESTION6. Where is the hypothalamus located and what does it do?
a. Heart; maintain body temperature
b. Heart; maintain heart and breathing rate
c. Brain; maintain body temperature
d. Brain; maintain heart and breathing rate
e. None of the above - answer-C
QUESTION7. Humans sweat in order to...
a. Increase body temperature
b. Decrease body temperature
c. Increase heart rate
d. Decrease heart rate
e. None of the above - answer-B
QUESTIONQuestions 9-10 - Refer to the following list of processes.
I. Gap 1
II. Synthesis
III. Gap 2
IV. Mitosis
V. Cytokinesis
