2. Lysosomes They are membranous, vesicular organelles that are formed by Golgi apparatus and are then dispersed through out the cytoplasm of the cell. They provide an intracellular digestive system. Lysosomes contain hydrolytic enzymes.

4. Peroxisomes These are small membranous organelles resembling lysosomes. Differences from lysosomes:-  Formed by self-replication or budding off from SER.  Contain oxidase enzymes.

5. Secretory vesicles Almost all secretory substances are formed by the ER and GA. They are then released into cytoplasm in the form of storage vesicles called secretory vesicles or secretory granules.

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8.   Mitochondria are self replicative, membranous organelles, that synthesize high energy phosphate compounds (ATP).  They are also called “Power house” of cell. Mitochondria

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10.   Mitochondria are present in all areas of cytoplasm but are concentrated in those areas that are responsible for major share of energy metabolism.  Vary in size and shape, number.  Diameter few hundred nm to upto 1 mm.  Shape could be globular, elongated, branching, filamentous.

11.   Mitochondria are present in all areas of cytoplasm but are concentrated in those areas that are responsible for major share of energy metabolism.  Vary in size and shape, number.  Diameter few hundred nm to upto 1 mm.  Shape could be globular, elongated, branching, filamentous.

12.   Inner membrane is thrown into folds forming shelves and on them oxidative enzymes are attached.  Inner cavity is filled with matrix in which large amounts of dissolved enzymes are present.  Mitochondria contains DNA similar to one present in nucleus, it plays role in replication of mitochondria.  Some proteins are also synthesized in the mitochondria.

14.   The nucleus is the control centre of the cell.  It contains large amounts of DNA, which are genes.  Genes determine the characteristics of proteins of the cell and they also control reproduction. Nucleus

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16.   Also called nuclear envelope.  It is a bilayer membrane.  The outer membrane is continuous with the ER so that the space between the two are continuous with each other.  The nuclear membrane is penetrated by several thousand nuclear pores. Large complexes of proteins are attached on the edge of nuclear pores. Nuclear membrane

17.   Nucleus consists of one or more nucleoli.  Nucleoli is not bounded by membrane.  It is an accumulation of RNA and proteins.  Formation of nucleoli and ribosomes begins in the nucleus. Nucleoli and formation of Ribosomes

19.   Vaults are shaped like octagonal barrels.  They are hollow from inside.  They are considered to be cellular trucks involved in nucleus to cytoplasm transport.

20.   The complex protein network portion of cytosol that acts as the bone and muscle of the cell. This network has three elements 1.Microtubules 2.Micro filaments 3.Intermediate filaments Cytoskeleton

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