C1: Biolpgical Molecules

Question 1

glycogen is (1/3 of polysaccharides)

Answer 1

• main source of energy in aminals
• forms glucose by hyrdolysis
• large amt of branches = energy is released quickly bc. E can move onto + act simultaneously on more molecules and break their glyosidic bonds
• large but compact = store lots of energy
• insoluble = water can’t get into cell, good for storing glucose in liver + muscle

Question 2

diferrences between DNA and RNA

Answer 2

DNA has deoxyribose sugar, thymine, and is a double-stranded helix.
RNA has ribose sugar, uracil, and is single-stranded and shorter

Question 3

glycosidic bond is

Answer 3

bond formed between 2 sugar molecules by a condensation reaction, eg. starch, maltose etc

Question 4

maltose is

Answer 4

alpha

glucose + glucose

Question 5

lactose is

Answer 5

beta

glucose + galactose

Question 6

sucrose is

Answer 6

alpha

glucose + fructose

Question 7

features of cellulose (1/3 polysaccharides)

Answer 7

• not coiled, long unbranched chain
• has B-glucose, with 1-4 glycosidic bonds
• a fibrous protein
• has H+ bonds between adjacent molecules which create microfibrils = strong structural support

Question 8

Monosaccharides join together to form disaccharides such as … by …

Answer 8

such as glucose, lactose, maltose

by glyosidic bonds

Question 9

starch is the main…. In plants. Its made from two alpha glucose polysaccharides….

Answer 9

main energy storage material jn plants

amylose and amylopectin

Question 10

cellulose is

Answer 10

• component of plant cell walls
• straight chained
• linked by H bonds to form microfibrils, so cellulose provides structural support