Chp 2 AS Level: Quick revision

Put the terms into their category.

Groups:

(a) triglycerides

,

(b) phospholipids

,

(c) both

• partially hydrophobic

• two fatty acids

• completely hydrophobic

• three fatty acids

• phosphate head

• fatty acids

• glycerol

• ester bonds

Organize these options into the right categories.

Groups:

(a) monosaccharides

,

(b) disaccharides

,

(c) polysaccharides

• glycogen

• sucrose

• cellulose

• α-glucose

• all reducing

• only one glycosidic bond

• fructose

• maltose

• multiple glycosidic bonds

• starch

• β-glucose

• lactose

• galactose

Categorize these descriptions.

Groups:

(a) α-glucose

,

(b) β-glucose

,

(c) neither

• maltase

• glycogen

• cellulose

• amylase

• amylopectin

• amylose

• maltose

Choose compounds that are found in plant cell wall other than cellulose.

• hemicellulose

• pectin

• glycogen

• amylose

Hydrogen bonds are found between β-glucose molecules of one cellulose molecule.

• true

• false

Where can we find collage fibres? (Answers could be more than one)

• wall of arteries

• wall of veins

• wall of capillaries

Answer explanation

Wall of capillaries is made of one layer of endothelial cells. No other components, including collagen fibres are found.

Only cellulose is the polymer made of β-glucose.

• true

• false

Which one is the correct image of a glycosidic bond?

• 
• 
• 
• 

Many subunits or ​ (a)   make up a polymer. A polymer is also called ​ (b)   since it has huge molecular mass and large size. The examples are ​ (c)   which are later modified into proteins and ​ (d)   which can be either DNA or RNA. ​ A molecule of ​ (e)   therefore is not included in this category even though it is an organic molecule.

• monomers
• macromolecule
• polypeptides
• polynucleotides
• lipid
• water
• polysaccharides

Organize these options into the right categories

Groups:

(a) amylose

,

(b) amylopectin

,

(c) glycogen

• having the most branches among polysaccharides

• straight part of starch

• the branched part of starch

• having only 1,4-glycosidic bonds

• found as energy store in animals