Carbohydrate Structure and Function

Part A

Which molecule is not a carbohydrate?

	Starch
	Glycogen
	Lipid
	Cellulose

Correct

A lipid is a hydrophobic polymer, not a carbohydrate.

Part B

Which of the following statements about monosaccharide structure is true?

	Aldoses and ketoses differ in the position of their hydroxyl groups.
	A six-carbon sugar is called a pentose.
	All monosaccharides contain carbon, hydrogen, oxygen, and nitrogen atoms.
	Monosaccharides can be classified according to the spatial arrangement of their atoms.

Correct

This statement is true.

Part C

True or false? Peptidoglycan is a polysaccharide found only in bacteria.

	True
	False

Correct

Part D

Which complex carbohydrate contains only a-1,4-glycosidic linkages?

	Amylopectin
	Amylose
	Glycogen
	Cellulose

Correct

Amylose is formed from a-1,4-glycosidic linkages of glucose.

Part E

Which of the following complex carbohydrates is listed with its correct function?

	Amylose: main component of plant starch
	Chitin: constituent of bacterial cell walls
	Starch: primary energy-storage molecule in animals
	Cellulose: structural component of plant cell walls

Correct

Cellulose is indeed the main structural component of plant cells walls.

Part F

Which polysaccharide contains a modified monosaccharide?

	Starch
	Glycogen
	Peptidoglycan
	Cellulose

Correct

The N-acetylglucosamine and N-acetylmuramic acid units that make up peptidoglycan are composed of modified glucose monomers.