4. Describe the structure and cellular activity of each organelle: ribosomes, endoplasmic reticulum, Golgi apparatus, lysosomes, peroxisomes,...

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Medical Sciences

4. Describe the structure and cellular activity of eachorganelle: ribosomes, endoplasmic reticulum, Golgi apparatus,lysosomes, peroxisomes, mitochondria, cytoskeleton, centrosome, andcentrioles.
5. Explain the structure of glycosomes and lipid droplets.
6. Describe the role of each of the three parts of the nucleusin the control of cellular activities: the nuclear envelope, thenucleolus, and chromatin.
7. List the phases of the cell life cycle, and describe a keyevent of each phase.
8. Name specific cell types, and relate their overall shape totheir specific functions. 9. Compare theories of celldifferentiation and aging.

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Ans 4 Ribosome They are cellular organelles which consists of RNA and proteins and helps in synthesis of the proteins They helps in translating the mRNA into amino acid sequence to produce polypeptide It is a complex which is made of RNA and proteins and consists of two subunits The mRNA binds to the smaller subunit and the amino acid are added in the large subunit The ribosomes are made in the nucleolus and they are exported into the cytoplasm with help of nuclear pore They are basic organelles for the production and synthesis of proteins Endoplasmic Reticulum The ER is divided into rough ER and smooth ER The rough ER consists of ribosomes on its surface which give it the rough appearance It consists of interconnected network of cisternae which are flattened See Answer

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