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BIO 203 PURDUE EXAM 3 NEWEST 2025/2026 NEWEST
ACTUAL EXAM WITH COMPLETE QUESTIONS AND
VERIFIED ANSWERS |ALREADY GRADED A+|
Which of these happens first in an adrenergic synaptic
transmission?
a. Cyclic AMP induces several effects in the cell.
b. ATP is converted to cyclic AMP.
c. G protein dissociates from the NE receptor.
d. Adenylate cyclase is activated.
e. G protein binds to adenylate cyclase. - ANSWER-G protein
dissociates from the NE receptor
True or False: Acetylcholine triggers the synthesis of the second
messenger cAMP only in neurons of the PNS. - ANSWER-False
Using the chart below that show the effect of pilocarpine on the
heart rate and force of contraction for a frog heart, determine
which of the drugs below is most similar to pilocarpine.
a. norepinepherine
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b. acetylcholine
c. atropine
d. ephiepherine - ANSWER-Acetylcholine
The output energy of all receptors is a type of __________
energy.
a. thermal
b. electrical
c. chemical
d. nuclear
e. mechanical - ANSWER-Electrical
Each upward movement of the basilar membrane causes the
stereocilia of the inner hair cells to bend, opening __________
gates.
a. K+
b. Mg2+
c. Na+
d. Cl-
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e. Ca2+ - ANSWER-K+
Changes in cerebrospinal fluid pH are detected by __________.
a. nociceptors
b. mechanoreceptors
c. thermoreceptors
d. proprioceptors
e. chemoreceptors - ANSWER-Chemoreceptors
In a taste bud, which cell produces a receptor potential?
a. Gustatory cells
b. Supporting cells
c. Basal cells
d. Sensory nerve fibers
e. Taste hairs - ANSWER-Gustatory cells
This picture illustrates the electrical excitation of hair cells.
Vibrations of the cochlea cause the stereocilia to bend, pulling
open K+ channels. K+ inflow through the open channels
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depolarizes the hair cell. Based on this, which of the following
statements must be true?
a. There is a higher concentration of K+ in perilymph than in the
intracellular solution of hair cells.
b. There is a lower concentration of K+ in endolymph than in the
intracellular solution of hair cells.
c. There is a higher concentration of K+ in perilymph than in
endolymph.
d. There is a lower concentration of K+ in perilymph than in the
intracellular solution of hair cells.
e. There is a higher concentration of K+ in endolymph than in the
intracellular solution of hair cells. - ANSWER-There is a higher
concentration of K+ in endolymph than in the intracellular solution
of hair cells.
Which of the following is not an analgesic (pain reliever) found
naturally in the central nervous system?
a. Dynorphin
b. Bradykinin
c. Endorphins
BIO 203 PURDUE EXAM 3 NEWEST 2025/2026 NEWEST
ACTUAL EXAM WITH COMPLETE QUESTIONS AND
VERIFIED ANSWERS |ALREADY GRADED A+|
Which of these happens first in an adrenergic synaptic
transmission?
a. Cyclic AMP induces several effects in the cell.
b. ATP is converted to cyclic AMP.
c. G protein dissociates from the NE receptor.
d. Adenylate cyclase is activated.
e. G protein binds to adenylate cyclase. - ANSWER-G protein
dissociates from the NE receptor
True or False: Acetylcholine triggers the synthesis of the second
messenger cAMP only in neurons of the PNS. - ANSWER-False
Using the chart below that show the effect of pilocarpine on the
heart rate and force of contraction for a frog heart, determine
which of the drugs below is most similar to pilocarpine.
a. norepinepherine
, Page |2
b. acetylcholine
c. atropine
d. ephiepherine - ANSWER-Acetylcholine
The output energy of all receptors is a type of __________
energy.
a. thermal
b. electrical
c. chemical
d. nuclear
e. mechanical - ANSWER-Electrical
Each upward movement of the basilar membrane causes the
stereocilia of the inner hair cells to bend, opening __________
gates.
a. K+
b. Mg2+
c. Na+
d. Cl-
, Page |3
e. Ca2+ - ANSWER-K+
Changes in cerebrospinal fluid pH are detected by __________.
a. nociceptors
b. mechanoreceptors
c. thermoreceptors
d. proprioceptors
e. chemoreceptors - ANSWER-Chemoreceptors
In a taste bud, which cell produces a receptor potential?
a. Gustatory cells
b. Supporting cells
c. Basal cells
d. Sensory nerve fibers
e. Taste hairs - ANSWER-Gustatory cells
This picture illustrates the electrical excitation of hair cells.
Vibrations of the cochlea cause the stereocilia to bend, pulling
open K+ channels. K+ inflow through the open channels
, Page |4
depolarizes the hair cell. Based on this, which of the following
statements must be true?
a. There is a higher concentration of K+ in perilymph than in the
intracellular solution of hair cells.
b. There is a lower concentration of K+ in endolymph than in the
intracellular solution of hair cells.
c. There is a higher concentration of K+ in perilymph than in
endolymph.
d. There is a lower concentration of K+ in perilymph than in the
intracellular solution of hair cells.
e. There is a higher concentration of K+ in endolymph than in the
intracellular solution of hair cells. - ANSWER-There is a higher
concentration of K+ in endolymph than in the intracellular solution
of hair cells.
Which of the following is not an analgesic (pain reliever) found
naturally in the central nervous system?
a. Dynorphin
b. Bradykinin
c. Endorphins
