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OCR Biology A Paper 2
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Description of nucleus - Large organelle surrounded by a nuclear envelope which contains pores. the nucleus contains chromatin (which is made from DNA and proteins and a structure called the nucleolus. What is the function of nucleus ? - Controls the cells activities by controlling the transcription of DNA. DNA contains instructions to make proteins. Pores allow substances to move between the nucleus and cytoplasm. The nucleolus makes ribosomes Description of lysosome - A round organelle surrounded by a membrane with no clear internal structure What is the function of the lysozyme? - Contains digestive enzymes which are used to digest invading cells or break down worn components of the cel
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description of nucleus large organelle surrounded by a nuclear envelope which contains pores the nucleus contains chromatin which is made from dna and proteins and a structure called the nucleol
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