Test 1.3 Flashcards
where are the three enzymes secreted?
pancreas
what does starch get broken down into
glucose
which enzyme breaks down starch
carbohydrase or amalayse
why does enzyme activity decrease?
because it denatured
what does fat break down into?
fatty acids and glycerol
what is the optimum temperature
the peak temp before it decreases
The formula to calculate energy in food
mass of water x temperature increase x 4.2 / mass of food sample
2 reason why the food may have different masses
- incomplete burning of food sample
- was held too far away from the boiling tube
whats the PH of the stomach
2 / 2.5
where does lipase get digested?
small inetstine
why is john fat
- 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
why could the Ph fall?
The oil was digested into fatty acids
The test used for starch
iodine goes from brown to black/blue
The test used for protein
Biuret goes from light blue to lilac
The test used for sugar
Benedicts reagent goes from blue to brick red
what is the role of bile
- 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
what part do olive oils/detergent act as ?
liquids detergent is added to simulate the activity of bile,it acts as an emulsifier
what does the visking tubing show?
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.
carbohydrase the enzyme…..
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
Protease the enzyme….
acts on proteins
turns into the molecule amino acids
produced in stomach,pancreas,small intestine
site of digestion is stomach and small intestine
Lipase the enzyme……
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
