Chemical Tests For Biologically Important Molecules

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Student Response sheet
Chemical Tests For Biologically Important Molecules
Table 1: Predicted Results of Benedict’s Test
Water
Glucose
Sucrose
Starch
Onion
Potato
Which of the solutions would be a negative control for Benedict’s?
•
Which of the solutions would be a positive control for Benedict’s?
•
Table 2: Actual Results of Benedict’s Test
Water
Glucose
Sucrose
Starch
Onion
Potato
Test
Result
Observed
Color
Which tested most strongly positive: glucose, sucrose, or starch?
•
Was the presence of monosaccharides detected in either onion or potato?
•
Procedure 2: Iodine Test for Starches
Table 3: Predicted Results of Iodine Test
Water
Glucose
Sucrose
Starch
Onion
Potato
Which of the solutions would be a negative control for iodine?
•
Which of the solutions would be a positive control for iodine?
•
Table 4: Actual Results of Iodine Test
Water
Glucose
Sucrose
Starch
Onion
Potato
Test
Result
Observed
color
Which is a polysaccharide: starch, glucose, or sucrose?
•
What has a higher amount of starch: potato, or onion?
•
Based on the iodine and Benedict’s tests, compare how potatoes and onions store energy
•
1
differently.

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