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Who discovered that the animal cells lacked cell wall ?


Theodore Schwann discovered that animal cells lacked cell wall and that cell wall was a unique characteristic of the plant cells. 
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What are energy transducers ?

Energy transducers are those organelles which can convert one form of energy into another form are called energy transducers e.g. chloroplasts, mitochondria etc.
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Who proposed the fluid mosaic model of plasma membrane and when ?

Nicholson and Singer in 1972.
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Describe the arrangement of  phospholipid layer of cell membrane ?

Lipids are arranged in bilayer. The  polar head of the lipid head towards the outer sides forming a hydrophillic layer. The non-polar heads face towards the inner side forming the hydrophobic layer. The arrangement ensures that the nonpolar tail is protected from the aqueous enviroment. Lipid components mainly consist of phosphoglycerides.

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What is cell culture ?

It is the technique of growing isolated cells in a sterile nutrient medium under controlled conditions.
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