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Level 1

Features of human and animal cells


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Nucleus
Controls all the activities of the cell. Contains the genes on the chromosomes. They carry instructions for making new cells or new organisms.
Cytoplasm
A liquid gel in which most of the chemical reactions needed for life take place.
Cell membrane
Controls the passage of substances into and out of the cell through diffusion.
Mitochondria
Structures in the cytoplasm where oxygen is used and most of the energy is released during respiration.
Ribosomes
Where protein synthesis takes place. All the proteins needed in the cell are made here.