Bio 101 Photosynthesis Calvin Cycle
32 flashcards covering Bio 101 Photosynthesis Calvin Cycle for the BIOLOGY-101 Energy & Metabolism section.
The Calvin Cycle is a fundamental process in photosynthesis, specifically responsible for converting carbon dioxide into glucose using ATP and NADPH produced in the light-dependent reactions. This concept is defined in the curriculum for Introductory Biology I courses, aligning with guidelines from the College Board's AP Biology framework. Understanding the Calvin Cycle is essential for grasping how energy flows in ecosystems and the role of plants in carbon fixation.
In practice exams or competency assessments, questions about the Calvin Cycle often focus on its stages, the enzymes involved, and the overall significance of the process in energy metabolism. Common question styles include multiple-choice and short-answer formats that may ask for the sequence of reactions or the identification of specific molecules. A frequent pitfall is confusing the Calvin Cycle with the light-dependent reactions, leading to errors in understanding their interdependence.
One concrete tip to remember is to focus on the role of ribulose bisphosphate (RuBP) and the enzyme RuBisCO, as these are often key points in exam questions.
Terms (32)
- 01
What is the primary function of the Calvin cycle?
The primary function of the Calvin cycle is to convert carbon dioxide and other compounds into glucose, utilizing ATP and NADPH produced in the light-dependent reactions of photosynthesis (Campbell Biology, chapter on photosynthesis).
- 02
What are the three main phases of the Calvin cycle?
The three main phases of the Calvin cycle are carbon fixation, reduction, and regeneration of ribulose bisphosphate (RuBP) (Campbell Biology, chapter on photosynthesis).
- 03
What enzyme catalyzes the first step of the Calvin cycle?
The enzyme that catalyzes the first step of the Calvin cycle is ribulose bisphosphate carboxylase/oxygenase (RuBisCO), which facilitates the fixation of carbon dioxide to ribulose bisphosphate (RuBP) (Campbell Biology, chapter on photosynthesis).
- 04
How many molecules of CO2 are fixed in one turn of the Calvin cycle?
One molecule of CO2 is fixed in one turn of the Calvin cycle, leading to the eventual production of glucose after multiple turns (Campbell Biology, chapter on photosynthesis).
- 05
What is produced during the reduction phase of the Calvin cycle?
During the reduction phase of the Calvin cycle, three-carbon sugars (G3P) are produced, which can be used to form glucose and other carbohydrates (Campbell Biology, chapter on photosynthesis).
- 06
What happens during the regeneration phase of the Calvin cycle?
During the regeneration phase of the Calvin cycle, ribulose bisphosphate (RuBP) is regenerated from G3P, allowing the cycle to continue (Campbell Biology, chapter on photosynthesis).
- 07
In which part of the chloroplast does the Calvin cycle occur?
The Calvin cycle occurs in the stroma of the chloroplast, where it utilizes the products of the light-dependent reactions (Campbell Biology, chapter on photosynthesis).
- 08
What role do ATP and NADPH play in the Calvin cycle?
ATP provides the energy, while NADPH provides the reducing power needed for the conversion of 3-phosphoglycerate to glyceraldehyde-3-phosphate (G3P) during the Calvin cycle (Campbell Biology, chapter on photosynthesis).
- 09
What is the significance of G3P in the Calvin cycle?
G3P (glyceraldehyde-3-phosphate) is a key product of the Calvin cycle that can be used to form glucose and other carbohydrates, serving as a building block for energy storage (Campbell Biology, chapter on photosynthesis).
- 10
How many times must the Calvin cycle turn to produce one glucose molecule?
The Calvin cycle must turn six times to produce one molecule of glucose, as each turn fixes one carbon atom (Campbell Biology, chapter on photosynthesis).
- 11
What is the initial substrate for carbon fixation in the Calvin cycle?
The initial substrate for carbon fixation in the Calvin cycle is ribulose bisphosphate (RuBP), which combines with carbon dioxide (Campbell Biology, chapter on photosynthesis).
- 12
What is the end product of the Calvin cycle that can be used to form glucose?
The end product of the Calvin cycle that can be used to form glucose is glyceraldehyde-3-phosphate (G3P) (Campbell Biology, chapter on photosynthesis).
- 13
What is the importance of the Calvin cycle in photosynthesis?
The Calvin cycle is crucial for photosynthesis as it enables the conversion of inorganic carbon dioxide into organic compounds, which are essential for plant growth and energy storage (Campbell Biology, chapter on photosynthesis).
- 14
What is the role of RuBisCO in the Calvin cycle?
RuBisCO plays a critical role in the Calvin cycle by catalyzing the reaction that fixes carbon dioxide to ribulose bisphosphate (RuBP), initiating the cycle (Campbell Biology, chapter on photosynthesis).
- 15
How does the Calvin cycle contribute to the overall process of photosynthesis?
The Calvin cycle contributes to photosynthesis by utilizing ATP and NADPH from the light-dependent reactions to convert carbon dioxide into glucose, thus storing energy in a usable form (Campbell Biology, chapter on photosynthesis).
- 16
What are the products of the Calvin cycle that are used in the light-dependent reactions?
The products of the Calvin cycle that are used in the light-dependent reactions are ADP and NADP+, which are regenerated during the Calvin cycle (Campbell Biology, chapter on photosynthesis).
- 17
What is the significance of the regeneration of RuBP in the Calvin cycle?
The regeneration of RuBP is significant because it allows the Calvin cycle to continue, enabling the fixation of additional carbon dioxide and the production of more carbohydrates (Campbell Biology, chapter on photosynthesis).
- 18
What factors can affect the rate of the Calvin cycle?
The rate of the Calvin cycle can be affected by factors such as light intensity, temperature, and the concentration of carbon dioxide (Campbell Biology, chapter on photosynthesis).
- 19
What is the relationship between the Calvin cycle and the light-dependent reactions?
The Calvin cycle is dependent on the light-dependent reactions for ATP and NADPH, which provide the energy and reducing power necessary for carbon fixation (Campbell Biology, chapter on photosynthesis).
- 20
How does temperature influence the Calvin cycle?
Temperature influences the Calvin cycle by affecting enzyme activity, particularly RuBisCO, which can optimize or inhibit the cycle's efficiency depending on the temperature range (Campbell Biology, chapter on photosynthesis).
- 21
What is the role of chlorophyll in photosynthesis related to the Calvin cycle?
Chlorophyll is essential for photosynthesis as it captures light energy, which is then converted into chemical energy used in the Calvin cycle to synthesize glucose (Campbell Biology, chapter on photosynthesis).
- 22
What is the importance of carbon fixation in the Calvin cycle?
Carbon fixation is important in the Calvin cycle as it is the process by which inorganic carbon dioxide is converted into organic molecules, forming the basis of the plant's energy supply (Campbell Biology, chapter on photosynthesis).
- 23
What happens to the G3P produced in the Calvin cycle?
The G3P produced in the Calvin cycle can be used to synthesize glucose and other carbohydrates or can be converted into starch for energy storage (Campbell Biology, chapter on photosynthesis).
- 24
What is the role of NADPH in the Calvin cycle?
NADPH serves as a reducing agent in the Calvin cycle, providing the electrons needed to convert 3-phosphoglycerate into G3P (Campbell Biology, chapter on photosynthesis).
- 25
How does the Calvin cycle contribute to the carbon cycle?
The Calvin cycle contributes to the carbon cycle by fixing atmospheric carbon dioxide into organic compounds, which are then used by living organisms for energy (Campbell Biology, chapter on photosynthesis).
- 26
What is the fate of the ATP used in the Calvin cycle?
The ATP used in the Calvin cycle is converted to ADP and inorganic phosphate after providing energy for the conversion of 3-phosphoglycerate to G3P (Campbell Biology, chapter on photosynthesis).
- 27
What is the significance of the enzyme activity of RuBisCO?
The enzyme activity of RuBisCO is significant because it determines the efficiency of carbon fixation in the Calvin cycle, impacting the overall rate of photosynthesis (Campbell Biology, chapter on photosynthesis).
- 28
How do plants adapt their Calvin cycle to different environmental conditions?
Plants can adapt their Calvin cycle to different environmental conditions by altering the expression of RuBisCO and other enzymes, as well as adjusting the stomatal openings to optimize CO2 uptake (Campbell Biology, chapter on photosynthesis).
- 29
What is the role of light in the Calvin cycle?
While the Calvin cycle does not directly require light, it relies on the ATP and NADPH produced during the light-dependent reactions, which are driven by light (Campbell Biology, chapter on photosynthesis).
- 30
How does the Calvin cycle relate to the production of oxygen in photosynthesis?
The Calvin cycle itself does not produce oxygen; instead, oxygen is released during the light-dependent reactions of photosynthesis, while the Calvin cycle focuses on carbon fixation (Campbell Biology, chapter on photosynthesis).
- 31
What is the relationship between G3P and glucose synthesis?
G3P is a precursor for glucose synthesis, as two G3P molecules can combine to form one glucose molecule, linking the Calvin cycle to carbohydrate production (Campbell Biology, chapter on photosynthesis).
- 32
What is the role of inorganic phosphate in the Calvin cycle?
Inorganic phosphate is used in the Calvin cycle to regenerate ribulose bisphosphate (RuBP) from G3P, facilitating the continuation of the cycle (Campbell Biology, chapter on photosynthesis).