★ Must-know
The cell membrane is permeable to some substances but not others and controls the movement of substances into and out of the cell.
Mitochondria contain the enzymes for respiration and are where most energy is released during respiration.
Further detail
1. What is a plasmid in a bacterial cell?
2. Why are mitochondria essential for the energy needs of a eukaryotic cell?
3. Which combination of features enables a nerve cell to carry electrical impulses and pass them between cells?
What defines a eukaryotic cell's nucleus?
It contains DNA in large linear chromosomes.
Which cell types are eukaryotic?
Animal, plant, fungal, and protist cells.
What is the cytoplasm composed of?
A jelly-like material with dissolved nutrients, salts, and organelles.
What does the nucleus control in the cell?
The activities of the cell.
How does the cell membrane regulate substances?
It is permeable to some substances and controls their movement in and out.
What role do mitochondria play in respiration?
They contain enzymes and release most energy during respiration.
It covers the core concepts of Year 9 Cell Biology, organized by topic with the key definitions, explanations and takeaways, so it's easier to learn and remember.
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