Multiple Choice
Which of the following is true of protein structure?
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4. Biomolecules
Proteins
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Which of the following lists ranks these molecules in the correct order by size from smallest to largest?
A
Water, sucrose, glucose, protein
B
Protein, water, glucose, sucrose
C
Water, protein, sucrose, glucose
D
Glucose, water, sucrose, protein
E
Water, glucose, sucrose, protein
Verified step by step guidance1
Understand the molecular structure and size of each molecule: Water (H₂O) is a small molecule with a simple structure. Glucose (C₆H₁₂O₆) is a monosaccharide, a simple sugar with a larger structure than water. Sucrose (C₁₂H₂₂O₁₁) is a disaccharide, composed of two monosaccharides, making it larger than glucose. Proteins are large, complex molecules made up of amino acids, significantly larger than the other molecules listed.
Compare the molecular weights: Water has a molecular weight of approximately 18 g/mol. Glucose has a molecular weight of about 180 g/mol. Sucrose has a molecular weight of approximately 342 g/mol. Proteins vary greatly in size, but even small proteins have molecular weights in the thousands of g/mol.
Rank the molecules by size based on their molecular weights and structures: Start with the smallest, which is water, followed by glucose, then sucrose, and finally protein as the largest.
Review the options provided in the problem: Compare the order you determined with the options given. The correct order should match one of the options.
Identify the correct answer: The correct order by size from smallest to largest is Water, glucose, sucrose, protein, which matches the given correct answer.
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