Plant Structure
Which of the following is not an electron carrier class in the electron transport chain?

Cytochromes
Iron - sulfur proteins
Flavoproteins
Cytochrome c oxidase

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

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

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