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Exam 2-Chapters 7-11Return to Assessment showing page 1-6 out of 6

Exam
2-Chapters 7-11
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92.5/ 100.0 Points
Question 1
2.5
/ 2.5 Points
Some cell processes are influenced by multiple signaling pathways that converge on the same
molecular targets.
Does this provide a selective advantage to the organism?
A. No. The possibility of getting “mixed signals” creates confusion for the cell.
B. Somewhat. The organism saves energy by not having to synthesize the components
for independent pathways, but it runs the risk of having the cell make a mistake in its
response to input.
C. It is neutral. There are just a few ways a cell can respond to input anyway, so
pathways often have to overlap.
D. Yes. This can enhance the “intelligence” of the cell, by allowing it to
integrate information, and respond to certain inputs based on context.
Feedback: Integrating signaling pathways is often a smart thing for an organism to do.
For instance, consider plant stomata – the pores that control water and gas exchange in
leaves. According to Gregory Bertoni in The Plant Cell, “[Stomata] represent a critical
control point... Stomatal development and function depend upon a variety of exogenous
and endogenous signals, including light, carbon dioxide, temperature, water stress, and
abscisic acid levels, as well as upon activities of cellular regulatory proteins and
microRNAs. Therefore, stomata have been extensively studied as a model system for
understanding how the integration of multiple signaling pathways leads to specific
developmental and physiological responses.”
Feedback:Learning Objective: Analyze intercellular and intracellular communication
Question 2
2.5
/ 2.5 Points
If a researcher looks at a cell and notices a straight line of sister chromatids, which phase are
they viewing?
A. interphase
B. prophase
C. prometaphase
D. metaphase
E. anaphase
F. telophase
Feedback:Correct
Question 3
2.5
/ 2.5 Points
Which environment would tend to have plants with the broadest leaves?
A. tropical rainforest canopy
B. tropical rainforest floor
C. desert
D. midwestern prairie
Feedback:Correct
Question 4
2.5
/ 2.5 Points
Where are most of the enzymes for the ETC located?
A. intermembrane space
B. inner mitochondrial membrane
C. matrix
D. outer mitochondrial membrane
Feedback:Learning Objective: Describe how electrons move through the electron transport chain
and what happens to their energy levels
Question 5
0.0
/ 2.5 Points
C
6
H
12
O
6
+ 6O
2
→ 6H
2
O + 6CO
2
is an example of
. (This question refers to what is
occurring on the right side of the reaction.)
A. anabolism
B. synthesis
C. oxidation
D. reduction
Feedback:Learning objective: Discuss the importance of electrons in the transfer of energy in
living systems