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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.
Emboly Movement - Involution It denotes turning in or rolling over. Involution of mesodermal blastomeres has been observed in Amphioxus, reptiles, monotremes, amphibians,
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Coding sequence is the portion of the gene or the mRNA which actually codes for a protein. Introns are not coding for the sequences; nor are the 5' or 3' untranslated regions (or
Social Basis of Primitive Life: In the previous section, we gave you a glimpse of how the primitive human beings faced the problems of day to day existence and found some so
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Explain the presence of haustoria in nuclear and helobial endosperm
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a) Which vitamin helps to maintain resistance to infectious diseases? b) Name two foods which are a good source of this vitamin. a) Vitamin A (retinol) helps m
Mortality - Population Parameters and Regulation The death of an individual in a population is known as mortality. Mortality rate like natality rate can be expressed as the nu
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