Multiple Choice
Which two primary sources of energy power living systems?
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7. Energy and Metabolism
Introduction to Energy
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Which statement best describes how organisms demonstrate the transformation of energy?
A
Plants convert light energy from the sun into chemical energy through photosynthesis.
B
Animals create energy from nothing to power their cells.
C
Organisms store energy by breaking down ATP into glucose.
D
Energy is destroyed during cellular respiration.
Verified step by step guidance1
Understand the concept of energy transformation in biology: Energy cannot be created or destroyed (as per the law of conservation of energy), but it can be transformed from one form to another. Organisms rely on this principle to sustain life processes.
Review the process of photosynthesis: Plants, algae, and some bacteria convert light energy from the sun into chemical energy stored in glucose molecules. This process occurs in the chloroplasts and involves the use of carbon dioxide and water.
Examine the role of animals in energy transformation: Animals do not create energy from nothing. Instead, they obtain energy by consuming organic molecules (like glucose) and breaking them down through cellular respiration to produce ATP, the energy currency of cells.
Clarify the role of ATP and glucose: ATP is not broken down into glucose. Instead, glucose is broken down during cellular respiration to produce ATP, which stores and provides energy for cellular processes.
Address the misconception about energy destruction: Energy is not destroyed during cellular respiration. Instead, it is transformed from the chemical energy in glucose into ATP, with some energy lost as heat during the process.
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