Cell Metabolism Review
LT1a
Before getting involved with the details of cellular respiration and photosynthesis, take a
second to look at the big picture. Photosynthesis and cellular respiration are key ecological
concepts involved with energy flow. Use your own paper to label the missing parts.
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LT1a
Question:
Use the diagram to explain the roles taken by ATP and enzymes in metabolism.
Answers
Enzymes
lower the energy of activation from a temperature (E) that would destroy cells to a body temperature.
speed up reactions to a rate that they can support life.
ATP serves to supply the energy of activation. This is a type of chemical work performed by the cell.
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LT1b
Question:
List the parts of ATP and arrange the available puzzle pieces to illustrate how those parts go together.
OH
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H
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LT1c
Questions:
Use a diagram (or the puzzle pieces) to demonstrate how an ATP molecule is made and broken down for energy.
What is the name of the process used to break down large macromolecules?
What is the process called when a phosphate group, with its high-energy bond, is transferred to another molecule?
Answer:
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LT1d
Question:
Create an organizer to show how anabolism, catabolism, cell metabolism, ATP, photosynthesis and cell respiration are all
connected. You may use the one presented in class or one that you have created.
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Explain why plants are green. The arrows on the “Reflected light” and the “Transmitted light” have been covered by colorless
arrows. What color should they be?
Plants have pigments that work together to absorb all of the colors of light except green which it reflects. Because the light is
reflected to our eyes, we see only the green light. The other colors are absorbed.
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Many students have trouble understanding the difference between the photosynthetic molecule and the photosynthetic
organelle. The best way to master these challenging bits of learning is to place them side-by-side and mentally beat them into
submission. So, here they are, side-by-side. Have at it!
How can bacteria photosynthesize if they don’t have any membrane-bound organelles?
The chloroplast is on the left and the chlorophyll is on the right. Chlorophyll embedded in the thylakoid membrane is what
makes that membrane green.
*Photosynthetic prokaryotes use chlorophyll, embedded into infolded membrane, to photosynthesize.
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Matter cycles and energy flows. In what form does energy take as it “flows” through matter?
It takes the form of excited electrons that are used to make ATP, boosted again by sunlight and then accepted and carried to
the stroma for the Calvin cycle to make glucose.
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Questions:
Explain how the sun’s energy is harnessed by the chloroplast to do the work of making glucose for the plant. Recall the
“Workman on a job site” analogy.
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