UNIT 3
O
O
H
C
H
O
C
H
H
C
N
N
C H
H2O
Energy
absorbed
y
erg
En
E ne
rgy
Energy
released
O
H
N
C
N
C
H
C
C
O
H
C
H
H
C
N
N
C H
Adenosine
diphosphate (ADP)
OH OH
H
Ribose C
OH OH
Two phosphates
HO P O P O C H
O
H C
Adenine
N
H
OH
Inorganic
phosphate
HO P OH
O
ATP–ADP Cycle
Adenosine
triphosphate (ATP)
OH OH
H
Ribose C
OH OH OH
Three phosphates
HO P O P O P O C H
O
N
C
H C
H
C
C
N
11
Adenine
N
H
Copyright © Glencoe/McGraw-Hill, a division of The McGraw-Hill Companies, Inc.
Name
Date
Class
Master
Basic Concepts
Use with Chapter 9, Section 9.1
CHAPTER 9 Energy in a Cell
141
Name
Date
Basic Concepts
Worksheet
11
Class
ATP–ADP Cycle
Use with Chapter 9, Section 9.1
1. What is the structural difference between ATP and ADP?
2. Which molecules are contained in both ATP and ADP?
3. In which structure, ATP or ADP, is more energy stored? Where is the energy stored?
4. Describe what takes place in the process of converting ADP to ATP.
5. Describe what happens in the process of converting ATP to ADP.
Copyright © Glencoe/McGraw-Hill, a division of The McGraw-Hill Companies, Inc.
6. Explain why the reactions shown in the transparency are considered to be part of a cycle.
7. Describe the role of proteins in the release of energy stored in ATP.
8. What are two ways that cells use energy released from the breakdown of ATP?
142
CHAPTER 9 Energy in a Cell
UNIT 3