Chapter 44 – Sensory Systems
98. Researchers studying olfactory and taste receptors have stumbled upon an unusual
phenomenon. These receptor proteins are sometimes expressed in other animal tissues in
addition to the nose or tongue. For example, the sweet taste receptor T1R2 is expressed in the
pancreas. Suggest the best possible explanation for these findings.
Chapter 44 – Sensory Systems
44–80
Clarify Question
What is the key concept addressed by the question?
What type of thinking is required?
Gather Content
What do you already know about taste receptors? What other information is related to the
question?
Choose Answer
Given what you now know, what information is most likely to produce the correct answer?
Reflect on Process
Did your problem-solving process lead you to the correct answer? If not, where did the
process break down or lead you astray? How can you revise your approach to produce a
more desirable result?
Chapter 44 – Sensory Systems
99. Misexpression of the Pax6 gene was shown to promote eye development in both
vertebrates and invertebrates. The authors of this study suggested that this was evidence that
eyes evolved only once. What other evidence contradicts this view?
Chapter 44 – Sensory Systems
44–82
Clarify Question
What is the key concept addressed by the question?
What type of thinking is required?
Gather Content
What do you already know about eyes? What other information is related to the question?
Choose Answer
Given what you now know, what information is most likely to produce the correct answer?
Reflect on Process
Did your problem-solving process lead you to the correct answer? If not, where did the
process break down or lead you astray? How can you revise your approach to produce a
more desirable result?
Chapter 44 – Sensory Systems
100. What statement best summarizes the evolutionary history of eyes?
Chapter 44 – Sensory Systems
44–84
Clarify Question
What is the key concept addressed by the question?
What type of thinking is required?
Gather Content
What do you already know about eyes? What other information is related to the question?
Choose Answer
Given what you now know, what information is most likely to produce the correct answer?
Reflect on Process
Did your problem-solving process lead you to the correct answer? If not, where did the
process break down or lead you astray? How can you revise your approach to produce a
more desirable result?
Chapter 44 – Sensory Systems
44–85
101. Peripheral shadows or flashes of light can be a sign that the retina is peeling away from
the layer below. Why is detachment of the retina a medical emergency?
Chapter 44 – Sensory Systems
44–86
Clarify Question
What is the key concept addressed by the question?
What type of thinking is required?
Gather Content
What do you already know about the retina? What other information is related to the
question?
Choose Answer
Given what you now know, what information is most likely to produce the correct answer?
Reflect on Process
Did your problem-solving process lead you to the correct answer? If not, where did the
process break down or lead you astray? How can you revise your approach to produce a
more desirable result?
Chapter 44 – Sensory Systems
102. After your eye exam, the optometrist breaks the bad news: “Your lens is a little too flat,
and as a result it is focuses the image just in front of your retina.” What kind of vision do you
have?
103. Why are carrots said to be good for you?
Chapter 44 – Sensory Systems
Clarify Question
What is the key concept addressed by the question?
What type of thinking is required?
Gather Content
What do you already know about carrots? What other information is related to the
question?
Choose Answer
Given what you now know, what information is most likely to produce the correct answer?
Reflect on Process
Did your problem-solving process lead you to the correct answer? If not, where did the
process break down or lead you astray? How can you revise your approach to produce a
more desirable result?
Chapter 44 – Sensory Systems
104. At night, faint objects are best seen when not looked at directly. What is the basis of this
phenomenon?
Chapter 44 – Sensory Systems
44–90
Clarify Question
What is the key concept addressed by the question?
What type of thinking is required?
Gather Content
What do you already know about vision? What other information is related to the
question?
Choose Answer
Given what you now know, what information is most likely to produce the correct answer?
Reflect on Process
Did your problem-solving process lead you to the correct answer? If not, where did the
process break down or lead you astray? How can you revise your approach to produce a
more desirable result?
Chapter 44 – Sensory Systems
Matching Questions
105. Match the specialized sense to the role it plays.
Multiple Choice Questions
106. The ampullae of Lorenzini are jelly-filled pores that allow fish to sense electromagnetic
currents. What is an important property of the jelly in these organs?
Chapter 44 – Sensory Systems
44–92
Clarify Question
What is the key concept addressed by the question?
What type of thinking is required?
Gather Content
What do you already know about electroreception? What other information is related to
the question?
Choose Answer
Given what you now know, what information is most likely to produce the correct answer?
Reflect on Process
Did your problem-solving process lead you to the correct answer? If not, where did the
process break down or lead you astray? How can you revise your approach to produce a
more desirable result?
Chapter 44 – Sensory Systems
44–93
107. A research strain of mice has a mutation that causes voltage-gated sodium channels to
take longer to return to the active state after a spike. What is the likely consequence for
transduction of sensory stimuli?
Chapter 44 – Sensory Systems
44–94
Clarify Question
What is the key concept addressed by the question?
What type of thinking is required?
Gather Content
What do you already know about action potentials? What other information is related to
the question?
Choose Answer
Given what you now know, what information is most likely to produce the correct answer?
Reflect on Process
Did your problem-solving process lead you to the correct answer? If not, where did the
process break down or lead you astray? How can you revise your approach to produce a
more desirable result?
Chapter 44 – Sensory Systems