AP Bio 3.4 Cellular Energetics Photosynthesis
37 flashcards covering AP Bio 3.4 Cellular Energetics Photosynthesis for the AP-BIOLOGY Unit 3 section.
Cellular energetics, specifically photosynthesis, is a key concept in AP Biology as outlined by the College Board's AP Biology Curriculum Framework. This topic encompasses the biochemical processes by which plants, algae, and some bacteria convert light energy into chemical energy, primarily in the form of glucose. Understanding the light-dependent and light-independent reactions, as well as the overall significance of photosynthesis in ecosystems, is crucial for mastering this unit.
On practice exams and competency assessments, questions about photosynthesis often require students to analyze diagrams, interpret data, or apply concepts to novel scenarios. Common traps include confusing the roles of chlorophyll and other pigments, misidentifying the inputs and outputs of the photosynthetic process, or overlooking the impact of environmental factors such as light intensity and carbon dioxide concentration.
One important real-world tip is to remember that while photosynthesis is vital for energy production in plants, it also plays a critical role in the global carbon cycle, which is often underestimated in discussions about climate change.
Terms (37)
- 01
What is the primary function of photosynthesis in plants?
The primary function of photosynthesis in plants is to convert light energy into chemical energy stored in glucose, which serves as food for the plant and as energy for other organisms in the ecosystem (College Board AP CED).
- 02
What are the main products of photosynthesis?
The main products of photosynthesis are glucose and oxygen, produced from carbon dioxide and water in the presence of light (College Board AP CED).
- 03
Which organelle is responsible for photosynthesis?
Chloroplasts are the organelles responsible for photosynthesis in plant cells, containing chlorophyll that captures light energy (College Board AP CED).
- 04
What is the role of chlorophyll in photosynthesis?
Chlorophyll absorbs light energy, primarily in the blue and red wavelengths, which is essential for driving the reactions of photosynthesis (College Board AP CED).
- 05
What are the two main stages of photosynthesis?
The two main stages of photosynthesis are the light-dependent reactions and the light-independent reactions (Calvin cycle) (College Board AP CED).
- 06
How does light intensity affect the rate of photosynthesis?
As light intensity increases, the rate of photosynthesis increases until it reaches a saturation point, beyond which it levels off (College Board AP CED).
- 07
What is the significance of the Calvin cycle?
The Calvin cycle is significant because it synthesizes glucose from carbon dioxide using ATP and NADPH produced in the light-dependent reactions (College Board AP CED).
- 08
What is the equation for photosynthesis?
The equation for photosynthesis is 6CO2 + 6H2O + light energy → C6H12O6 + 6O2, representing the transformation of carbon dioxide and water into glucose and oxygen (College Board AP CED).
- 09
What factors can limit the rate of photosynthesis?
Factors that can limit the rate of photosynthesis include light intensity, carbon dioxide concentration, and temperature (College Board AP CED).
- 10
How often do chloroplasts regenerate their chlorophyll?
Chloroplasts continuously regenerate chlorophyll as it degrades due to exposure to light; however, specific regeneration rates are not defined in the CED (College Board AP CED).
- 11
What is the role of water in photosynthesis?
Water serves as a reactant in photosynthesis, providing electrons and protons for the formation of glucose and releasing oxygen as a byproduct (College Board AP CED).
- 12
What happens during the light-dependent reactions?
During the light-dependent reactions, light energy is converted into chemical energy in the form of ATP and NADPH, and oxygen is released as a byproduct (College Board AP CED).
- 13
Which pigment absorbs the most light for photosynthesis?
Chlorophyll a is the pigment that absorbs the most light for photosynthesis, particularly in the blue and red wavelengths (College Board AP CED).
- 14
What is photolysis in the context of photosynthesis?
Photolysis is the process by which water molecules are split into oxygen, protons, and electrons using light energy during the light-dependent reactions (College Board AP CED).
- 15
What is the main purpose of the light-dependent reactions?
The main purpose of the light-dependent reactions is to convert solar energy into chemical energy in the form of ATP and NADPH (College Board AP CED).
- 16
How do temperature changes affect photosynthesis?
Temperature changes can affect the enzymes involved in photosynthesis; optimal temperatures enhance the rate, while extreme temperatures can inhibit it (College Board AP CED).
- 17
What is the relationship between photosynthesis and cellular respiration?
Photosynthesis and cellular respiration are interconnected processes; photosynthesis produces glucose and oxygen, which are used in cellular respiration to generate ATP (College Board AP CED).
- 18
What is the role of NADP+ in photosynthesis?
NADP+ acts as an electron carrier in photosynthesis, becoming reduced to NADPH during the light-dependent reactions (College Board AP CED).
- 19
What is the significance of the stomata in photosynthesis?
Stomata are significant as they regulate gas exchange, allowing carbon dioxide to enter the leaf and oxygen to exit, which is crucial for photosynthesis (College Board AP CED).
- 20
What is the effect of carbon dioxide concentration on photosynthesis?
Increasing carbon dioxide concentration generally enhances the rate of photosynthesis until other factors become limiting (College Board AP CED).
- 21
How does temperature affect enzyme activity in photosynthesis?
Temperature affects enzyme activity in photosynthesis; as temperature rises, enzyme activity increases to a point, after which it may denature and decrease (College Board AP CED).
- 22
What is the purpose of the light-independent reactions?
The purpose of the light-independent reactions (Calvin cycle) is to utilize ATP and NADPH from the light-dependent reactions to convert carbon dioxide into glucose (College Board AP CED).
- 23
What role do accessory pigments play in photosynthesis?
Accessory pigments, such as carotenoids, broaden the spectrum of light absorbed for photosynthesis and protect chlorophyll from damage (College Board AP CED).
- 24
What is the relationship between photosynthesis and the carbon cycle?
Photosynthesis plays a crucial role in the carbon cycle by converting atmospheric carbon dioxide into organic compounds, thus reducing greenhouse gases (College Board AP CED).
- 25
What adaptations do plants have for photosynthesis in low light conditions?
Plants in low light conditions may have larger leaves and more chlorophyll to maximize light capture for photosynthesis (College Board AP CED).
- 26
What is the role of RuBisCO in the Calvin cycle?
RuBisCO is an enzyme that catalyzes the first step of the Calvin cycle, fixing carbon dioxide into an organic molecule (College Board AP CED).
- 27
How do C4 and CAM plants differ in their photosynthetic processes?
C4 plants fix carbon dioxide into a four-carbon compound before the Calvin cycle, while CAM plants fix carbon dioxide at night to reduce water loss (College Board AP CED).
- 28
What is the significance of the electron transport chain in photosynthesis?
The electron transport chain in photosynthesis is significant for transferring electrons from water to NADP+, generating ATP and NADPH (College Board AP CED).
- 29
What is the function of ATP synthase in photosynthesis?
ATP synthase functions to produce ATP from ADP and inorganic phosphate during the light-dependent reactions of photosynthesis (College Board AP CED).
- 30
What is photophosphorylation?
Photophosphorylation is the process of generating ATP from ADP and inorganic phosphate using light energy during the light-dependent reactions (College Board AP CED).
- 31
How does the structure of chloroplasts facilitate photosynthesis?
The structure of chloroplasts, including thylakoids and stroma, facilitates photosynthesis by providing a site for light absorption and the Calvin cycle (College Board AP CED).
- 32
What is the role of light in the process of photosynthesis?
Light provides the energy necessary for the photochemical reactions in photosynthesis, driving the conversion of water and carbon dioxide into glucose (College Board AP CED).
- 33
How do plants adapt to high light intensity during photosynthesis?
Plants adapt to high light intensity by adjusting leaf orientation, increasing chlorophyll production, and using protective pigments (College Board AP CED).
- 34
What is the impact of increased atmospheric CO2 on photosynthesis?
Increased atmospheric CO2 can enhance the rate of photosynthesis in many plants, leading to greater biomass production (College Board AP CED).
- 35
What is the role of the thylakoid membrane in photosynthesis?
The thylakoid membrane houses the components for the light-dependent reactions, including chlorophyll and the electron transport chain (College Board AP CED).
- 36
What are the byproducts of the light-dependent reactions?
The byproducts of the light-dependent reactions are oxygen, produced from water, and ATP and NADPH, which are used in the Calvin cycle (College Board AP CED).
- 37
How does the structure of a leaf facilitate photosynthesis?
The structure of a leaf, including its large surface area and presence of chloroplasts, maximizes light absorption and gas exchange for photosynthesis (College Board AP CED).