Golgi Apparatus: Study Notes

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Golgi Apparatus

The Golgi apparatus are tubular system with sacs and it has a parallel arranged, flattened membrane bound vesicles which lack ribosomes.

Location:

They are typically located near the nucleus membrane.

Quantity:

The number of golgi bodies in a cell may be very large; usually it varies from 3-15 per cell. It is absent in bacteria and RBCs of mammals.

Golgi Apparatus/Golgi Complex Overview

Membrane:

- Single

Structure:

- Consists of smooth, flattened, membrane-bound, sac-like structures called cisternae, stacked in parallel rows

- Frequently surrounded by vesicles discharged from the cisternae

- Cisternae are curved to give polarity:

- Forming or cis face (convex) receives vesicles

- Maturing face or trans face (concave) where vesicles leave

- In plant cells, composed of separate units called dictyosomes

Functions:

- Involved in the synthesis and repair of cell membranes

- Formation of lysosomes and peroxisomes

- Cell wall secretion

- Major function is secretion

- Participates in storage, modification, and packaging of various biochemical products

- Works with smooth ER to modify proteins for export by the cell

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