Name:
Date:
Explain 337: Powering Cellular Activities
Period:
Cellular Respiration:
You may know that yeast is added to dough when bread is made. The
dough is allowed to sit awhile, and it expands and rises. The texture
becomes fluffier, and the dough becomes filled with holes and pores,
like a sponge. But how does this relate to cellular respiration?
Read “How Cells Convert Food into Energy” on pages 340-343 of your text.
1. Do you see any similarities with the molecules that are involved in respiration and
photosynthesis?
2. Where does cellular respiration take place?
3. Why do you think it is so important that plants contain mitochondria?
4. What evidence do you have that cellular respiration occurs in plant cells? Think back to the
Elodea Photosynthesis lab.
5. What gases did the plant exchange?
6. Write the complete reactions for the combustion of methane and for respiration:
7. How is combustion similar to respiration?
8. Compare aerobic and anaerobic respiration. Use a t-table or a Venn diagram to list any
similarities and differences between them.
Read “ATP: The Fuel of Cells,” pg. 344
1. What functions are ATP molecules needed for?
2. What role does glucose play in cellular respiration?
3. Why is cellular respiration important for all living things, including plants?
4. What do you think is the relationship between photosynthesis and cellular respiration? Keep
in mind how the reactants, products, and energy in these processes might be related. The
generalized equations are shown here.
Photosynthesis
light + 6CO2 + 6H20 à
C6H12O6 + 6O2
energy
carbon dioxide
Cellular respiration
C6H12O6 + 6O2
Glucose
oxygen
water
à
enzymes
enzymes
6-carbon sugar
6CO2
+
carbon dioxide
oxygen
6H2O
water
+
ATP
energy
Read “Respiration During Exercise” pg. 345
1. Your cells need a steady supply of ATP when you are sitting, but what happens when you
exercise?
2. What happens to carbon dioxide levels in you blood and your breathing rate when you
exercise?
3. Why do they do this?
4. What role do aerobic and anaerobic respirations play in your muscles?
5. Why do your muscles burn when you are exercising hard and why are they sore the
following day?
6. Why are muscles so red in color?
7. Why is aerobic conditioning advantageous to athletes? Your answer should talk about ATP
and mitochondria: