5.f - unit c photosynthesis and cellular respiration formative
the image below shows a summary of photosynthesis. the red outlined boxes show products or reactants of photosynthesis. the black outlined boxes show structures in the chloroplast. drag the correct label into each drop zone.
light-dependent reactions the calvin cycle
light
electrons are one-carbon m
reduced carbo
outer
membrane
inner
membrane
final electron acceptor reactants that act as electron acceptors products that have reducing power

Question

Accepted Answer

To solve this photosynthesis - related labeling problem, we analyze the components of light - dependent reactions and the Calvin cycle:

### Step 1: Analyze the light - dependent reactions
- In the light - dependent reactions, water ($H_2O$) is split. The electrons from water need an acceptor. The "reactants that act as electron acceptors" label should be associated with the molecule that accepts electrons from the split water. In the light - dependent reactions, $NADP^+$ (nicotinamide adenine dinucleotide phosphate) acts as an electron acceptor. But in the context of the reactants for the light - dependent reactions, water is split and the electrons are passed along, with the initial electron acceptors being part of the photosystem. However, looking at the labels, the "reactants that act as electron acceptors" should be placed where the reactant (like $NADP^+$ or another electron - accepting reactant) is involved in the light - dependent reactions. The area near the thylakoid (the green stacks, which are thylakoids) where the electron flow starts from the split water, the "reactants that act as electron acceptors" label fits the region where the electron - accepting reactant is utilized.
- The "final electron acceptor" in the light - dependent reactions is $NADP^+$, which is reduced to $NADPH$. $NADPH$ has reducing power, so the "products that have reducing power" label is for $NADPH$. The "final electron acceptor" label is for the molecule that finally accepts the electrons, which is $NADP^+$, and then the product $NADPH$ (with reducing power) is formed.

### Step 2: Analyze the Calvin cycle
- In the Calvin cycle, carbon dioxide ($CO_2$) is fixed. The "one - carbon molecule" is likely $CO_2$ (since it has one carbon atom in the context of carbon fixation). The Calvin cycle uses the products of the light - dependent reactions (ATP and $NADPH$) to fix carbon. The "reduced carbon" is the end product of the Calvin cycle, like glyceraldehyde - 3 - phosphate (G3P) or glucose - related molecules. The "reactants that act as electron acceptors" in the Calvin cycle would be the molecules that accept electrons during the reduction of carbon, but more accurately, the light - dependent reactions produce $NADPH$ (with reducing power) which is used in the Calvin cycle.

### Label Placement (Summary of correct placements)
- For the light - dependent reactions (left side, near the thylakoid and the electron flow):
    - The "reactants that act as electron acceptors" label goes to the region where the electron - accepting reactant (e.g., $NADP^+$ as a reactant in the light - dependent reactions to accept electrons and become $NADPH$) is involved.
    - The "final electron acceptor" label is for the molecule that finally accepts the electrons, which is $NADP^+$, and the product $NADPH$ (with reducing power) is formed, so the "products that have reducing power" label is for the $NADPH$ - producing region.
- For the Calvin cycle (right side):
    - The "one - carbon molecule" is $CO_2$, which is a reactant in the Calvin cycle. The "reduced carbon" is the product of the Calvin cycle (like G3P). The "products that have reducing power" (from the light - dependent reactions, $NADPH$) is used in the Calvin cycle to reduce carbon, so the $NADPH$ (product with reducing power) is used in the Calvin cycle, but the label "products that have reducing power" should be placed where the product from the light - dependent reactions (with reducing power) is input into the Calvin cycle.

Since this is a drag - and - drop problem, the correct placements (in general terms, depending on the exact diagram layout) are:

- In the light - dependent reactions (near the thylakoid and electron flow):
    - "reactants that act as electron acceptors" - near the start of electron flow from split water (thylakoid region).
    - "final electron acceptor" - near the region where $NADP^+$ is reduced.
    - "products that have reducing power" - near the output of $NADPH$ from the light - dependent reactions.
- In the Calvin cycle:
    - "one - carbon molecule" - near the $CO_2$ input (the region with "one - carbon m" label).
    - "reduced carbon" - near the end product of carbon fixation.

If we assume the labels are:
- "reactants that act as electron acceptors" - placed at the reactant - side of the light - dependent reactions (near the thylakoid, where the electron - accepting reactant is used).
- "final electron acceptor" - placed at the region where the final electron acceptance occurs (leading to $NADPH$ production).
- "products that have reducing power" - placed at the output of $NADPH$ (which goes to the Calvin cycle).
- "one - carbon molecule" - placed at the $CO_2$ input in the Calvin cycle.
- "reduced carbon" - placed at the end product of the Calvin cycle.

(Note: Since the exact diagram's drop zones are not fully clear from the text - based description, but based on photosynthesis knowledge:
- The "reactants that act as electron acceptors" label is for the electron - accepting reactant in light - dependent reactions (e.g., $NADP^+$ as a reactant).
- The "final electron acceptor" is $NADP^+$, which is reduced to $NADPH$ (products with reducing power).
- In the Calvin cycle, the "one - carbon molecule" is $CO_2$, "reduced carbon" is the fixed carbon product, and the "products that have reducing power" ($NADPH$) is used in the Calvin cycle.)

If we have to give the answer in terms of the labels and their correct associations:

- "reactants that act as electron acceptors" - associated with the light - dependent reactions' electron - accepting reactant (e.g., $NADP^+$ as a reactant).
- "final electron acceptor" - $NADP^+$ (in light - dependent reactions, leading to $NADPH$ production).
- "products that have reducing power" - $NADPH$ (product of light - dependent reactions, used in Calvin cycle).
- "one - carbon molecule" - $CO_2$ (in Calvin cycle).
- "reduced carbon" - product of Calvin cycle (e.g., G3P).

For the purpose of the answer (assuming the drop zones are labeled as per the standard photosynthesis diagram):

# Answer:
- Light - dependent reactions (near thylakoid, electron flow start): reactants that act as electron acceptors
- Light - dependent reactions (near $NADPH$ production): final electron acceptor
- Light - dependent reactions (output to Calvin cycle): products that have reducing power
- Calvin cycle (carbon input): one - carbon molecule (e.g., $CO_2$)
- Calvin cycle (carbon output): reduced carbon

(The exact placement depends on the diagram's drop zones, but the above is the correct association of labels with the components of photosynthesis.)

Sovi.AI - AI Math Tutor

QUESTION IMAGE

Question

Explanation:

Step 1: Analyze the light - dependent reactions

Step 2: Analyze the Calvin cycle

Label Placement (Summary of correct placements)

Answer: