259 Laboratory Manual for General, Organic, and Biochemistry, Seventh Edition 36

Question

259 Laboratory Manual for General, Organic, and Biochemistry, Seventh Edition 365 Locker Number Date Plense print last name first PRELIMINARY EXERCISES Experiment 26 The Characterization of Carbohydrates 1. Define the following terms: a. carbohydrato b. aldohexose c. reducing sugar 2. List the three major classes of carbohydrates. a. b. C. 3. Which test in this experiment is positive only for polysaccharides? 4. Wha t can be learned about a sugar by performing both the Benedict and Barfoed tests? 5. List the three common disaccharides and their hydrolysis products. a. b. C. 6. If an unknown carbohydrate gives a positive Molisch test, a negative iodine test, a negative Barfoed test, a negative Benedict test, but a positive Benedict test after hydrolysis, what is the carbohydrate?

Explanation / Answer

Ans 1 :

a )Carbohydrate : Carbohydrates are the biological molecules that contain carbon , hydrogen and oxygen . They serve as the energy source to our body.

b) Aldohexose are the compounds containing six carbons and an aldehyde group on one end.

c) Reducing sugar : Reducing sugars are the ones that are capable to act as reducing agents as they have free aldehyde or free ketone group.

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