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B3a Molecules of Life

1. Nucleus carries genetic information.
Cell membrane controls the movement of substances in and out of cells.
Cytoplasm is where many chemical reactions happen.
Respiration occurs in the mitochondria providing energy for life processes.

2. Label these parts on the animal cell
diagram:

Cell membrane /…

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4. Genes are made of DNA.
(i) The diagram shows DNA replication (copying).











Complete the diagram to show the bases in the new DNA strands
(ii) describe the stage is involved in the production of human insulin, by genetically
modified bacteria
Human gene that produces insulin is removed
This gene…

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