Question

Which one of these is not like the others...In each set of 3 molecules CROSS OUT one option that does not fit and indicate the correct explanation for why it does not fit the set in the blank. For each set cross out only ONE molecule, and if the same set occurs twice choose a different molecule each time, using a different answer for each blank.

a) Glycogen Amylose Amylopectin

b) Chitin Cellulose Amylopectin

c) Chitin Cellulose Amylopectin

d) Triacylglycerol Sphingolipid Glycerophospholipid

e) Triacylglycerol Sphingolipid Glycerophospholipid

f) Proteoglycan Glycoprotein Lectin

Explanations - NOT ALL WILL BE USED

A. Two have α1→4 linkages; one has β1→4 linkages

B. Two have β1→4 linkages; one has α1→4 linkages

C. Two have α1→6 linkages; one has β1→6 linkages

D. Two have α1→6 branches, one does not

E. Two do NOT have α1→6 branches, one does

F. Two are made from D-glucose, one is not

G. Two are easily digestible by most animals, one is not

H. Two are used for energy storage, one is not

I. Two are made from glycerol, one is not

J. Two are made from fatty acids, one is not

K. Two are membrane lipids, one is not

L. Two contain protein components, one does not

M. Two have covalently attached carbohydrates, one does not

Answer 1

• Glycogen, amylose, amylopectin-amylopectin-two of them has alpha1-6 linkage and other doesn't.
• Chitin, cellulose, amylopectin-two has beta1-4 linkage and other has alpha1-4 linkage.
• Chitin, cellulose, amylopectin-two are energy storage system (plants has cellulose and animals with starch ie,amylose and amylopectin) and one not.
• Triacylglycerol, sphingolipid, glycerophospholipid-two are made of glycerol and one not.
• Triacylglycerol, sphingolipid, glycerophospholipid-two easily digests and one not.

Reasons:

Amylose has only alpha 1-4 linkage.

Amylopectin has alpha 1-4 linkage

Cellulose are energy storage in plants and starch(amylose and amylopectin) in animals.

The substance with long chains and interlinkage are difficult to digest.