Fill in the blanks. No answer is used more than once. (a) ___________ sugars are

Question

Fill in the blanks. No answer is used more than once. (a) ___________ sugars are monosaccharides in which a hydroxyl group is replaced with a hydrogen atom (b) _________ is a homopolymer composed of a (1-4)-linked N-acetyl-D-glucosamine residues that is the principle structural component of the exoskeleton of various groups of invertebrates (c) ___________ is a homopolysaccharide that cannot be digested by mammalian salivary, gastric, or pancreatic enzymes. (d) N-linked sugars are attached to proteins as a 14-residue oligosaccharide during translation in the ___________ (e) ___________ is a galactose joined to a glucose by a Beta-1, 4 glycosidic bond.

Explanation / Answer

Ans. A. Deoxyribose sugar. In deoxyribose sugar, there is a H-atom (instead of -OH like ribose sugar) at 2’-Carbon.

B. Chitin- Principle structural component of exoskeleton of various groups of invertebrates.

C. Cellulose- a homopolymer of glucose, can’t be digested by mammalian salivary, gastric or pancreatic enzymes. The digestion of cellulose in cattle in mediated by bacteria in their gut.

D. Rough Endoplasmic reticulum. During translation of a protein needed to be exported out of cytoplasm, the mRNA remains attached to rough endoplasmic reticulum.

E. Lactose is a dimer of galactose and glucose lined together by b-1,4 glycosidic bond.    

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