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

The outer membrane contains porins
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

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

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

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Plant Structure
Which is not true about a photon?

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

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