Biology · Cell Structure and Function

The correct order of organelles in ultracentrifugation, based on their size and density, is as follows:

1. Nuclei

2. Mitochondria

Here's the explanation: Nuclei are the largest and heaviest organelles, so they sediment first. Mitochondria, while smaller than nuclei, are still quite dense, which is why they sediment next. Smaller and less dense organelles, such as ribosomes and Golgi bodies, sediment later at higher centrifugal forces.

This order is incorrect because ribosomes are the smallest and lightest organelles, so they sediment last, not first.

In ultracentrifugation, heavier organelles (like nuclei) settle first, followed by medium ones (like mitochondria), and finally smaller particles (like ribosomes).

This order is incorrect. Lysosomes and ribosomes are smaller than mitochondria and cannot sediment before them.

Mitochondria, being denser and larger, sediment earlier than both lysosomes and ribosomes.

This is the correct order in ultracentrifugation.

Nuclei are the largest and heaviest organelles, so they sediment first when centrifuged at low speed.

Mitochondria are smaller and less dense than nuclei but heavier than other organelles, so they sediment next at higher speed.

This represents the true sequential sedimentation order during cell fractionation.

This order is incorrect because mitochondria cannot sediment before nuclei.

Nuclei always sediment first due to their greater mass and density.

This order is completely wrong.

Ribosomes are the smallest, so they sediment last, not first.

Golgi bodies are also lighter than mitochondria and nuclei, so they come even later in the process.