B3 Orginisation and differentiation

Question 1

what are carbohydrates made of?

Answer 1

simple sugars

Question 2

test for sugar?

Answer 2

blue Benedict’s solutions turn brick red on heating

Question 3

test for starch?

Answer 3

yellow iodine turns blue/black

Question 4

test for lipids?

Answer 4

ethanol emulsion gets a misty layer at top

Question 5

Test for protein (amino acids)?

Answer 5

Biuret reagent turns blue to purple

Question 6

what are lipids made from?

Answer 6

fatty acids and glycerol

Question 7

whats a catalyst?

Answer 7

increases rate of chemical reaction without using itself up

Question 8

what are biological catalysts?

Answer 8

specific reactions due to there active site , lock and key action enzyme action

Question 9

What are enzymes ?

Answer 9

proteins, amino acids are folded to form the active site, which matches a specific substrate molecule

Question 10

what is catalysed by enzyme?

Answer 10

substrate binds to the active site

Question 11

what is metabolism?

Answer 11

sum of all reactions in the body

Question 12

how are enzymes affected ?

Answer 12

by temp, pH, high temp denature, pH affect the shape of the active site

Question 13

what does digestion involve?

Answer 13

breakdown of large insoluble molecules to soluble substances

Question 14

what does amylase do?

Answer 14

break down starch into simple sugars

Question 15

what does protease do?

Answer 15

break down protein into amino acids

Question 16

what does lipase do?

Answer 16

break down lipids to fatty acids and glycerol

Question 17

where does protease work best?

Answer 17

in low pH, stomach

Question 18

what is produced in the pancreas?

Answer 18

amylase and lipase

Question 19

where does amylase and lipase work best?

Answer 19

alkaline

Question 20

what does the liver do?

Answer 20

secretes bile that neutralises acids and emulsifies fat