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
mitochondria were derived from a symbiotic bacterium
the mitochondrial matrix is hypertonic to the cellular cytoplasm

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

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

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

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

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Plant Structure
Which is not true about a photon?

It is a packet of light energy
It is trapped by photosynthetic unit
The shorter the wavelength, the greater the energy of the photons
It donates electron to reduce carbon dioxide to glucose

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