IP5 Exam Review (25/09)

What are the basic units of DNA called?

• Cells

• Nucleotides

• Proteins

• Chromosomes

What do the phosphate groups and sugar molecules make up in a DNA molecule?

• The steps of the ladder

• The sides of the ladder

• The bases

• The genes

What is a mutation?

• An error during DNA replication

• A new protein

• A type of cell

• Normal copying

What is asexual reproduction?

• Production of offspring from one parent

• Joining of male and female gametes

• Breeding for traits

• Copying proteins

What is selective breeding?

• Breeding for desirable traits

• Asexual reproduction

• Mutations in genes

• Protein synthesis

What is an organism with two different genes for a trait called?

• Purebred

• Recessive

• Hybrid

• Dominant

What organism is responsible for nitrogen fixation?

• Fungi

• Bacteria

• None of the above

• Both (a) & (b)

What is released during photosynthesis in the carbon cycle?

• Carbon dioxide

• Water

• Oxygen

• Nitrogen

What type of organism makes its own food?

• Autotroph

• Heterotroph

• Detritivore

• Scavenger

Why is phosphorus important for DNA?

• It helps form the DNA molecule's structure

• It produces energy for cells

• It carries oxygen to plants

• It fixes nitrogen in the soil