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Biology IB organelles definitions (structures and functions)

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Describe the structure and function of Plasma membrane

Structure: Phospholipid bilayer embedded with proteins (not an organelle per se, but a vital structure) Function: Semi-permeable and selective barrier surrounding the cell

Describe the structure and function of the nucleas

Structure: Double membrane structure with pores; contains an inner region called a nucleolus. Function: Stores genetic material (DNA) as chromatin; nucleolus is site of ribosome assembly.

Describe the structure and function of centrosome

Structure: Microtubule organising centre (contains paired centrioles in animal cells but not plant cells) Function: Radiating microtubules form spindle fibres and contribute to cell division (mitosis / meiosis)

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Institution
Abacus College, Oxford
Study Unknown
Course
AQA Biology

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