IGCSE biomolecules (pre food tests)

Which elements are common to ALL biomolecules? (select ALL that apply!)

• Carbon

• Hydrogen

• Oxygen

• Nitrogen

• Sulphur

Answer explanation

Nitrogen is found in DNA and Proteins but not other biomolecules. Most large proteins also contain some sulphur.

Which elements may be present in proteins, but not in carbohydrates and fats? (select ALL that apply!)

• Carbon

• Hydrogen

• Oxygen

• Sulphur

• Nitrogen

Answer explanation

Carbon, hydrogen and oxygen are found in all majour groups of biological molecules (carbohydrates, lipids, proteins and DNA)

Large, complex, carbohydrates are made of simple molecules known as...

• glycerol

• amino acids

• fatty acids

• sugars

Large protein molecules are made of small subunits called...

• glucose

• fatty acids

• glycerol

• amino acids

What elements are amino acids made from?

• CHO

• CHON

• CHONP

• Something else

Answer explanation

Amino acids are the monomers that make up proteins so they contain the same elements that proteins do: C, H, O and N. Some (but not all aminoacids also contain sulphur)

What elements are glycerol and fatty acids made from?

• CHO

• CHON

• CHONP

• Something else

Answer explanation

Proteins contain N and DNA contains N and P. Carbohydrates and lipids only contain C, H and O.

Lipid molecules are made of smaller molecules called...

• Glucose and amino acids

• Glycerol and fatty acids

• Glucose and fatty acids

• Glycogen and fatty acids

Simple sugars contain which elements?

• CHO

• CHON

• CHONP

• Something else

Cellulose is a complex carbohydrate made of glucose monomers. In which part of a cell would you find it?

• Cell membrane

• Nucleus

• Cell wall

• Chloroplast

If polymer is the general word for large molecules made up of smaller pieces, what word is the general term used for the smaller pieces?

• monomer

• solomer

• minimer

• micromer