BIOL 101
BIOL 101 Module 5 - Original Practice Exam Page 1
, Module 5 Exam
Scope: cellular communication; autocrine, paracrine, endocrine, synaptic and direct-contact signaling; receptors;
GPCRs; receptor tyrosine kinases; ligand-gated ion channels; intracellular receptors; phosphorylation; G proteins;
second messengers; amplification; feedback; signal termination; apoptosis and necrosis.
Select the best answer for each item. The correct answer and rationale follow each question.
BIOL 101 Module 5 Exam | Essential Biology I w/Lab | Portage Learning | Q & A |
2026/2027 Edition (PDF)
1. Which term best matches this description: a cell responds to a signal that it releases itself?
A. Paracrine signaling
B. Autocrine signaling
C. Endocrine signaling
D. Synaptic signaling
Correct Answer: B. Autocrine signaling
Rationale: Autocrine signaling is defined by the fact that a cell responds to a signal that it releases itself. This distinction
is central to understanding Module 5 cell-signaling mechanisms.
2. Which statement best describes Autocrine signaling?
A. it permanently changes the DNA sequence.
B. it requires every cell to express the same receptor.
C. A cell responds to a signal that it releases itself.
D. it prevents all signaling feedback.
Correct Answer: C. A cell responds to a signal that it releases itself.
Rationale: Autocrine signaling is defined by the fact that a cell responds to a signal that it releases itself. This distinction
is central to understanding Module 5 cell-signaling mechanisms.
3. A biology student observes that a cell responds to a signal that it releases itself. Which concept is
being demonstrated?
A. Synaptic signaling
B. Endocrine signaling
C. Paracrine signaling
D. Autocrine signaling
Correct Answer: D. Autocrine signaling
Rationale: Autocrine signaling is defined by the fact that a cell responds to a signal that it releases itself. This distinction
is central to understanding Module 5 cell-signaling mechanisms.
BIOL 101 Module 5 - Original Practice Exam Page 2
, 4. Which Module 5 concept is most directly associated with the following event: a cell responds to a
signal that it releases itself?
A. Paracrine signaling
B. Autocrine signaling
C. Synaptic signaling
D. Endocrine signaling
Correct Answer: B. Autocrine signaling
Rationale: Autocrine signaling is defined by the fact that a cell responds to a signal that it releases itself. This distinction
is central to understanding Module 5 cell-signaling mechanisms.
5. Which term best matches this description: a secreted signal acts mainly on nearby target cells?
A. Paracrine signaling
B. Autocrine signaling
C. Direct contact signaling
D. Endocrine signaling
Correct Answer: A. Paracrine signaling
Rationale: Paracrine signaling is defined by the fact that a secreted signal acts mainly on nearby target cells. This
distinction is central to understanding Module 5 cell-signaling mechanisms.
6. Which statement best describes Paracrine signaling?
A. it requires every cell to express the same receptor.
B. it prevents all signaling feedback.
C. A secreted signal acts mainly on nearby target cells.
D. it permanently changes the DNA sequence.
Correct Answer: C. A secreted signal acts mainly on nearby target cells.
Rationale: Paracrine signaling is defined by the fact that a secreted signal acts mainly on nearby target cells. This
distinction is central to understanding Module 5 cell-signaling mechanisms.
7. A biology student observes that a secreted signal acts mainly on nearby target cells. Which
concept is being demonstrated?
A. Direct contact signaling
B. Autocrine signaling
C. Paracrine signaling
D. Endocrine signaling
Correct Answer: C. Paracrine signaling
Rationale: Paracrine signaling is defined by the fact that a secreted signal acts mainly on nearby target cells. This
distinction is central to understanding Module 5 cell-signaling mechanisms.
BIOL 101 Module 5 - Original Practice Exam Page 3
BIOL 101 Module 5 - Original Practice Exam Page 1
, Module 5 Exam
Scope: cellular communication; autocrine, paracrine, endocrine, synaptic and direct-contact signaling; receptors;
GPCRs; receptor tyrosine kinases; ligand-gated ion channels; intracellular receptors; phosphorylation; G proteins;
second messengers; amplification; feedback; signal termination; apoptosis and necrosis.
Select the best answer for each item. The correct answer and rationale follow each question.
BIOL 101 Module 5 Exam | Essential Biology I w/Lab | Portage Learning | Q & A |
2026/2027 Edition (PDF)
1. Which term best matches this description: a cell responds to a signal that it releases itself?
A. Paracrine signaling
B. Autocrine signaling
C. Endocrine signaling
D. Synaptic signaling
Correct Answer: B. Autocrine signaling
Rationale: Autocrine signaling is defined by the fact that a cell responds to a signal that it releases itself. This distinction
is central to understanding Module 5 cell-signaling mechanisms.
2. Which statement best describes Autocrine signaling?
A. it permanently changes the DNA sequence.
B. it requires every cell to express the same receptor.
C. A cell responds to a signal that it releases itself.
D. it prevents all signaling feedback.
Correct Answer: C. A cell responds to a signal that it releases itself.
Rationale: Autocrine signaling is defined by the fact that a cell responds to a signal that it releases itself. This distinction
is central to understanding Module 5 cell-signaling mechanisms.
3. A biology student observes that a cell responds to a signal that it releases itself. Which concept is
being demonstrated?
A. Synaptic signaling
B. Endocrine signaling
C. Paracrine signaling
D. Autocrine signaling
Correct Answer: D. Autocrine signaling
Rationale: Autocrine signaling is defined by the fact that a cell responds to a signal that it releases itself. This distinction
is central to understanding Module 5 cell-signaling mechanisms.
BIOL 101 Module 5 - Original Practice Exam Page 2
, 4. Which Module 5 concept is most directly associated with the following event: a cell responds to a
signal that it releases itself?
A. Paracrine signaling
B. Autocrine signaling
C. Synaptic signaling
D. Endocrine signaling
Correct Answer: B. Autocrine signaling
Rationale: Autocrine signaling is defined by the fact that a cell responds to a signal that it releases itself. This distinction
is central to understanding Module 5 cell-signaling mechanisms.
5. Which term best matches this description: a secreted signal acts mainly on nearby target cells?
A. Paracrine signaling
B. Autocrine signaling
C. Direct contact signaling
D. Endocrine signaling
Correct Answer: A. Paracrine signaling
Rationale: Paracrine signaling is defined by the fact that a secreted signal acts mainly on nearby target cells. This
distinction is central to understanding Module 5 cell-signaling mechanisms.
6. Which statement best describes Paracrine signaling?
A. it requires every cell to express the same receptor.
B. it prevents all signaling feedback.
C. A secreted signal acts mainly on nearby target cells.
D. it permanently changes the DNA sequence.
Correct Answer: C. A secreted signal acts mainly on nearby target cells.
Rationale: Paracrine signaling is defined by the fact that a secreted signal acts mainly on nearby target cells. This
distinction is central to understanding Module 5 cell-signaling mechanisms.
7. A biology student observes that a secreted signal acts mainly on nearby target cells. Which
concept is being demonstrated?
A. Direct contact signaling
B. Autocrine signaling
C. Paracrine signaling
D. Endocrine signaling
Correct Answer: C. Paracrine signaling
Rationale: Paracrine signaling is defined by the fact that a secreted signal acts mainly on nearby target cells. This
distinction is central to understanding Module 5 cell-signaling mechanisms.
BIOL 101 Module 5 - Original Practice Exam Page 3
