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Questions and Answers
What type of bonds are present in starch molecules?
What type of bonds are present in starch molecules?
- β-1,4 linkages
- α-1,4 and α-1,6 linkages (correct)
- α-1,4 and β-1,6 linkages
- β-1,6 linkages
What is the main difference between gums and mucilages?
What is the main difference between gums and mucilages?
- Gums are sulphuric acid esters, while mucilages are composed of Ca, K, and Mg salts
- Gums are composed of Ca, K, and Mg salts, while mucilages are sulphuric acid esters (correct)
- Gums are composed of polysaccharides, while mucilages are composed of polyuronides
- Gums are composed of polyuronides, while mucilages are composed of polysaccharides
What is the result of hydrolyzing a polysaccharide?
What is the result of hydrolyzing a polysaccharide?
- A definite number of monosaccharides
- Only glucose molecules
- An indefinite number of monosaccharides (correct)
- A mixture of sugars and uronic acids
What is the type of linkage present in cellulose molecules?
What is the type of linkage present in cellulose molecules?
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What is the common name for the polysaccharide found in animals?
What is the common name for the polysaccharide found in animals?
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Study Notes
Polysaccharides
- Hydrolysis of polysaccharides produces an indefinite number of monosaccharide molecules called glycans.
Biologically Significant Polysaccharides
- Starch: a common polysaccharide of biological significance
- Glycogen (Animal starch): a common polysaccharide of biological significance
- Cellulose: a common polysaccharide of biological significance
- Inulin: a common polysaccharide of biological significance
Structure of Starch and Cellulose
- Starch: glucose units joined by α-1,4 and α-1,6 linkages
- Cellulose: glucose units joined by β-1,4 linkages
Derivatives of Polysaccharides
- Gums: consist of Ca, K, and Mg salts of complex substances called polyuronides
- Properties of Gums: on prolonged boiling with dilute acids, they yield sugar and uronic acids
- Mucilages: sulphuric acid esters
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