What are the 3 stages of photosynthesis?
The stages of photosynthesis
| Stage | Location | Events |
|---|---|---|
| Light-dependent reactions | Thylakoid membrane | Light energy is captured by chloroplasts and stored as ATP |
| Calvin cycle | Stroma | ATP is used to create sugars that the plant will use to grow and live |
Which of the two main components of photosynthesis requires light and why?
1: The two stages of photosynthesis: Photosynthesis takes place in two stages: light-dependent reactions and the Calvin cycle (light-independent reactions). Light-dependent reactions, which take place in the thylakoid membrane, use light energy to make ATP and NADPH.
Does photosystem 1 or 2 come first?
Photosystem I vs. There are two types of photosystems in the light-dependent reactions, photosystem II (PSII) and photosystem I (PSI). PSII comes first in the path of electron flow, but it is named as second because it was discovered after PSI.
What is the difference between ps1 and ps2?
Photosystem I (PS I) and photosystem II (PS II) are two multi-subunit membrane-protein complexes involved in oxygenic photosynthesis. The main difference between photosystem 1 and 2 is that PS I absorbs longer wavelengths of light (>680 nm) whereas PS II absorbs shorter wavelengths of light (<680 nm).
Why are the photosystem named I and II?
Physically, photosystems are found in the thylakoid membranes. There are two kinds of photosystems: photosystem I (PSI) and photosystem II (PSII) (Fig. PSII acts first during the light transformation process in photosynthesis, but it was named PSII because it was discovered second.
What does photosystem 1 depend on?
Photosystem I is an integral membrane protein complex that uses light energy to catalyze the transfer of electrons across the thylakoid membrane from plastocyanin to ferredoxin. Ultimately, the electrons that are transferred by Photosystem I are used to produce the high energy carrier NADPH.
What is the end product of photosystem I?
ATP
Does the Calvin cycle depend on any other step?
The Calvin cycle refers to the light-independent reactions in photosynthesis that take place in three key steps. Although the Calvin Cycle is not directly dependent on light, it is indirectly dependent on light since the necessary energy carriers (ATP and NADPH) are products of light-dependent reactions.
What are the 7 steps of light-dependent reactions?
Terms in this set (7)
- (1st Time) Energy is absorbed from the sun.
- Water is broken down.
- Hydrogen ions are transported across the thylakoid membrane.
- (2nd Time) Energy is absorbed from the sun.
- NADPH is produced from NADP+.
- Hydrogen ions diffuse through the protein channel.
- ADP becomes ATP.
What is the first step in the light dependent reactions?
The overall function of light-dependent reactions, the first stage of photosynthesis, is to convert solar energy into chemical energy in the form of NADPH and ATP, which are used in light-independent reactions and fuel the assembly of sugar molecules.
What is the first step of light reactions?
The initial stage is called the light reactions as they occur only in the presence of light. During these initial reactions, water is used and oxygen is released. The energy from sunlight is converted into a small amount of ATP and an energy carrier called NADPH.
What are the three main steps of the light reactions?
These energy-carrying molecules are made in the stroma where carbon fixation takes place. The light-independent reactions of the Calvin cycle can be organized into three basic stages: fixation, reduction, and regeneration.
What are the three parts of the light-dependent reactions?
4 Cards in this Set
| What are the three parts of the light-dependent reactions? | Photosystem 2, Photosystem 1, and ATP Synthase |
|---|---|
| What are the functions of photosynthesis 1? | to absorb and transfer energy when it goes into the electron transport chain. also to break down water as it goes across the thylakoid membrane. |
What is the other name for light reaction?
The other name of light reaction is photo reaction.
What are the events of light reaction?
The important events of light reaction are (i) Excitation of chlorophyll molecule to emit a pair of electrons and use of their energy in the formation of ATP from ADP + Pi. This process is called photophosphorylation. Splitting of water molecule (a) (b) End products of light reaction are NADPH and ATP.
Where do light reactions occur?
thylakoid discs
What is the difference between NADP+ and Nadph?
NADPH is the reduced form of NADP+, meaning that the latter features an extra hydrogen ion in its chemical structure. In order for NADP+ to transform into NADPH, the former requires two electrons and two hydrogen ions. NADPH acts as a reducing agent during the synthesis of nucleic acids and lipids.