Two solutions, 1 and 2, each contained a mix of two different biological molecules. One solution contained starch and sucrose, and the other contained glucose and protein. The two solutions were tested with a variety of reagents to identify the presence of the biological molecules in the solution. The table shows the results recorded for the various tests. Which row identifies the two solutions?

Biology

IGCSE&ALevel

CAIE

Exam No：9700_w24_qp_11 Year：2024 Question No：10

Answer:

Knowledge points:

2.1.1 describe and carry out the Benedict’s test for reducing sugars, the iodine test for starch, the emulsion test for lipids and the biuret test for proteins

2.1.2 describe and carry out a semi-quantitative Benedict’s test on a reducing sugar solution by standardising the test and using the results (time to first colour change or comparison to colour standards) to estimate the concentration

2.1.3 describe and carry out a test to identify the presence of non-reducing sugars, using acid hydrolysis and Benedict’s solution

Answer:

Knowledge points:

Solution:

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