QCE Biology Unit 2 Topic 2 Revision (C level)

An infectious disease is caused by:

• Genetic mutations

• Nutrient deficiency

• Pathogens such as bacteria or viruses

• Environmental changes

Non-infectious diseases cannot be:

• Caused by microorganisms

• Inherited genetically

• Triggered by poor diet

• Related to environmental factors

Which of the following is an infectious disease?

• Diabetes

• Influenza

• Asthma

• Cancer

A disease that can spread between individuals is described as:

• Congenital

• Communicable

• Inherited

• Chronic

Which statement best describes a non-infectious disease?

• It is spread by direct contact

• It can result from genetic or lifestyle factors

• It always involves a pathogen

• It can be treated with antibiotics

Prions are unusual infectious agents because they contain only:

• DNA

• RNA

• Protein

• Lipids

Viruses reproduce by:

• Dividing independently

• Using the host cell’s machinery

• Producing spores

• Forming mycelia

Bacteria are classified as:

• Multicellular eukaryotes

• Unicellular prokaryotes

• Acellular particles

• Complex eukaryotes

Fungi often cause disease by:

• Photosynthesising

• Releasing digestive enzymes and absorbing nutrients

• Using red blood cells for energy

• Living only in water

Protists differ from bacteria because they:

• Have membrane-bound organelles

• Lack a nucleus

• Are always multicellular

• Contain no DNA