Download 2.2 reading study guide answers

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Section 2.2 Reading/Study Guide
Cell Energy
1. Why do cells need energy?
Cells need energy to perform functions for life and survival, growth and
reproduction.
2. Where do plant cells get their energy?
Plant cells get the energy they need from the sun.
3. Where do many animal cells get the energy they need?
Animal cells get the energy they need by breaking down food.
FROM SUN TO CELL
D __ 4.Where does almost all of the energy that fuels life come from?
a. the Earth
c. plants
b. gasoline
d. the sun
5. Plants are able to change the sun’s energy into food through the process of
photosynthesis
6. The molecules in plant cells that absorb light energy are called pigments.
7. Plants get their green color from chlorophyll.
8. What is glucose?
Glucose is a type of simple sugar or carbohydrate that acts as a plants food.
9. Explain why glucose is important to a plant cell.
Glucose acts as a food source that allows plants to complete necessary life
functions.
10. Photosynthesis produces oxygen and glucose.
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GETTING ENERGY FROM FOOD
11. Cells use cellular respiration to break down food.
12. Many cells are able to get energy without using oxygen through a process
called fermentation.
13. Why is breathing important to many organisms?
Breathing is important because it allows organisms to take in oxygen and get
rid of CO2. Oxygen from breathing is necessary for the cellular respiration
process.
14. Describe what takes place during cellular respiration in complex organisms.
Food such as glucose is broken down into CO2 and energy is released.
15. What does your body do with the energy released during cellular respiration?
Your body uses the energy released during cellular respiration to maintain
equilibrium (balance) ATP is formed to fuel all life functions.
16. Adenosine triphosphate, also called ATP, supplies energy that fuels cell
activities.
17. Cellular respiration in the cells of eukaryotes takes place in mitochondria
inside the cell.
18. During photosynthesis, plant cells use carbon dioxide to make glucose and
release oxygen. How is this different from cellular respiration?
In cellular respiration, cells use oxygen to breakdown glucose and release
CO2, water and energy.
19. Why do you get a burning sensation in your muscles during strenuous
exercise?
After exercise muscles that did not get enough oxygen from cellular
respiration seem to burn. This is a result of fermentation. Fermentation does
not use oxygen to get energy. Lactic acid forms in the muscles. This is the
reason for the burning sensation.
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The Cell in Action
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20. What is another kind of fermentation?
There is another kind of fermentation that occurs in bacteria and yeast.
21. How does the process of fermentation help bread rise?
Yeast forms CO2 during fermentation. The bubbles of CO2 create a gas that
causes the dough to rise.
Match the correct description with the correct term. Write the letter in the space
provided.
D _ 22.This occurs when cells use oxygen to
produce energy from food.
F__ 23.This is the breakdown of food without
using oxygen.
B _ 24.This forms carbon dioxide, CO2, during
fermentation and is used to help
bread rise.
C _ 25.This is converted into food by the
process of photosynthesis.
a. oxygen
b. yeast
c. the sun’s energy
d. cellular respiration
e. water, carbon dioxide, and
energy
f. fermentation
A _ 26.This is released during photosynthesis,
when cells take in CO2.
E _ 27.This is released by cells during cellular
respiration.
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The Cell in Action
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Write the letter of the correct answer in the space provided.
C __ 1.Cellular respiration is the process by which
a. plant cells create glucose.
b. cells grow and reproduce.
c. cells use oxygen to produce energy from food.
d. cells breakdown food without using oxygen.
B __ 2.Fermentation in muscle cells produces
a. glucose.
b. lactic acid.
c. water.
d. bacteria.
C __ 3.Photosynthesis allows
a. an animal cell to get energy from food.
b. a cell to produce energy without oxygen.
c. a plant to produce food (glucose).
d. a plant leaf to turn green.
Match the correct definition with the correct term. Write the letter in the space
provided.
C __ 4.the process a plant uses in order to create
glucose
E __ 5.the place where cellular respiration in
eukaryotes takes place
D __ 6.the process cells use to produce energy
without oxygen
a. ATP
b. cellular respiration
c. photosynthesis
d. fermentation
e. mitochondria
B __ 7.C6H12O6  6O2  6CO2  6H2  Energy
A __ 8.the substance that supplies energy to fuel
cell activities
Original content Copyright © by Holt, Rinehart and Winston. Additions and changes to the original content are the responsibility of the instructor.
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The Cell in Action