Biology
The monomer of collagen is an amino acid whereas the monomer of cellulose is beta-glucose. The monomers in collagen are linked by peptide bonds whereas those of cellulose are beta (1,4)-glycosidic bonds. Collagen is an alpha helix polypeptide with a turn every three residues whereas cellulose is a straight chain with adjacent glucose molecules rotated 180 degrees with respect to each other. Collagen has hydrogen bonds between its chains (glycine on one chain and hydroxyproline on another strand), these hydrogen bonds account for its strength. Likewise, cellulose is a strong material because of the hydrogen bonds between the -OH and O of adjacent molecules. Collagen's macrofibre structure is that of triple helices lying parallel with covalent bonds at staggered ends of carboxyl and amino terminal, thus forming collagen fibre; in cellulose, chains of beta-glucose associate in groups to form micelles, micelles arrange in larger bundles to form microfibrils. Microfibrils combine by cross-linking of chains to form macrofibrils. Both collagen and cellulose are resistant to chemical change because of their stable macro structure
- #9. Carbohydrates - Polysaccharides
Molecules contain hundreds/thousands of monosaccharides linked into long chains. Molecules are enormous --> the majority do not dissolve in water --> good for storing energy (starch and glycogen) or for forming strong structures (cellulose)....
- #7.2 Biological Molecules - Syllabus 2016
2.1 Testing for biological molecules 2.2 Carbohydrates and lipids 2.3 Proteins and water This section introduces carbohydrates, proteins and lipids: organic molecules that are important in cells. Nucleic...
- #7.1 Biological Molecules - Syllabus 2015
? Structure of carbohydrates, lipids and proteins and their roles in living organisms ? Water and living organisms Learning Outcomes Candidates should be able to: (a) [PA] carry out tests for reducing and non-reducing sugars (including using colour...
- Comparison Between Starch, Glycogen And Cellulose
Comparison between Starch, Glycogen and Cellulose Characters Starch Glycogen Cellulose Monomer a-glucose a-glucose b-glucose Type of bond between monomers 1,4 glycosidic bond (amylose) + 1,4 and 1,6 glycosidic bond (amylopectin) 1,4 and...
- Proteins
PROTEINSProteins are polypeptides. i.e., linear chains of amino acids linked by peptide bonds. A Peptide bond is formed when ?COOH group of one amino acid reacts with ?NH2 group of next amino acid by releasing a molecule of water (dehydration). Proteins...
Biology
Q: Compare and contrast the structure of collagen and cellulose
The monomer of collagen is an amino acid whereas the monomer of cellulose is beta-glucose. The monomers in collagen are linked by peptide bonds whereas those of cellulose are beta (1,4)-glycosidic bonds. Collagen is an alpha helix polypeptide with a turn every three residues whereas cellulose is a straight chain with adjacent glucose molecules rotated 180 degrees with respect to each other. Collagen has hydrogen bonds between its chains (glycine on one chain and hydroxyproline on another strand), these hydrogen bonds account for its strength. Likewise, cellulose is a strong material because of the hydrogen bonds between the -OH and O of adjacent molecules. Collagen's macrofibre structure is that of triple helices lying parallel with covalent bonds at staggered ends of carboxyl and amino terminal, thus forming collagen fibre; in cellulose, chains of beta-glucose associate in groups to form micelles, micelles arrange in larger bundles to form microfibrils. Microfibrils combine by cross-linking of chains to form macrofibrils. Both collagen and cellulose are resistant to chemical change because of their stable macro structure
- #9. Carbohydrates - Polysaccharides
Molecules contain hundreds/thousands of monosaccharides linked into long chains. Molecules are enormous --> the majority do not dissolve in water --> good for storing energy (starch and glycogen) or for forming strong structures (cellulose)....
- #7.2 Biological Molecules - Syllabus 2016
2.1 Testing for biological molecules 2.2 Carbohydrates and lipids 2.3 Proteins and water This section introduces carbohydrates, proteins and lipids: organic molecules that are important in cells. Nucleic...
- #7.1 Biological Molecules - Syllabus 2015
? Structure of carbohydrates, lipids and proteins and their roles in living organisms ? Water and living organisms Learning Outcomes Candidates should be able to: (a) [PA] carry out tests for reducing and non-reducing sugars (including using colour...
- Comparison Between Starch, Glycogen And Cellulose
Comparison between Starch, Glycogen and Cellulose Characters Starch Glycogen Cellulose Monomer a-glucose a-glucose b-glucose Type of bond between monomers 1,4 glycosidic bond (amylose) + 1,4 and 1,6 glycosidic bond (amylopectin) 1,4 and...
- Proteins
PROTEINSProteins are polypeptides. i.e., linear chains of amino acids linked by peptide bonds. A Peptide bond is formed when ?COOH group of one amino acid reacts with ?NH2 group of next amino acid by releasing a molecule of water (dehydration). Proteins...