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Dehydration and hydrolysis reactions differ in their energy balance because:
ABoth reactions release stored energy to the cell
BBoth reactions consume energy from the cell
CDehydration needs energy and hydrolysis releases it
DHydrolysis needs energy and dehydration releases it
Answer & Solution
Correct answer: C. Dehydration needs energy and hydrolysis releases it
1. Dehydration synthesis forms a new covalent bond between two monomers.
2. Forming that bond typically requires an investment of energy.
3. Hydrolysis does the reverse, adding water to break the bond.
4. That release typically frees energy the cell can use to power other processes.
5. Options A and B are wrong because the two reactions run opposite ways, not the same way.
_Source: OpenStax Biology for AP(R) Courses (CC BY 4.0), Ch 3 'Biological Macromolecules', sections 3.1-3.5_
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