Unicellular Organisms – Year 7 (KS3)

What is a unicellular organism?

• An organism made of many specialized cells

• An organism made of just one cell that carries out all life processes

• An organism made only of plant cells

• An organism that cannot perform life processes

Which of these are examples of unicellular organisms? Select all that apply.

• E. coli

• Yeast

• Oak tree

• Salmonella

Which group contains unicellular fungi?

• Yeast

• Cyanobacteria

• Streptococcus

• Paramecium

Which protist causes malaria?

• Amoeba

• Chlamydomonas

• Plasmodium

• Euglena

Which protist can photosynthesise and move?

• Paramecium

• Euglena

• Amoeba

• Plasmodium

Bacterial cells contain structures similar to other cells. Which structures are included? Select all that apply.

• Cell membrane

• Cytoplasm

• Ribosomes

• Cell wall

Which structure is a small circle of genetic material in bacteria?

• Nucleus

• Plasmid

• Ribosome

• Mitochondrion

What is the function of the flagellum in bacteria?

• Protein synthesis

• Photosynthesis

• Movement

• DNA replication

Where is the DNA found in a bacterial cell?

• Inside a nucleus

• Free in the cytoplasm

• Inside mitochondria

• Only in plasmids

Which statements describe how unicellular organisms exchange with the environment? Select all that apply.

• Take in food, oxygen, and water

• Remove waste matter

• Build and maintain themselves

• Rely on multicellular tissues to exchange gases