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WorksheetsB3 AQA Organisation & Digestive System (more detail)
Total questions: 30
Worksheet time: 16mins
Which labelled part of the diagram is the oesophagus?
1
2
7
5
Which labelled part of the diagram is the large intestine?
6
4
7
5
What is the name of the organ labelled as number 7?
Liver
Stomach
Pancreas
Oesophagus
Which part of the digestive system is the main site for nutrients to be absorbed into the blood?
Small intestine
Stomach
Pancreas
Large intestine
Which kind(s) of digestion occur in the mouth?
Mechanical and chemical
Mechanical only
Chemical only
Which kind(s) of digestion occur in the stomach?
Mechanical and chemical
Mechanical only
Chemical only
What are enzymes also referred to as?
biological catalysts
biological chemicals
chemical catalysts
Which type of polymer are enzymes made of?
protein
carbohydrate
fat
Enzymes have an active site which has a specific shape in order to fit with a specific _____________
substrate
substance
enzyme
complex
Enzymes and their specific substrates fit together like...
lock and key
hypothesis
catalysts
chemicals bonding
Enzymes can break substrates down or build them into new substances. Which combination of definitions is correct?
anabolic = build; catabolic = break down
anabolic = break down; catabolic = build
catabolic = build; anabolic = break down
Proteins are built up out of (& break down in to)... ?
amino acids
simple sugars
fatty acids and glycerol
Enzymes that break down proteins are called
proteases
amylases
lipases
carbohydrases
Enzymes that break down fats (lipids) are called
proteases
amylases
lipases
carbohydrases
What is the substrate for amylase?
starch
protein
glucose
fats (lipids)
Trypsin and pepsin break down proteins. Which type of digestive enzyme are they?
protease
lipase
carbohydrase
How do we test for the presence of starch?
iodine turns blue-black
iodine turns orange-brown
Biuret reagant turns purple
Benedict's test turns red-orange
How do we test for the presence of sugars (e.g. glucose)?
iodine turns blue-black
iodine turns orange-brown
Biuret reagant turns purple
Benedict's test turns red-orange
What do fats (lipids) break down into?
amino acids
fatty acids and glycerol
sugars
If an enzyme's shape changes and it won't be able to work anymore. What do we say has happened to the enzyme?
It has denatured
It has died
It has an active site
It's extinct
What happens to the activity of the enzyme as temperature increases?
It increases up to its optimum temperature
It decreases up to its optimum temperature
It increases
It decreases
What happens to the enzyme beyond its optimum temperature?
It is denatured
It dies
No change
What does optimum pH mean for an enzyme?
Optimum pH is the pH at which the enzyme is...
working at its fastest rate
working at its slowest rate
All enzymes have the same optimum pH, true or false
True
False
Why do different enzymes have different optimum pHs?
Because they're adapted to work in different environments
Because they only work in neutral pH
Because they work best at different temperatures
Whereabouts in the human body would the enzyme on the left be found?
stomach
small intestine
mouth
large intestine
Wherebouts are villi found in the digestive system?
small intestine lining
stomach lining
large intestine lining
oesphagus
Which of these is not an adaptation of the villi for absorbing nutrients from digestion?
good blood supply
large surface area
moist surface
thick walls
Which of these is the correct if we put these structures in order from smallest to largest?
cells > tissues > organs > organ systems > organism
organism > organ systems > organs > tissues > cells
tissues > cells > organs > organ systems > organism
cells > organs > organ systems > tissues > organism
What does the body use the amino acids from digestion for?
to build proteins
for energy
for energy and insulation
as vitamins and minerals
