REFLECTION 8: STARCH, GLYCOGEN & CELLULOSE

Hello and Welcome back to my Biochem Blog!!! Continuing on the topic of Carbohydrates today, we will be looking at Polysaccharides and three in more detail, those of which are Starch, Glycogen & Cellulose. 

I have learnt a thinking strategy that you all may find useful if you don’t already know. When you hear a word, any word, begin in your mind to ask questions, and search your brain for everything that you know about that word, and you will find that you actually know more than you really think. In many cases when people in general are faced with something they tend to panic and believe that they don’t remember or don’t know but in actuality you do know you just need to find it!!

So lets Begin!

What are Polysaccharides?

They are polymers of monosaccharides.

How are they formed? 

Polysaccharides are made by the joining of many monosaccharides by a reaction known as Condensation. In my previous post, we looked at Monosaccharides and the Glycosidic bond so it will not be anything new for me to say that in the formation of Polysaccharides each Monosaccharide is added to the chain of Monosaccharides by means of a GLYCOSIDIC BOND. Continuous addition of Monosaccharides leads to the formation of a Macromolecule.

Starch, Glycogen & Cellulose

In class and our lab we had to set up a table to state the major differences or similarities between the three most important Polysaccharides on the planet, and I found that to be an easier way as it is a lot of information to take in. Below is my table that can be used to compare and contrast the three. 

Starch

Glycogen

Cellulose

Composition

2 polymers- amylase & amylopectin  (alpha glucose)

Similar to the structure of amylopectin (alpha glucose)

Composed of beta glucose molecules

Linkages

Glucose monomers are linked by 1,4 glycosidic bonds

Glucose monomers are linked by 1,4 & 1,6 glycosidic bonds

1,4 glycosidic bonds & hydrogen bonds between cellulose molecules

Chain

Unbranched chain glucose which then folds up to form a coil or helix

Branched polymer with more branches than amylopectin

Unbranched linear polymer

Thanks again for viewing my blog! Happy Learning!

References-

Featured Image-

http://www.goldiesroom.org/Note%20Packets/04%20Biochemistry/03%20Biochemistry–Lesson%203.htm

Biochem JM Youtube- Carbohydrates

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