How do you remember the prokaryotic and eukaryotic ribosomal subunits?

The correct answer highlights that eukaryotic ribosomal subunits are denoted by even numbers. Eukaryotic ribosomes are composed of a large (60S) and a small (40S) subunit, totaling a 80S ribosome. This naming convention stems from the sedimentation coefficients measured in Svedberg units (S), which relate to the size and density of the ribosomal components during ultracentrifugation. The distinction in naming is consistent across various eukaryotic organisms, making it easier to remember since both components start with even numbers.

In contrast, prokaryotic ribosomal subunits are represented by odd numbers—specifically, a large (50S) and a small (30S) subunit, forming a 70S ribosome. This further differentiates the two groups based on their ribosomal structure and helps solidify the understanding that eukaryotic ribosomal subunits start with even numbers, establishing a clear mnemonic device for students studying molecular biology.

The other options do not provide accurate or useful methods for remembering ribosomal subunit compositions. Focusing instead on the numerical and structural differences between prokaryotic and eukaryotic ribosomes aids in mastering this