Biology by Bradford
3.3.A, 3.3.BATP
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3.3 Cellular Energy: revision map
The subtopic in the middle and four tasks round it: label a diagram, complete a table, put a process in order and fill 8 gaps. Every box rests on a learning objective of the topic in the AP Biology course and exam description. Type into the blanks and check them, or print it on A4, Letter or A3 with an answer key.
Cellular Energy
AP Biology · Unit 3 Cellular EnergeticsHover over a box to see it. Untick it to leave it off this sheet and its printout.
Name3.3.AReleasing and using energy
| Exergonic | Endergonic | |
|---|---|---|
| Free energy of products | than reactants | than reactants |
| ΔG | negative | positive |
| Occurs | spontaneously, releasing energy | only when energy is supplied |
| Example | hydrolysis of ATP | building a polymer |
Topic 3.3Cellular Energy
3.3.BThe ATP cycle
Number the steps in order.
- ADP and phosphate are free to be recycled.
- A cell reaction releases energy, such as the breakdown of glucose.
- The energy is used to attach a phosphate group to ADP.
- ATP is hydrolyzed and energy is released to drive an endergonic reaction.
- ATP carries the energy to where it is needed.
3.3.A, 3.3.BEnergy and life
Living systems are highly organized, which takes a constant input of energy. In each energy transfer some is lost as , so cells and ecosystems cannot run on the same energy again and again. ATP is the cell's energy currency: its hydrolysis to ADP and phosphate is exergonic, and cells it to endergonic reactions such as active transport and biosynthesis, so that the combined process has a negative free energy change.
Word bank adeninecoupleheathigh-energy bondhigherlowerphosphate groupribose
Answer key
Every box on the sheet with its gaps filled in, as the subtopic reads in full.
LabelATP
- adenine
- ribose
- phosphate group
- high-energy bond
TableReleasing and using energy
Exergonic Endergonic Free energy of products lower than reactants higher than reactants ΔG negative positive Occurs spontaneously, releasing energy only when energy is supplied Example hydrolysis of ATP building a polymer OrderThe ATP cycle
- A cell reaction releases energy, such as the breakdown of glucose.
- The energy is used to attach a phosphate group to ADP.
- ATP carries the energy to where it is needed.
- ATP is hydrolyzed and energy is released to drive an endergonic reaction.
- ADP and phosphate are free to be recycled.
GapsEnergy and life
Living systems are highly organized, which takes a constant input of energy. In each energy transfer some is lost as heat, so cells and ecosystems cannot run on the same energy again and again. ATP is the cell's energy currency: its hydrolysis to ADP and phosphate is exergonic, and cells couple it to endergonic reactions such as active transport and biosynthesis, so that the combined process has a negative free energy change.