Complex Carbohydrates

Complex carbohydrates contain three or more sugar units linked in a chain, with most containing hundreds to thousands of sugar units.

They are digested by enzymes to release the simple sugars.

Starch, for example, is a polymer of glucose units.

Question 1 of 1

A 7-year-old female presents with dehydration after 3 days of explosive diarrhea after consuming a large amount of ice cream. Analysis of her fecal matter reveals a large amount of lactose. Which of the following sugar pairs would be found in this disaccharide?

A

Fructose and glucose joined by a α-1, 2 bond

B

Galactose and fructose joined by a β-1, 2 bond

C

Galactose and glucose joined by a β-1, 4 bond

D

Two molecules of glucose joined by a α-1, 1 bond

E

Two molecules of glucose joined by a α-1, 4 bond

Complete Quiz and View Results

You will be able to view all answers at the end of your quiz.

The correct answer is C. You answered C.

Explanation:

The answer is C. Disaccharides are carbohydrates composed of two sugar molecules. Lactose in this case is composed of galactose and glucose joined by a β-1,4 glycosidic bond. Sucrose is a disaccharide of a fructose and a glucose molecule joined by a α-1,2 glycosidic bond. Maltose is a disaccharide of two glucose molecules joined by a α-1,4 glycosidic bond. There is no disaccharide composed of fructose and galactose