digestion

Question 1

why do we break down and reassemble major nutrients

Answer 1

most of the molecules in food are too large

Question 2

function of carbohydrates

Answer 2

energy, glucose is main respiratory substrate

Question 3

sources of carbohydrates

Answer 3

potatoes, rice, bread, fruit, sweets

Question 4

function of protein

Answer 4

growth and repair

Question 5

sources of protein

Answer 5

meat, eggs, cheese

Question 6

function of lipids

Answer 6

energy, make up cell membrane
essential for growth

Question 7

sources of lipids

Answer 7

butter, oily fish

Question 8

starch is a _____ of glucose

Answer 8

polymer

Question 9

what are glucose molecules used for

Answer 9

respiration
glycogen

Question 10

what are proteins made up of

Answer 10

amino acids

Question 11

where is excess amino acid broken down

Answer 11

liver

Question 12

esters

Answer 12

type of organic compound formed in the reaction between an alcohol and a carboxylic acid.

Question 13

food test for sugar

Answer 13

add benedict’s solution to food and heat in a water bath

Question 14

sugar food test result

Answer 14

changes colour to red

Question 15

food test for starch

Answer 15

add iodine to food being tested

Question 16

starch food test result

Answer 16

if it contains starch will turn blue/black

Question 17

food test for protein

Answer 17

biuret test
purple colour if protein is present

Question 18

food test for fat

Answer 18

Sudan III test
add equal amounts of food and water, add drops of Sudan III.

Question 19

result for fat food test

Answer 19

red stained layer forms on surface of water if fat is present

Question 20

function of human digestive system (2)

Answer 20

breaks down complex food substances
provides the very large surface area for maximum absorption of food

Question 21

mouth

Answer 21

mechanical digestion
amylase for carbs

Question 22

stomach

Answer 22

digestion of protein; small molecules such as alcohol absorbed

Question 23

duodenum

Answer 23

digestion of carbohydrate and protein; begins the digestion of lipids

Question 24

ileum

Answer 24

Completes the digestion of carbohydrates and proteins into single sugars and amino acids

Question 25

large intestine

Answer 25

absorption of water

Question 26

what are enzymes

Answer 26

biological catalysts

Question 27

catalysts

Answer 27

lower activation energy and speed up reactions

Question 28

at what temp do enzymes in our body work best

Answer 28

37°

Question 29

function of saliva in digestion

Answer 29

lubrication to help swallow
contains amylase to break down starch