BIOMOLECULES AND ENZYMES

BIOLOGY

POLYSACCHARIDES

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
____ contains alternating residues of D-glucuronic acid and N-acetylglucosamine.
A
Pectine
B
Blood Group Antigens
C
Chondroitin sulfate
D
Hyaluronic Acid
E
Heparan sulfate
Explanation: 

Detailed explanation-1: -Hyaluronan is a polymer consisting of disaccharides with D-glucuronic acid and D-N-acetylglucosamine linked together via alternating beta-1, 4 and beta-1, 3 glycosidic bonds. It is one of the main components of the extracellular matrix and is also present in the articular cartilage as a coating on chondrocytes.

Detailed explanation-2: -2.7. Chondroitin sulfate is comprised of alternating N-acetylgalactosamine and glucuronic acid, with variable sulfation along the polysaccharide.

Detailed explanation-3: -Hyaluronan (HA) is also a linear polysaccharide constituted of alternated N-acetyl--D-glucosamine and -D-glucuronic acid residues. Hyaluronan possesses lubricating functions in the cartilage, participates in the control of tissue hydration, water transport, and in the inflammatory response after a trauma.

Detailed explanation-4: -Hyaluronic acid is a linear polysaccharide, with the structure of glucuronic acid and N-acetylglucosamine repeating units linked via alternating -1, 4 and -1, 3 glycosidic bonds.

Detailed explanation-5: -Hyaluronic acid (HA) has the simplest structure of all GAGs and does not require additional sulfation of functional groups in the Golgi apparatus as do the other GAGs. Instead, the structure consists of sequentially bound glucuronic acid and N-acetylglucosamine residues.

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