Sucrose (cane sugar) is a disaccharide used by plants as a transport molecule - VCE - SSCE Biology - Question 18 - 2008 - Paper 1
Question 18
Sucrose (cane sugar) is a disaccharide used by plants as a transport molecule. Sucrose is formed in the following reaction
glucose + fructose ⇌ sucrose
With refe... show full transcript
Worked Solution & Example Answer:Sucrose (cane sugar) is a disaccharide used by plants as a transport molecule - VCE - SSCE Biology - Question 18 - 2008 - Paper 1
Step 1
A. glucose and fructose are polysaccharides.
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Answer
This statement is incorrect. Glucose and fructose are both monosaccharides, not polysaccharides. Polysaccharides are long chains of monosaccharide units.
Step 2
B. the production of sucrose is an endergonic reaction.
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Answer
This statement is correct. The formation of sucrose from glucose and fructose requires an input of energy, thus it is classified as an endergonic reaction.
Step 3
C. sucrose is a reactant and glucose is a product of the reaction.
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Answer
This statement is incorrect. In the synthesis of sucrose, sucrose is the product while glucose and fructose are the reactants.
Step 4
D. a molecule of fructose contains more stored energy than a molecule of sucrose.
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Answer
This statement is incorrect. A molecule of sucrose, being a disaccharide, contains more stored energy than a single monosaccharide like fructose due to the additional glucose unit.
