Cell Respiration Worksheet
Name _______________________
1. ATP is a compound that is synthesized when (1) chemical bonds between carbon atoms are formed
during photosynthesis (2) energy stored in chemical bonds is released during cellular respiration (3)
energy stored in nitrogen is released, forming amino acids (4) digestive enzymes break amino acids into
smaller parts
2. The flow of energy through an ecosystem involves many energy transfers. The diagram
below summarizes the transfer of energy that eventually powers muscle activity.
The process of cellular respiration is represented by
(1) arrow A, only (2) arrow B, only (3) arrow C, only
(4) arrows A, B, and C
The diagram below represents a biochemical process.
3. Which molecule is represented by X? (1) DNA (2) protein (3) starch (4) ATP
Base your answers to questions 4 through 7 on the information in the diagram below and on your
knowledge of biology
4. In an autotrophic organism, substance B functions as a (1) source of energy
(2) vitamin (3) hormone (4) biotic resource
5. In a heterotrophic organism, substance A could be used directly for (1) photosynthesis
(2) synthesis of enzymes (3) a building block of starch
(4) a genetic code
6. Identify substance A. ___________________________________
7. Identify substance B. _____________________________________
8. Which statement best describes cellular respiration? (1) It occurs in animal cells but not in plant cells.
(2) It converts energy in food into a more usable form. (3) It uses carbon dioxide and produces oxygen.
(4) It stores energy in food molecules.
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Cell Respiration Worksheet
Name _______________________
9.. The graph below shows photosynthetic activity in an ecosystem over a 24-hour period.
Data for a study on respiration in this ecosystem should be collected during (1) interval A, from
only the producers in the ecosystem (2) intervals A and B, from only the consumers in the ecosystem
(3) intervals A and B, from both the producers and consumers in the ecosystem
(4) interval A only, from abiotic but not biotic components of the ecosystem
Base your answers to questions 10 through 12 on the diagram below and on your knowledge
of biology. The arrows in the diagram represent biological processes.
10. Identify process 2 and explain why it is essential in humans.
_______________________________________________________________________
11. Identify process 3. __________________________________
12. Identify what letter X represents. __________________________________
13. Muscle cells in athletes often have more mitochondria than muscle cells in nonathletes. Based on this
observation, it can be inferred that the muscle cells in athletes
(1) have a smaller demand for cell proteins than the muscle cells of nonathletes
(2) reproduce less frequently than the muscle cells of nonathletes
(3) have nuclei containing more DNA than nuclei in the muscle cells of nonathletes
(4) have a greater demand for energy than the muscle cells of nonathletes
14. Living organisms must be able to obtain materials, change the materials into new forms, remove
poisons, and move needed material from one place to another. Many of these activities directly require
(1) energy released from ATP (2) carbohydrates formed from receptor molecules (3) the synthesis of
DNA (4) the breakdown of energy-rich inorganic compounds
Base your answers to question 15 on the information below and on your knowledge of biology.
Carbon exists in a simple organic molecule in a leaf and in an inorganic molecule in the air humans
exhale.
15 Identify the carbon-containing molecule that humans exhale and the process that produces it.
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