Question 1(a)(i)
[Maximum number: 1]
The main component of milk is a liquid that is an important solvent in the body.
State the name of this solvent.
IGCSE Biology Extended 4.1.1—Chemical elements that make up Topic Practice
4.1.1—Chemical elements that make up
• List the chemical elements that make up: carbohydrates, fats and proteins
Question 1(a)(ii)
[Maximum number: 2]
Enzymes are catalysts.
Enzymes are proteins.
State the names of the chemical elements found in all proteins.
Question 8
[Maximum number: 1]
Which identifies the chemical elements found in proteins?
carbon
hydrogen
oxygen
nitrogen
key
✓
✓
✓
✓
✓
✓
✓
χ
✓ = present
✓
χ
✓
x
x = absent
×
✓
×
✓
Question 8
[Maximum number: 1]
Which row shows the chemical elements contained in fats?
carbon
hydrogen
nitrogen
oxygen
key
✓
✓
χ
✓
✓
χ
✓
χ
✓ = present
χ
✓
✓
✓
χ= absent
✓
✓
χ
χ
Question 9
[Maximum number: 1]
Which statement about biological molecules is correct?
A
DNA contains the bases A, C, G and T.
B
Glycogen is made from glycerol molecules.
C
Oils are made from amino acids and glucose.
D
Proteins are made from fatty acids.
Question 9
[Maximum number: 1]
Which element is found in proteins but not carbohydrates?
A
carbon
B
hydrogen
C
nitrogen
D
oxygen
Question 10
[Maximum number: 1]
Which row shows the elements that make up a carbohydrate molecule?
carbon
hydrogen
nitrogen
oxygen
no
no
yes
yes
no
yes
no
yes
yes
yes
no
yes
yes
yes
yes
no
Question 2(a)(i)
[Maximum number: 2]
Red blood cells contain the protein haemoglobin.
State the names of the four chemical elements that are found in all proteins.
Question 5(c)(i)
[Maximum number: 1]
Phytoplankton are microorganisms that photosynthesise.
Krill and seals can be harvested to produce omega-3 fatty acids.
Many people take omega-3 fatty acids as a dietary supplement as they are thought to have health benefits in humans.
List the chemical elements found in all fats.
Question 6(e)
[Maximum number: 1]
Antibodies are proteins.
State the chemical elements present in all proteins that are also found in carbohydrates and fats.
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