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WorksheetsForm 3 2021 EOY
Total questions: 109
Worksheet time: 1hrs 13mins
What is the formula of Glucose?
C3H16O36
C632H123O2
C6H12O6
C12H6O12
Which of the following elements is NOT found in all organic molecules.
Carbon
Hydrogen
Sulfur
Oxygen
Glucose is a
Lipid
Protein
Simple sugar (monosaccharide)
Complex sugar (polysaccharide)
Which of the following is not a complex sugar (polysaccharide)?
Cellulose
Glycogen
Ribose
Starch
What element is found in proteins but NOT carbohydrates?
Carbon
Hydrogen
Nitrogen
Oxygen
Which of the following is NOT a function of proteins
Enzymes: speed up chemical reactions
Energy: stored energy in cells
Transport: movement of molecules into/out of cells
Structure: provides shape to cells and tissues
What is the colour change if you add Iodine (Brown colour) to the food contains protein?
Red Brick
No changes (Negative Results)
Black
Navy Blue
How do you test for lipids?
By using Ethanol and water
By using Benedicts solution
By using Iodine
By using Biuret test
Galactose
Galactose
What type of molecule contains glycerol?
simple carbohydrate
fat
complex carbohydrate
protein
What type of molecule is an enzyme?
simple carbohydrate
fat
complex carbohydrate
protein
Select all types of molecule which are used as energy store molecules
starch
fat
protein
glucose
A
B
C
D
Water is a good solvent.
What does this mean?
It dissolves well in many other substances
It flows easily through vessels
It is permeable to gases
Many substances dissolve well in it
What does DCPIP test for?
Proteins
Lipids
Carbohydrates
Vitamin C
State one factor other than pH which will affect enzyme activity
(a)
What is the optimum pH for stomach enzymes
pH 2
pH 7
pH 9
pH 12
What is the optimum pH for small intestine enzymes
pH 2
pH 7
pH 9
pH 12
During digestion, what is the function of an enzyme?
to break down fats into droplets
to break down food into small pieces
to break down large molecules into small molecules
to kill bacteria in food
Which food is a good source of Vitamin C?
boiled rice
canned fish
cooked meat
fresh fruit
Fish are a good source of Vitamin D.
State one effect of a diet that is deficient in vitamin D
(a)
The diet of a woman is very important during pregnancy.
State one source of iron in the diet
(a)
State the importance of iron in a pregnant woman's diet
(a)
State the name of one component of a pregnant woman's diet that is needed for the formation of bones in the fetus.
(a)
A healthy adult has 32 teeth.
State the umber of teeth lost by adult E
(a)
(a)
State the name of the process that is defined as the movement of digested food molecules into the cells of the body where they are used, becoming part of the cells
(a)
Water is a very important molecule for all living organisms.
State the name of the organ in humans where most water is absorbed
(a)
(a)
State the type of digestion that breaks down large pieces of food
(a)
(a)
(a)
State the name of the organ in the body that produces pepsin
(a)
It bites into food
It cuts food
It grinds food
It tears food
canine
incisor
molar
pre-molar
P and Q
P and R
Q and R
Q and S
T and U
U and V
V and W
W and T
(a)
Boiling food in water can reduce their nutrient content by destroying vitamins.
State the vitamin which is needed to prevent the disease scurvy.
(a)
(a)
(a)
Name the organ that stores bile
(a)
Which organ produces bile?
A
B
C
D
E
Which part of the alimentary canal where most of the digested food is absorbed
Stomach
Small intestines / duodenum
Small intestines / ileum
Large intestines
Which 50g portion of food contains the most protein?
banana
cabbage
fish
potato
Why is iron needed by the body?
to form strong bones
to make haemoglobin
to provide energy
to repair cells
The small intestine have many microvilli.
What is the role of microvilli?
decrease the surface area
allow more digestion to occur
increase surface area
allow greater absorption to occur
allow more assimilation to occur
State the process that is defined as: the taking of substances eg. food and drink, into the body through the mouth
(a)
State the process that is defined as: the breakdown of food into smaller pieces without chemical change to the food molecules
(a)
State the process that is defined as: the breakdown of large, insoluble molecules into small, soluble molecules
(a)
State the process which is defined as: the movement of small food molecules and ions through the wall of the intestine into the blood
(a)
State the process that is defined as: the passing out of food that has not been digested or absorbed, as faeces , through the anus.
(a)
Name Organ A
(a)
Name Organ C
(a)
Which organ is where assimilation occurs?
A
B
C
D
E
Which organ is where egestion occurs?
A
B
C
D
E
What type of molecule is an enzyme?
simple carbohydrate
fat
complex carbohydrate
protein
Which of the following factors would not affect the rate of an enzyme-controlled reaction?
Temperature
pH
Concentration of enzyme
Concentration of product
Concentration of substrate
Which of the following factors would not affect the rate of an enzyme-controlled reaction?
Temperature
pH
Concentration of enzyme
Concentration of product
Concentration of substrate
Which statement is true about enzymes?
The shape of an enzyme's active site matches the shape of its substrate
Enzymes are used up in biological reactions
Enzymes work faster at higher temperatures
Every enzyme has one specific substrate that it breaks down or builds up.
A
B
C
D
A student set up a test tube containing starch, water and amylase.
How could the student test whether the amylase had digested all the starch?
Add Biuret solution
add dilute hydrochloric acid
Add iodine solution
Weigh the test tubes and contents before and after the experiment
What broke down the starch?
amylase
boiled amylase
heat
water
Glycogen is a storage carbohydrate in animals. Glycogen is made from glucose.
State the type of biological molecules which catalyses reactions such as the conversion of glycogen to glucose
(a)
A
B
C
D
Which statement about enzymes is correct?
Enzymes become part of the product
Lowering the pH always slows down the reaction rate
Raising the temperature always increases the reaction rate
The specificity of an enzyme depends on the shape of the active site
P and Q
Q and R
R and S
S and P
Which statement about enzymes is true
Enzymes are carbohydrates
Enzymes are catalysts
Enzymes are living organisms
Enzymes are the same shape as the substrate
A
B
C
D
State the name of an enzyme that digests proteins
(a)
(a)
State the function of hydrochloric acid in the body
(a)
Galapagos iguanas feed on seaweed which contains starch and other carbohydrates.
State the name of the enzyme which breaks down starch.
(a)
Which of these is digested protease
amylase
maltase
trypsin
pepsin
X - maltase Y - amylase
X - maltase Y - lipase
X - starch Y - amylase
X - starch Y - lipase
Cells in the lining of the stomach secrete gastric juices, which contains hydrochloric acid and pepsin.
One role of this juice to to kill pathogens, what is the other?
(a)
What are the functions of pepsin?
catalyse the breakdown of protein
kill pathogens
digests molecules into amino acids
catalyses the breakdown of starch
digests molecules into fatty acids and glycerol
Lipase is involved in the breakdown of fats.
What are the products of fat digestion?
Fatty acids
Amino acids
Glycogen
Glucose
Glycerol
What term is a substance that increases the rate of a chemical reaction and is not changed by the reaction?
(a)
State the name of the proteins that function as biological catalysts
(a)
Enzymes are important in all living organisms in order to maintain reactions at a (a) necessary to maintain life
Increasing temperature will increase the reaction catalysed by enzymes until it begins to decline above what temperature?
10 degrees celsius
20 degrees celsius
30 degrees celsius
40 degrees celsius
What pH would be optimum for the protease trypsin in the small intestine?
pH 3
pH 5
pH 7
pH 9
pH 11
Increasing temperature affects the enzyme action because of which factors?
Check all that apply
Increased gravitational energy
Increased kinetic energy
Increased number of collisions
Increased size of active site
Increased denaturation
Where is amylase secreted from?
B
C
D
E
F
What is the product of amylase breaking down starch?
glucose
sucrose
maltose
cellulose
Where is maltase secreted from?
membrane of the epithelium lining the stomach
membrane of the epithelium lining the small intestines
membrane of the epithelium lining the large intestines
membrane of the epithelium lining the rectum
Where is lipase secreted from?
B
C
D
E
F
What are the roles of bile?
Check all which apply
increase the surface area of lipids for lipase to work better
making juices more acidic for enzymes action
emulsifying fats
breaking down maltose
neutralising juices from the duodenum
