Plant Structure
The mitochondria were known in the nineteenth century to be osmotically active on the basis of evidence that

mitochondria were derived from a symbiotic bacterium
the mitochondrial matrix is hypotonic to the cellular cytoplasm
the mitochondrial matrix is hypertonic to the cellular cytoplasm
mitochondria are surrounded by a semi permeable membrane

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Plant Structure
Which of the following statements about mitochondrial proteins is true?

All mitochondrial proteins are coded for and synthesized in the mitochondria
All mitochondrial proteins are imported from the cytoplasm
Some mitochondrial proteins are coded for and synthesized in the mitochondria and others
Mitochondrial proteins arise from other mitochondrial proteins

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