science - digestion, food tests, enzyme activity

Question 1

digestion

Answer 1

larger molecules broken down into smaller ones to be absorbed by the body

Question 2

what happens in the mouth during digestion?

Answer 2

food is broken down mechanically and chemically(enzymes)

Question 3

what does the oesophagus do during digestion

Answer 3

links the mouth to stomach

Question 4

stomach function in digestion

Answer 4

contains hydrochloric acid to kill bacteria + enzymes to break down food

Question 5

Pancreas

Answer 5

produces digestive enzymes

Question 6

villi

Answer 6

structures in small intestine with large surface area

Question 7

what happens to the food in digestion

Answer 7

THe digested food is absorbed into bloodstream in the small intestine
excess water is absorbed into large intestine
undigested food passes out as faeces

Question 8

what liquid is used to test for starch and what is the positive result?

Answer 8

iodine, orange/ brown -> blue/black

Question 9

test liquid + positive result for sugar +( 1 step)

Answer 9

benedict’s solution (place in boiling water for 5 mins) , blue -> green,yellow, orange, brick red

Question 10

test liquid + positive result for protein

Answer 10

Biuret solution , blue -> purple

Question 11

lipids test liquid + positive result + step

Answer 11

ethanol and pour into water, then shake , turns cloudy white

Question 12

carbohydrase / amylase (breaks down __)

Answer 12

starch to sugar

Question 13

protease( breaks down ____ -> __)

Answer 13

proteins -> amino acids

Question 14

Lipase (breaks down ____ -> __)

Answer 14

lipids -> fatty acids + glycerol

Question 15

what parts of the body does starch break down into sugar

Answer 15

mouth + small intestine

Question 16

what parts of the body does proteins break down to amino acids

Answer 16

stomach + small intestine

Question 17

what parts of the body does lipids break down into fatty acids and glycerol

Answer 17

small intestine