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The ENDOPLASMIC RETICULUM serves important functions particularly in synthesis ,folding,modification and transport of proteins .  The GOLGI BODY plays key role in sorting many cells proteins and membrane constituents and in directing them to their proper destination. The MITOCHONDRIA produce energy necessary for cells survival and functioning . The RIBOSOMES assumes the role of bringing together amino acids to form proteins.

Explanation:

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the unequal cytoplasmic division that  results  in  one egg  and three polar bodies ensures that a fertilized  egg has  ample nutrients  forits journey  to  the uterus.

many other transport proteins, often called pumps, move materials against a concentration gradient. active transport drives molecules across a membrane from a region of lower concentration to a region of higher concentration. this process, shown in figure 5.1, uses transport proteins powered by chemi- cal energy.