Question

ch. 9/10 photosynthesis & cellular respiration:

1. label the \building blocks\ of adp & atp. using your cloze notes, identify which picture represents adp & atp. compare/contrast regarding adp & atp (energy)

adp
atp

Explanation:

To solve this, we analyze ADP and ATP:

ADP (Adenosine Diphosphate)

• Structure: Adenosine + 2 phosphate groups ($\text{ADP} = \text{Adenosine} - \text{P} - \text{P}$).
• Energy Role: Low - energy state. It is formed when ATP loses one phosphate group (during energy release for cellular processes).

ATP (Adenosine Triphosphate)

• Structure: Adenosine + 3 phosphate groups ($\text{ATP} = \text{Adenosine} - \text{P} - \text{P} - \text{P}$).
• Energy Role: High - energy state. It stores energy in the bond between the second and third phosphate groups. When this bond is broken (releasing a phosphate to become ADP), energy is released for cellular work (like active transport, muscle contraction, etc.).

Compare/Contrast

• Similarities: Both are nucleotides involved in cellular energy transfer. Both contain adenosine and phosphate groups.
• Differences: ATP has one more phosphate group than ADP. ATP is the energy - carrying molecule (energy - rich), while ADP is the low - energy form that can be recharged to ATP (by adding a phosphate group, usually in processes like cellular respiration or photosynthesis).

For the "building blocks" (components):

• ADP: Adenine (a nitrogen - containing base), ribose (a sugar), and 2 phosphate groups.
• ATP: Adenine, ribose, and 3 phosphate groups.

To identify which picture is ADP or ATP: Look at the number of phosphate groups. The one with 2 phosphate groups is ADP, and the one with 3 is ATP.

Answer:

ADP:

• Building Blocks (Components): Adenine, ribose, 2 phosphate groups.
• Energy Role: Low - energy, formed from ATP after energy release.

ATP:

• Building Blocks (Components): Adenine, ribose, 3 phosphate groups.
• Energy Role: High - energy, stores energy for cellular work.

Compare/Contrast:

• Similarities: Both have adenosine (adenine + ribose) and phosphate groups; involved in energy transfer.
• Differences: ATP has 3 phosphates (energy - rich), ADP has 2 (energy - poor); ATP → ADP releases energy, ADP → ATP stores energy.

Picture Identification:

• The molecule with 2 phosphate groups is ADP.
• The molecule with 3 phosphate groups is ATP.