Plant Structure
Which of the following observations is not used as evidence to support the concept of endosymbiotic origin of chloroplasts and mitochondria?

Both have their own DNA
Both have their own ribosomes
Both can live and function independently of the cell
Both strongly resemble prokaryotes, especially in size

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

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Plant Structure
Which of the following statements about the outer mitochondrial membrane is not true?

The outer membrane contains porins
The outer membrane is impermeable to hydrogen ions
The outer membrane is highly permeable to substances of small molecular weight
The outer membrane is about 50% lipid and 50% protein by weight

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