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Questions and Answers
What is the classification of monosaccharides based on the number of carbon atoms?
What is the classification of monosaccharides based on the number of carbon atoms?
- Maltose, lactose, and sucrose
- Monosaccharides, disaccharides, oligosaccharides, and polysaccharides
- Aldoses and ketoses
- Trioses, tetroses, pentoses, and hexoses (correct)
What is the cause of lactose intolerance as mentioned in the text?
What is the cause of lactose intolerance as mentioned in the text?
- Deficiency of lactase due to viral infection
- Deficiency of lactase due to bacterial infection
- Deficiency of lactase due to gene defect (correct)
- Deficiency of lactase due to aging
Which compound represents a ketohexose?
Which compound represents a ketohexose?
- Glucose
- Galactose
- Fructose (correct)
- Sucrose
What type of bond links two monosaccharides in maltose?
What type of bond links two monosaccharides in maltose?
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Which compound is an example of a disaccharide?
Which compound is an example of a disaccharide?
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Study Notes
Monosaccharide Classification
- Monosaccharides are classified based on their number of carbon atoms.
- Trioses have three carbon atoms.
- Tetroses have four carbon atoms.
- Pentoses have five carbon atoms.
- Hexoses have six carbon atoms.
- Heptoses have seven carbon atoms.
Lactose Intolerance
- Lactose intolerance occurs due to the deficiency or absence of lactase, the enzyme responsible for breaking down lactose.
- Lactase deficiency leads to the accumulation of undigested lactose in the intestines.
- Undigested lactose ferments in the intestines, producing gas and other byproducts causing symptoms like bloating, cramps, and diarrhea.
Ketohexose
- Fructose, a six-carbon sugar with a ketone group, is a ketohexose.
Maltose Bond
- Maltose is a disaccharide formed by the glycosidic linkage of two glucose molecules.
- The glycosidic bond is an α(1→4) bond, meaning the first glucose molecule is linked to the fourth carbon atom of the second glucose molecule.
Disaccharide Example
- Maltose is an example of a disaccharide.
- It is a disaccharide composed of two glucose molecules linked together by a glycosidic bond.
- Maltose is found in barley, wheat, and rice.
- It is produced when starch is hydrolyzed.
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