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Cell Membranes
Q) Explain how the function of membranes relate to form. ... Membranes are thin structures, measuring 8 micrometer thick with a semi-permeable structure. membranes have a dual function:
(1) they separate and keep toxic substances out of the cell and act as a barrier
(2) they allow specific nutrients, wastes, and products to pass between organelles and between the cell and the outside environment
The cell membrane in made of a double phospholipid bilayer witch contains various cholesterol, phospholipids, glycolipids and proteins. ... Also cholesterol serves diverse functions such as: (1)it is converted to vitamin D (if irradiated with Ultra Violet light) (2)modified to form steroid hormones (3)is modified to bile acids to digest fats
Phospholipids are made up of a hydrophilic head (polar) and a hydrophobic tail (non-polar). ... This means membranes are not static they are always changing. ...
Phospholipids
The membranes of cells are a fluid, they are semi-permeable, which means some things can pass through the membrane through osmosis or diffusion. ... Some proteins in the plasma membrane form open pores, called membrane channels, which allow the free diffusion of ions into and out of the cell. ...
Membranes can also help the chemical reactions which happen in the cell, this is because they hold chemicals for reactions so they become a ‘work surface’ where the reactions happen. ... The nucleus membrane is an extension of the membrane of the endoplasmic reticulum, which synthesizes the lipids for all cell membranes. ...
Lysosome
Mitochondria are the cells power sources, they are distinct organelles with two membranes. ... The thylakoid membranes are the site of the photosynthetic light reactions. ... The chloroplast is made of fat (lipid) and protein membranes all folded-around in a complicated way.
Approximate Word count = 1573
Approximate Pages = 6.3
(250 words per page double spaced)
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