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Most proteins made by ribosomes on the RER (rough endoplasmic reticulum) are glycoproteins, which is they hold short chains of carbohydrates (oligosaccharides) covalently related to them during passage by the Golgi and RER complex. Two major types of oligosaccharide linkage exist:
? O-linked oligosaccharides are commonly attached to the protein through O-glycosidic bonds to OH groups of Thr or Ser side chains. The residues which are changed are frequently in a region of the polypeptide chain which is rich in Thr and Ser residues. In plant glycoproteins, the OH sets of hydroxyproline (Hyp) residues can be glycosylated, by the hydroxylysine (Hyl) reduce in the mammalian protein collagen can be O-glycosylated.
? N-linked oligosaccharides are related to the protein via N-glycosidic will bonds to the NH2 where the Asn occurs in the sequence Asn-X-Ser (or Thr) where X is many amino acids except Pro. If the Asn is N-glycosylated the Thr or Ser residue in this motif is not O-glycosylated.
define each term
Why is it important that a cell membrane does not allow all dissolved substances to diffuse freely through it? If the cell membrane were freely permeable, harmful substances co
Starch exists in plants as insoluble starch granules in chloroplasts. Each starch granule holds a combination of two polysaccharide forms, amylopectin and amylose.
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Suppose that the type of drink did not affect which can floated or sank. May be the cans themselves were different in some way. May be something besides soda got into one of the ca
Classification of Living Organisms The world of living organisms is extremely diverse. Biologists call these diverse forms 'species'. It is estimated that over fifteen lakh (1
The feasible methods of stabilization within the constraints of retaining natural status: Complex formation: Anthocyanin occurs naturally as complexes which are relatively st
Composition of agar Agar we learnt consists of a mixture of agrose and agropectin. Agrose has a linear polymer structure consisting of alternating D-galactose and 3,6-anhydro
sizes in some biological systems glucose
The initial evaluation of new onset heart failure should include an electrocardiogram, chest radiograph, and B-type natriuretic peptide assay. The cardiac rhythm may be normal sinu
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