Test 1.3

Question 1

where are the three enzymes secreted?

Answer 1

pancreas

Question 2

what does starch get broken down into

Answer 2

glucose

Question 3

which enzyme breaks down starch

Answer 3

carbohydrase or amalayse

Question 4

why does enzyme activity decrease?

Answer 4

because it denatured

Question 5

what does fat break down into?

Answer 5

fatty acids and glycerol

Question 6

what is the optimum temperature

Answer 6

the peak temp before it decreases

Question 7

The formula to calculate energy in food

Answer 7

mass of water x temperature increase x 4.2 / mass of food sample

Question 8

2 reason why the food may have different masses

Answer 8

• incomplete burning of food sample

- was held too far away from the boiling tube

Question 9

whats the PH of the stomach

Answer 9

2 / 2.5

Question 10

where does lipase get digested?

Answer 10

small inetstine

Question 11

why is john fat

Answer 11

• John eats too much which can lead to having too much excess energy leading to obesity
• He eats food high in sugar which contributes to tooth decay and the increase in the risk of type 2 diabetes
• He eats food high in salt or sodium which means he has an increased chance of stroke and high blood pressure
• He also doesn’t exercise regularly which can lead to clogged arteries and circulatory problems

Question 12

why could the Ph fall?

Answer 12

The oil was digested into fatty acids

Question 13

The test used for starch

Answer 13

iodine goes from brown to black/blue

Question 14

The test used for protein

Answer 14

Biuret goes from light blue to lilac

Question 15

The test used for sugar

Answer 15

Benedicts reagent goes from blue to brick red

Question 16

what is the role of bile

Answer 16

• bile helps to neutralize the acid to provide alkaline conditions
• bile emulsifies fat by breaking them down from big fat globules to smaller fat globules to provide more surface area

Question 17

what part do olive oils/detergent act as ?

Answer 17

liquids detergent is added to simulate the activity of bile,it acts as an emulsifier

Question 18

what does the visking tubing show?

Answer 18

The visking tubing is selectively permeable meaning it has small pores that only allow small molecules like glucose or amino acids to pass through it. Large molecules like starch and proteins cannot pass through as they cannot fir through the pores.

Question 19

carbohydrase the enzyme…..

Answer 19

acts on starch
turns into the molecule glucose
the enzyme is produced in the mouth,pancreas and small intestine
and site of digestion is the mouth and small intestine

Question 20

Protease the enzyme….

Answer 20

acts on proteins
turns into the molecule amino acids
produced in stomach,pancreas,small intestine
site of digestion is stomach and small intestine

Question 21

Lipase the enzyme……

Answer 21

Acts on fats and oils (lipids)
turns into the molecule fatty acids and glycerol
produced in pancreas and small intestine
site of digestion is small intestine