Biology > QUESTIONS & ANSWERS > Y9-Exam-Revision-Booklet (All)

Y9-Exam-Revision-Booklet

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Biology Cells An animal cell has:  Nucleus. This controls what the cell does.  Cytoplasm. This is a sort of jelly that fills the cell. It is where most chemical reactions in the cell happen ... .  Cell membrane. This is a thin skin around the cell. It holds the cell together and controls what goes in and out.  Mitochondria. These are where aerobic respiration happens. Plant cells also have:  Cell wall: This is a stiff outer layer around the cell membrane. It supports the cell.  Vacuole: This is filled with cell sap. Cell sap is a liquid containing sugar and salts.  Chloroplasts: These are where photosynthesis happens. Sperm cells  Sperm cells take the male DNA to the egg.  A sperm cell has a tail to help it swim to the egg.  It has a lot of mitochondria. These provide energy for swimming [Show More]

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