Non-Membranous Organelles Quiz

Study Notes

Ribosomes

Ribosomes are composed of two main components: a large subunit and a small subunit, which are made up of proteins and ribosomal RNA (rRNA).
The large subunit is responsible for peptide bond formation, while the small subunit reads messenger RNA (mRNA) sequences.

Functions of Ribosomes

Free ribosomes are responsible for synthesizing proteins that are used within the cell, such as enzymes, and are not attached to the endoplasmic reticulum (ER).
Bound ribosomes, on the other hand, are attached to the ER and synthesize proteins that are intended for secretion or insertion into membranes.

Cytoskeleton

The cytoskeleton is composed of three main components: microtubules, microfilaments, and intermediate filaments.
Microtubules are hollow tubes made up of tubulin proteins, providing structural support and shape to the cell.
Microfilaments are composed of actin proteins, involved in muscle contraction and cell migration.
Intermediate filaments are composed of various proteins, providing mechanical support and stability to the cell.

Forms of Ribosomes

There are two forms of ribosomes: free ribosomes and bound ribosomes.
Free ribosomes are found in the cytosol, while bound ribosomes are attached to the endoplasmic reticulum (ER).

Ribosomes and rER

When forming rough endoplasmic reticulum (rER), ribosomes are attached to the ER membrane, allowing for the synthesis of proteins that are then inserted into the ER lumen for further modification and transport.

Description

Test your knowledge on non-membranous organelles with this quiz. Explore the structure and function of ribosomes, their formation in the nucleolus, and their abundance in protein-forming cells. Delve into the microscopic details of these essential cellular components.