Question

1. what is energy? 2. describe the structure of an atp molecule. 3. explain what is happening at “a” & “b” in the image above. adp & pi atp a b 4. list the location of the light - dependent and light - independent reactions.

Explanation:

1. Energy is the capacity to do work. It exists in various forms like kinetic (motion - related), potential (stored), chemical (in bonds), etc.
2. ATP (adenosine tri - phosphate) consists of an adenine base, a ribose sugar, and three phosphate groups. The high - energy bonds between the phosphate groups are crucial for energy transfer.
3. At "A", energy is used to combine ADP (adenosine diphosphate) and a phosphate group (P$_i$) to form ATP. At "B", ATP is broken down into ADP and P$_i$, releasing energy.
4. Light - dependent reactions occur in the thylakoid membranes of chloroplasts. Light - independent reactions (Calvin cycle) occur in the stroma of chloroplasts.

Answer:

1. The capacity to do work, existing in multiple forms.
2. Adenine base, ribose sugar, and three phosphate groups.
3. A: Energy used to form ATP from ADP and P$_i$. B: ATP broken down to ADP and P$_i$ releasing energy.
4. Light - dependent: Thylakoid membranes. Light - independent: Stroma of chloroplasts.