Which organelle consists of flattened stacks that modify and package proteins and lipids for intracellular or extracellular use?

Study for your anatomy test with Netter's Anatomy Practice Test. Utilize questions and illustrated guides to master human anatomy and ace your exam!

Multiple Choice

Which organelle consists of flattened stacks that modify and package proteins and lipids for intracellular or extracellular use?

Explanation:
The Golgi apparatus is the cell’s processing and shipping center for proteins and lipids. It consists of flattened membrane-bound sacs called cisternae that are organized in a stacked, polarized structure. Cargo arriving from the endoplasmic reticulum moves through the stack from the cis face to the trans face, where enzymes sequentially modify molecules (such as adding carbohydrate chains, sulfation, or phosphorylation) and then sort and package them into vesicles. These vesicles are directed to destinations inside the cell, like lysosomes, or to the plasma membrane for secretion, or to be incorporated into the membrane itself. The stacked arrangement and stepwise processing allow precise maturation and targeting of each molecule. In contrast, lysosomes, peroxisomes, and mitochondria have different primary roles and structures (degradation, oxidation/detox, and ATP production, respectively) and do not function as the flattened, sequential processing and packaging center described here.

The Golgi apparatus is the cell’s processing and shipping center for proteins and lipids. It consists of flattened membrane-bound sacs called cisternae that are organized in a stacked, polarized structure. Cargo arriving from the endoplasmic reticulum moves through the stack from the cis face to the trans face, where enzymes sequentially modify molecules (such as adding carbohydrate chains, sulfation, or phosphorylation) and then sort and package them into vesicles. These vesicles are directed to destinations inside the cell, like lysosomes, or to the plasma membrane for secretion, or to be incorporated into the membrane itself. The stacked arrangement and stepwise processing allow precise maturation and targeting of each molecule. In contrast, lysosomes, peroxisomes, and mitochondria have different primary roles and structures (degradation, oxidation/detox, and ATP production, respectively) and do not function as the flattened, sequential processing and packaging center described here.

More Multiple Choice Questions
Subscribe

Get the latest from Passetra

You can unsubscribe at any time. Read our privacy policy