Chapter 8 - Photosynthesis
Most plants appear green because chlorophyll
absorbs green light
What are the three parts of an ATP molecule?
adenine, ribose, and three phosphate groups
Organisms, such as plants, that make their own food are called
autotrophs
What happens during photosynthesis?
autotrophs produce carbohydrates
Which of the following is NOT a part of an ATP molecule?
chlorophyll
What is the role of NADP+ in photosynthesis
electron carrier
Carbon dioxide - is one of the principle chemical compounds that living things use to store energy
false, ATP
Organisms that cannot make their own food and must obtain energy from external sources are called
heterotrophs
Why are electron carriers needed for transporting electrons from one part of the chloroplast to another?
high-energy electrons are highly reactive
What is a product of the Calvin cycle?
high-energy sugars
Where are photosystems I and II found?
in the thylakoid membrane
Where in the chloroplast is chlorophyll found?
in the thylakoid membrane
How does the Calvin cycle differ from the light-dependent reactions?
it takes place in the stroma
The Calvin cycle is another name for the
light-independent reactions
Which of the following organisms is a heterotroph?
mushroom
Which of the following is NOT found in the overall reaction for photosynthesis?
nitrogen
If carbon dioxide is completely removed from a plant's environment, what would you expect to happen to the plant's production of high-energy sugars?
no sugars will be produced
Which of the following organisms makes its own food using light energy from the sun?
oak
A student is collecting the gas given off from a plant in bright sunlight at a temperature of 27 degrees C. The gas being collected is probably
oxygen
In the overall equation for photosynthesis, six molecules of carbon dioxide and six molecules of water result in a molecule of sugar and six molecules of
oxygen
Photosynthesis uses sunlight to convert water and carbon dioxide into
oxygen and high-energy sugars
Plants gather energy with light-absorbing molecules called
pigments
A granum is a
stack of thylakoids
The Calvin cycle take place in the
stroma
Which structure in Figure 8-2 represents a single thylakoid?
structure C
Look at Figure 8-1. All of the following are parts of an ADP molecule EXCEPT
structure D
Plants get the energy they need for photosynthesis by absorbing
sunlight
Which of the following activities happens within the stroma?
the Calvin cycle produces sugars
What happens when chlorophyll is struck by sunlight?
the electrons in the chlorophyll molecule become energized
If you continue to increase the intensity of light that a plant receives, what happens?
the rate of photosynthesis increases and then levels off
What makes certain molecules good electron carriers?
they can accept electrons and transfer most of their energy to another molecule
The stroma is the region outside the
thylakoids
Chlorophyll a and chlorophyll b both absorb light very well in the - blue and red regions - of the visible light spectrum
true
Plants gather the sun's energy with light-absorbing molecules called - pigments
true
The majority of the cells have only a small quantity of - ATP - because the ATP functions better like a molecule to store short-term energy
true
Ultimately, the energy that a carnivore, such as a wolf, uses comes from - sunlight
true
Which of the following is NOT a true statement about ATP?
used ATP is discarded by the cell as waste
Where do the light-dependent reactions take place?
within the thylakoid membranes
Which structures shown in Figure 8-1 make up an ATP molecule?
A, B, C, and D
Which of the following is NOT a step in the light-dependent reactions?
ATP and NADPH are used to produce high-energy sugars
What are the products of the light-depended reactions?
ATP, NADPH, and oxygen gas
In Figure 8-1, between which parts of the molecule must the bonds be broken to form and ADP molecule?
C and D
What action contributes to the inside of the thylakoid membrane becoming positively charged during the light-independent reactions?
H+ ions are released as water splits
Which pathway represents the flow of electrons during photosynthesis?
H20 --> NADP+ --> Calvin cycle
Which chemical shown in Figure 8-3 is an electron carrier molecule?
NADP+
Energy is released from ATP when
a phosphate group is removed
