Biology · Cell: The Unit of Life · NEET
The CIS face is the convex (outward-curved) forming face. It lies near the ER and RECEIVES material. Vesicles from the ER fuse with the cis face. The TRANS face is the concave (inward-curved) maturing face. It is where finished, modified material is RELEASED as vesicles. So material moves cis to trans: it comes in at cis and goes out at trans. NEET tip: cis = convex = forming, trans = concave = maturing.
The CIS face (also called the forming face) receives them. NCERT says clearly: 'Materials to be packaged in the form of vesicles from the ER fuse with the cis face of the golgi apparatus.' After modification inside the cisternae, the material is released from the trans face. This exact fact was tested as an Assertion-Reason question in NEET 2025, so remember the direction: ER to cis to trans to outside.
Cisternae are the flat, disc-shaped sacs that make up the Golgi apparatus. Each one is about 0.5 to 1.0 micrometre in diameter. They are stacked parallel to each other near the nucleus. NEET loves matching questions where 'cisternae = disc-shaped sacs of Golgi apparatus.' Do not confuse them with cristae (infoldings in mitochondria) or thylakoids (flat sacs in chloroplast).
In the Golgi apparatus. NCERT states plainly: 'Golgi apparatus is the important site of formation of glycoproteins and glycolipids.' Proteins made by ribosomes on the ER are sent to the Golgi, where sugar groups are added to form glycoproteins and glycolipids. This is one of the most repeated NEET facts (asked in 2019, 2020, 2024).
Yes. The endomembrane system includes the endoplasmic reticulum (ER), Golgi complex, lysosomes and vacuoles, because their functions are coordinated. Mitochondria, chloroplasts and peroxisomes are NOT included because their functions are not coordinated with these. NEET has asked this in 2021, 2023 and ReNEET 2026, so memorise the four members: ER, Golgi, lysosomes, vacuoles.
Yes. Lysosomes are membrane-bound vesicles formed by the process of packaging in the Golgi apparatus. A very common NEET trap says lysosomes are formed in the endoplasmic reticulum, which is WRONG. Remember: RER makes and folds proteins, but the Golgi packages them and buds off lysosomes rich in hydrolytic enzymes.
Camillo Golgi first observed it in 1898 as densely stained reticular (net-like) structures near the nucleus. They were later named Golgi bodies after him. Other names used in NCERT and NEET are Golgi complex and Golgi apparatus (all mean the same thing). In plant cells the units are also called dictyosomes.
Assertion (A): The primary function of the Golgi apparatus is to package the materials made by the endoplasmic reticulum and deliver it to intracellular targets and outside the cell. Reason (R): Vesicles containing materials made by the endoplasmic reticulum fuse with the cis face of the Golgi apparatus, and they are modified and released from the trans face of the Golgi apparatus.
Which of the following statements are correct with respect to Golgi apparatus? (A) It is the important site of formation of glycoprotein and glycolipids. (B) It produces cellular energy in the form of ATP. (C) It modifies the protein synthesized by ribosomes on ER. (D) It facilitates the transport of ions. (E) It provides mechanical support.
The Golgi complex participates in
Try the real previous-year questions from this chapter — each with the answer and a full solution.
Its main function is packaging: it packs materials made by the ER into vesicles and delivers them to targets inside the cell or secretes them outside. It also modifies proteins from the ER and is the site of formation of glycoproteins and glycolipids. It also forms lysosomes.
The cis (forming) face is convex and receives material from the ER. The trans (maturing) face is concave and releases the finished vesicles. Memory: Cis = Convex = Comes in; tranS = concave = Sends out.
Secretory cells (like gland cells) export a lot of product. The Golgi packages material into secretory vesicles for release outside the cell, so these cells contain a high number of Golgi complexes to handle the heavy packaging and export workload. NEET 2019 tested this.
No. NCERT notes that the cis and trans faces of the organelle are entirely different but interconnected only through the flow of material - vesicles move material across the stack from the cis face to the trans face. They are not two ends of the same continuous tube.
Cisternae are the flat disc-shaped sacs of the Golgi apparatus. Cristae are the infoldings of the inner mitochondrial membrane. Thylakoids are the flat membranous sacs in the stroma of the chloroplast. NEET repeatedly mixes these three in matching questions.
