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29 Cards in this Set

  • Front
  • Back
The energy of most living cells comes directly or indirectly from _________.
The sun.
What do light dependent reactions do?
They capture energy from the sun and use it to make ATP and NADPH.
What does the Calvin cycle (light independent reaction) do?
It constructs organic molecules.
List the parts of a leaf cross section from top to bottom.
Cuticle, Epidermis, Mesophyll, Vascular Bundle (Surrounded by Bundle Sheath), and Stoma
Within chloroplasts, there are ______, which are stacks of ________, which contain pigments, which are clustered into _________.
Grana, Thylakoids, Photosystems.
What does a photosystem do?
It acts as an antenae and gathers light energy with its pigment molecules.
What is the space within the chloroplast that isn't occupied by thylakoids?
Over 95% of a plant's dry mass comes from (soil/atmosphere/other).
What do light dependent reactions do to NADP to make ATP?
Reduce it to NADPH.
The reducing power produced by splitting water is used to convert ____ to organic matter during carbon fixation.
The energy of a photon is ________ proportional to the wavelength of the photon.
What are the highest energy photons?
Gamma Rays
What is a molecule's absorption spectrum?
It is the range and efficiency of photons the molecule is capable of absorbing.
Name the three pigments in green plants.
Carotenoids, Chlorophyll A (main pigment), Chlorophyll B (accessory pigment).
How to chlorophylls absorb photons?
The photons excite electrons in the pigment's ring structure, and are channeled away through an alternating carbon bond system.
What are the four stages of light dependent reactions?
1.Primary Photoevent (electron excited) 2.Charge Separation (electron transferred to reaction center) 3.Electron Transport (proton gradient created) 4. Chemiosmosis (ATP synthase makes ATP)
What is the trend of photosystem output as light intensity increases?
It increases linearly and then reaches a saturation point.
What are the two parts of a photosystem?
Antennae complexs (pigments that absorb photons and transfer electrons), Reaction Center (one or more chloropyll a that send the electron out of the photosystem)
How many photosystems do bacteria use? What is the process of their use called?
One. Cyclic Photophosphorylation.
Does cyclic photophosphorylation produce reducing power?
How many photosystems do plants use? What is the process of their use called? Which comes first?
Two. Noncyclic photophosphorylation. Photosystem 2.
Does noncyclic photophosphorylation produce reducing power?
Yes. It converts NADP+ into NADPH.
What does the Calvin Cycle do? What is it also known as? What is the substrate?
It makes organic molecules from CO2. C3 Photosynthesis. 3-Phosphoglycerate.
In C3 plants, the carboxylation of ribulose 1,5 bisphosphate is the result of the activity of what enzyme?
What happens in photorespiration, and why is it useful?
O2 is incorporated into RuBP which undergoes additional reactions that release CO2. This decreases the yield of photosynthesis.
What do plants do in hot conditions that could make them lose water? What is the negative side effect?
They close their stomata. They cannot get their CO2 supply and O2 builds up.
Where does the C4 pathway occur and what reaction is also taking place at the same time? How does this help the cell?
The mesophyll cells. The Calvin cycle in the bundle sheath cells. It isolates CO2 production spacially so the light dependent reactions can still occur.
What do Crassulacean Acid Metabolism plants do? How does this help the cell?
They open their stomata only at night. It isolates CO2 temporally so the light dependent reactions can still occur.
Who made these flashcards?
Robert Fromm