5.1.3 Photosynthesis: The Final Picture Flashcards
1
Q
Robin Hill
A
- In the 1930s, Robin Hill found that two separate types of reactions took place within chloroplasts. One type of reaction split water to release oxygen gas (O2) and required light. The other reaction was light independent and fixed hydrogen to carbon dioxide (CO2) to make glucose
- placed chloroplasts in an environment that was
CO2-deprived and added an oxidizing agent. He found that the chloroplasts were able to produce O2 from water (H2O). - Hill’s findings led to the idea that there were two separate reactions taking place in photosynthesis.
· The light-dependent reactions involved photolysis, or the splitting of water by light to produce O2
· The light-independent reactions involved fixing CO2
to hydrogen to produce glucose.
2
Q
NADP+
A
- an oxidizing agent (an electron acceptor) used in photosynthesis.
3
Q
Arnon
A
- In 1954, based on Hill’s work, Arnon found that chloroplasts deprived of CO2 could make ATP, O2,
NADPH + H+, and O2 (but no glucose) in the presence of light. - In 1951, the coenzyme NADP was found to be the electron acceptor involved in Hill’s experiment. Three years later, building on Hill’s work, Arnon found that
chloroplasts produced ATP, NADPH + H+, and O2 without carbon dioxide.
4
Q
True or false?
NADP is an electron donor during photosynthesis.
A
- false
5
Q
During the general process of photosynthesis, the energy from light is used to accomplish which process?
A
- the oxidation of water
6
Q
In the light-dependent reactions __________ takes place, while in the light-independent reactions __________ takes place.
A
- the splitting of water; carbon fixation
7
Q
During photosynthesis __________ is oxidized and __________ is reduced.
A
- water; carbon dioxide
8
Q
Regarding the light-dependent reactions, which statement is correct?
A
- The light-dependent reactions take in water and release oxygen to produce ATP and NADPH
9
Q
In photolysis, energy from light is used to split
A
- water
