Chapter 4: Energy
Clicker Questions
by Kristen Curran, University of Wisconsin, Whitewater
Which answer is an example of
potential energy?
1.
2.
3.
4.
Heat from a fire
Sledding down a hill
A candy bar
Walking to your car
In which process would you expect that
the conversion of a form of potential
energy into heat might be useful?
1. The mitochondria produce heat during cellular
respiration which maintains body temperature.
2. In the winter, some of the heat produced by
combustion can be used to maintain the
temperature in the passenger compartment of
your car.
3. The increased cellular respiration when
exercising creates heat and you begin to sweat.
4. 1 and 2
5. All of the above
Which letter in the diagram below is an
example of potential energy?
1.
2.
3.
4.
5.
6.
A
B
C
D
A and C
B and D
A
D
B
C
When a plant in a pot gains weight, which
input into the photosynthesis pathway added
to the weight of the plant?
1.
2.
3.
4.
Carbon harvested from carbon dioxide
Oxygen harvested from carbon dioxide
Hydrogen harvested from water
Oxygen harvested from water
Which wavelength of light would
you expect is NOT absorbed by
chlorophyll a or b?
1.
2.
3.
4.
5.
Red
Yellow
Blue
Green
Purple
Classroom Catalyst
What do chlorophyll and
fireworks have in common?
What do chlorophyll and
fireworks have in common?
1) You have seen that chlorophyll is made up of
pigments that absorb light energy at specific
wavelengths. How is the absorption of energy
by the electron in the pigment and the
firework the same? Are they different?
2) If harnessed in a different way, could the
energy possessed by the excited electrons in
the fireworks be used by plants to make food?
3) What are the energy sources for each?
Follow up question: In the cell, excited
chlorophyll a molecules:
1. return to the normal state after releasing the
energy in the form of light.
2. return to the normal state after passing on
electrons to another molecule.
3. return to the normal state after releasing the
energy to directly form ATP.
4. remain in the normal state after passing on the
energy to chlorophyll b
Review: Which answer is an example of a
molecule with high potential energy?
1.
2.
3.
4.
5.
NADPH
NADP+
H2O
O2
Both 1 and 2
Why does NADPH have a high potential
energy?
1. Because it is used for electron
transport
2. Because it is equivalent to ATP
3. Because it stores energy that is used
to make G3P
4. Because it contains phosphate that
can be put on ADP to form ATP
What is the cost associated with a plant
using C4 or CAM photosynthesis?
1. More energy is used to form sugars.
2. More CO2 is required to form sugars.
3. The harvest of light energy and carbon
fixation are temporally separated.
4. Less water is lost in hot, dry climates.
Review: The energy used by plants
and animals ultimately comes from…
1.
2.
3.
4.
food
soil
sun
air
If glycolysis is very inefficient, why do it?
1. Because pyruvate can be
more water
2. Because pyruvate can be
more CO2
3. Because pyruvate can be
absorb more electrons
4. Because pyruvate can be
to yield more energy
metabolized to yield
metabolized to yield
metabolized to
further metabolized
Energy is obtained from a molecule of
glucose in a stepwise fashion. Why would
this method of harvesting energy be
beneficial to the cell/organism?
1. It is more efficient to form sugars a little bit at a
time rather than all at once.
2. It is more efficient to release energy a little bit
at a time rather than in one giant explosion.
3. It is more efficient to make ATP from ADP than
to make it from scratch.
4. All of the above.
Plants have both chloroplasts and
mitochondria. Why?
1. The mitochondria also synthesize sugars.
2. The mitochondria are used to convert oxygen to
carbon dioxide for the plant.
3. The mitochondria break down sugars produced
by photosynthesis to provide energy for the
cellular work of the plant.
4. The mitochondria break down fat produced by
photosynthesis to provide energy for the cellular
work of the plant.
Which process below uses anaerobic
respiration?
1.
2.
3.
4.
5.
Running 10 miles
Swimming 1 mile
Sprinting 100 meters
Making beer
3 and 4