Plants use the green pigment chlorophyll to __________________.
store sunlight
reflect sunlight
absorb sunlight
change light energy to heat energy
The role of ___________ is to provide matter for making _________ which is the main output for photosynthesis.
carbon dioxide, sugar
oxygen, water
oxygen, sugar
carbon dioxide, water
The role of water molecules is to produce ____________ and hydrogen ions during the _________________________.
electrons, light-dependent reactions
carbon dioxide, light-dependent reactions
carbon dioxide, light-independent reactions
electrons, light-independent reactions
The purpose of photosystem 1 is to...
intial light absorption
replenishing RuBP
fixing carbon
recharge the electrons
Alan is developing a model of the light-independent reactions of photosynthesis, also known as the Calvin cycle. How should the model show how carbon compounds enter and exit the cycle?
enter as glucose, exit as 3-carbon molecules
enter as glucose, exit as carbon dioxide
enter as carbon dioxide, exit as 3-carbon molecules
enter as carbon dioxide, exit as 6-carbon molecules
In order for the Calvin cycle to occur, ______________________ needs to be present.
Water
NADPH
ATP
Both ATP & NADPH
High-energy electrons are transported from chlorophyll to other molecules in the chloroplast by _______________________.
the thylakoid membranes
electron carriers such as NADP+
pigments such as carotene
the protein ATP synthase
Which of the following gets "fixed" during photosynthesis?
Hydrogen
Glucose
Carbon
Oxygen
Which of the following organisms would be an example of a photosynthetic organism?
amoeba
E. Coli
tigers
Crab grass
What BEST describes the role of light in the overall process of photosynthesis?
Light accepts the energy that is released by small molecules
Light provides energy to break sugars into small molecules
Light accepts the energy that is released by sugars.
Light provides energy for making small molecules into sugars
Which of the following is used by cells to store and release the energy needed to power cellular processes?
DNA
RNA
ATP
NADP+
What BEST describes the roles of photosystem I and photosystem II in the process of photosynthesis?
Transfer e- from a series of intermediates to form NADPH
They form ATP as hydrogen ions cross the thylakoid membrane.
They absorb sunlight and transfer the energy to electrons.
They absorb sunlight and distribute the energy as heat.
Adrianne is explaining why chlorophyll is classified as a plant pigment and how it is useful in photosynthesis. Which property of chlorophyll would be most appropriate for her to cite?
chlorophyll's presence in chloroplasts.
chlorophyll's reactivity with oxygen.
chlorophyll's ability to absorb light.
chlorophyll's green color.
Where does the carbon dioxide come from in photosynthesis?
from the breaking down of ATP into ADP
from the atmosphere
none of the above
from the roots
_______________ are organisms that make their own food.
Herbivores
Autotrophs
Heterotrophs
Omnivores
Why does Carbon Dioxide need to be fixed during photosynthesis?
so the plant can make water
so the plant can actually use the carbon
so the plant can actually use the oxygen
so the plant can break down ATP
A chloroplast contains thylakoid stacks, called ___________, that are surrounded by fluid-filled __________.
stroma, grana
grana, stroma
none of these
chloroplasts, cytoplasm
The splitting of water releases what into the atmosphere?
none of the above
carbon dioxide
oxygen
water vapor
The light-independent reactions of photosynthesis are also known as the ___________________.
carbon cycle
ATP cycle
sugar cycle
Calvin cycle
Which of the following organisms would undergo photosynthesis?
tulip
sunflower
all of these
pea plant
Which is the role of the electron transport chain in the process of photosynthesis?
carrying e- from PS II, to PS I, and to NADP+
removing electrons from the chloroplast
adding energy to the electrons that enter photosystem I
cycling electrons between photosystem I and photosystem II
In the diagram, an arrow leads from the splitting of water, to the two photosystems, and then to NADP+. What process is represented by this arrow?
the movement of electrons along the electron transport chain
the conversion of electrons into sunlight
the formation of high-energy sugars
the cycling of light energy within the photosystems
During the light-dependent reactions of photosynthesis, which event must occur for ATP synthase to function properly?
Molecular oxygen must combine with ATP synthase
Photosystem I and photosystem II must be deactivated
ATP must release a phosphate group to become ADP
H+ ions must pass through a channel within ATP synthase
The light-dependent reactions of photosynthesis occurs in the _____________ of the chloroplast.
all of the above
cytoplasm
stroma
thylakoid membranes
Describe the roles of NADPH and ATP in the light-independent reactions.
providing the oxygen for sugar molecules
absorbing the energy of light & transferring it to electrons
providing the carbon for sugar molecules
supplying the energy necessary to assemble sugar molecules
The clusters of chlorophyll and proteins that absorb sunlight and generate high-energy electrons in the chloroplasts are called ______________________.
transport chains
photosystems
carrier proteins
synthase proteins
One of the products of photosynthesis is _______________.
oxygen
light energy
water
carbon dioxide
Which of the following would be a reactant in the overall equation of photosynthesis?
Glucose
Water
all of the above
Oxygen