Which of the following is NOT a part of an ATP molecule?
Energy is released from ATP when
a. ATP is exposed to sunlight.
b. a phosphate group is added.
c. adenine bonds to ribose.
d. a phosphate group is removed.
Organisms, such as plants, that make their own food are called
Organisms that cannot make their own food must obtain energy from external sources are called
What happens during photosynthesis?
a. Heterotrophs produce ATP.
b. Heterotrophs consume ATP.
c. Autotrophs consume carbohydrates.
d. Autotrophs produce carbohydrates.
Plants gather energy with light-absorbing molecules called
Most plants appear green because chlorophyll
a. does not absorb green light.
b. absorbs green light.
c. absorbs violet light.
d. does not absorb violet light.
The stroma is the region outside the
c. plant cells
What happens when the chlorophyll is struck by sunlight?
a. Energy from fat molecules is released.
b. A chemical reaction turns chlorophyll into high energy carbohydrates.
c. The electrons in the chlorophyll molecules become energized.
d. The chlorophyll molecules is broken down into parts.
What makes certain molecules good electron carriers?
a. They can absorb sunlight, which is where all of the high-energy electrons come from.
b. They are very large molecules, so they have lots of room to carry many electrons.
c. They are carbohydrates and have a lot of energy, which allows them to carry electrons.
d. They can accept electrons and transfer most of their energy to another molecule.
A student is collecting the gas given off from a plant in bright sunlight at a temperature of 27C. The gas being collected is probably
b. carbon dioxide
Which of the following is NOT found in the overall reaction for photosynthesis?
c. carbon dioxide
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
Where do the light dependent reactions take place?
a. in the outer membrane of the chloroplasts
b. within the thylakoid membranes
c. within the mitochondria membranes
d. in the stroma of the chloroplast
What are the products of the light-dependent reactions?
a. ATP, NADPH, and oxygen gas
b. oxygen gas and glucose
c. ATP, carbon dioxide gas, and NADPH
d. carbon dioxide gas, oxygen gas, and NADPH
Which of the following is NOT a step in the light-dependent reactions?
a. High-energy electrons move through the electron transport chain.
b. ATP synthase allows H+ ions to pass through the thylakoid membrane
c. Pigments in the photosystem II absorb light
d. ATP and NADPH are used to produce high-energy sugars.
What action contributes to the inside of the thylakoid membrane becoming positively charged during the light-dependent reactions?
a. Carbon dioxide builds up in the stroma.
b. ATP synthase produces ATP from ADP
c. ATP synthase allows H+ ions to pass through the membrane.
d. H+ ions are released as water splits
Which of the following activities happens within the stroma?
a. ATP synthase produces ATP
b. Photosystem I absrbs light
c. The Calvin cycle produces sugars
d. Electrons move through the electron transport chain
Which pathway represents the flow of electrons during photosynthesis?
a. H2O > Photosystem I > Photosystem II
b. Photosystem I > Calvin cycle > NADP+
c. O2 > ADP > Calvin cycle
d. H2O > NADP+ > Calvin cycle
What is a product of the Calvin cycle?
a. high-energy sugars
b. oxygen gas
d. carbon dioxide gas
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?
a. More sugars will be produced.
b. Fewer sugars will be produced at first, but then the plant will recover.
c. No sugars will be produced.
d. The same number of sugars will be produced but without carbon dioxide.
If you continue to increase the intensity of light that a plant receives, what happens?
a. The rate of photosynthesis does not change
b. The rate of photosynthesis increases indefinitely with light intensity.
c. The rate of photosynthesis decreases indefinitely with light intensity.
d. The rate of photosynthesis increases and then levels off.