All living things are made up of tiny structures called cells. Cells are the basic building blocks of all living organisms.
Some organisms (living things) are made up of just one cell. These are called unicellular organisms.
Examples of unicellular organisms include:
Unicellular organisms are organisms made up of a single cell. Examples include bacteria, some types of algae, some types of fungi and amoebas. (Algae image: CSIRO on Wikimedia Commons; Fungi image: Ran Yuping et al. on Wikimedia Commons; Amoeba image: SmallRex on Wikimedia Commons)
Other organisms are made up of multiple cells. These are called multicellular organisms.
Examples of multicellular organisms include:
Multicellular organisms are organisms made up of multiple cells. Examples include plants, animals, some species of fungi and some species of algae.
Within each cell there are many small structures. These are called sub-cellular structures. Each sub-cellular structure has its own specific function.
Examples of sub-cellular structures include the nucleus, the cell membrane and ribosomes. The functions of these and other sub-cellular structures will be explored later in the course.
Diagram of an animal cell, with its sub-cellular structures labelled.
Onion cells viewed through a microscope. Each cell's nucleus and cell wall are visible (note: the cells have been stained to make these structures visible). Image adapted from 'Onion skin cells under a microscope' by Katekor1 on Wikimedia Commons
Flashcards help you memorise information quickly. Copy each question onto its own flashcard and then write the answer on the other side. Testing yourself on these regularly will enable you to learn much more quickly than just reading and making notes.
What are cells?
What are organisms that are made up of one cell called?
What are organisms that are made up of multiple cells called?
What are sub-cellular structures?
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