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Photosynthesis Concepts
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Photosynthesis Concepts
Photosynthesis Concepts
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1
Question
What is photosynthesis?
Answer
Photosynthesis is the action of transforming sunlight energy into chemical energy in the form of carbon compounds.
2
Question
What are the main groups of carbon compounds produced during photosynthesis?
Answer
The main groups of carbon compounds produced are carbohydrates, proteins, lipids, and nucleic acids.
3
Question
What is the general equation for photosynthesis?
Answer
6CO2 + 12H2O + light energy → C6H12O6 + 6O2 + 6H2O.
4
Question
Where do photosynthesis processes occur in plants?
Answer
Photosynthesis occurs in membrane-bound organelles called chloroplasts.
5
Question
What pigment is responsible for photosynthesis in chloroplasts?
Answer
Chlorophyll is the pigment responsible for photosynthesis in chloroplasts.
6
Question
What is the role of sunlight in photosynthesis?
Answer
Sunlight provides the energy needed to drive the synthesis of organic molecules from carbon dioxide and water.
7
Question
Which organisms are capable of photosynthesis?
Answer
Photosynthesis occurs in plants, algae, certain protists, and some prokaryotes.
8
Question
What are accessory pigments and what is their role?
Answer
Accessory pigments capture light outside the wavelengths captured by chlorophyll, thus broadening the spectrum that can effectively drive photosynthesis.
9
Question
What is the absorption spectrum of a pigment?
Answer
The absorption spectrum is the light absorption vs the wavelength for that pigment.
10
Question
What types of light do chlorophylls absorb?
Answer
Chlorophylls absorb red and blue-violet light.
11
Question
What are the two main categories of photosynthetic pigments?
Answer
Chlorophylls and carotenoids.
12
Question
What is the difference between chlorophyll a and chlorophyll b?
Answer
Chlorophyll a can participate directly in the light reactions of photosynthesis, while chlorophyll b and carotenoids can absorb wavelengths of light that chlorophyll a cannot.
13
Question
What is the light dependent phase of photosynthesis?
Answer
The light dependent phase (LD) occurs in the thylakoid membranes of chloroplasts and involves capturing light energy.
14
Question
What is the light independent phase of photosynthesis?
Answer
The light independent phase (LI), also known as the Calvin cycle, occurs in the stroma of chloroplasts and does not require light directly.
15
Question
What are the inputs of the Calvin cycle?
Answer
The inputs include CO2, ATP, and NADPH.
16
Question
What is the main enzyme involved in the Calvin cycle?
Answer
The main enzyme involved is RuBisCo (ribulose bisphosphate carboxylase).
17
Question
What are the three main phases of the Calvin cycle?
Answer
The three main phases are carbon fixation, reduction, and regeneration of the CO2 acceptor.
18
Question
What by-products are produced during photosynthesis?
Answer
The by-products produced are sugars, oxygen, and water.
19
Question
What is the role of NADPH in photosynthesis?
Answer
NADPH provides reducing power for making glucose in the Calvin cycle.
20
Question
What happens during photolysis of water?
Answer
In photolysis of water, water molecules are split into hydrogen ions and oxygen, replenishing electrons in photosystem II.
21
Question
What are the two types of phosphorylation in photosynthesis?
Answer
Non-cyclic phosphorylation and cyclic phosphorylation.
22
Question
What is the function of ATP synthase in photosynthesis?
Answer
ATP synthase catalyzes the production of ATP from ADP and inorganic phosphate using the energy from hydrogen ion flow.
23
Question
What factors affect the photosynthetic rate?
Answer
The photosynthetic rate is affected by the amount of light available, the level of carbon dioxide (CO2), temperature, and any other factors that affect enzymes.
24
Question
What is an action spectrum in photosynthesis?
Answer
An action spectrum profiles the effectiveness of different wavelength light in fueling photosynthesis.
25
Question
What is the function of thylakoids?
Answer
Thylakoids are flattened sacs within chloroplasts where the light-dependent reactions of photosynthesis take place.
26
Question
What is the stroma in chloroplasts?
Answer
The stroma is the fluid outside the thylakoids where the light-independent reactions (Calvin cycle) occur.
27
Question
What is the significance of the electromagnetic spectrum in photosynthesis?
Answer
The segment of the electromagnetic spectrum most important to life is the narrow band between about 380 and 750 nanometers (nm), known as visible light.
28
Question
How does the structure of a chloroplast facilitate photosynthesis?
Answer
The two membranes and internal compartmentalization into thylakoids and stroma allow for efficient separation of reactions and creation of concentration gradients necessary for ATP production.
29
Question
What is chemiosmosis in the context of photosynthesis?
Answer
Chemiosmosis refers to the process where the flow of hydrogen ions back across the membrane is coupled to ATP synthesis.
30
Question
What is the role of the electron transport chain in photosynthesis?
Answer
The electron transport chain facilitates the transfer of electrons, releasing energy used to pump hydrogen ions and generate ATP.