Chapter 2, Problem 1CYU

What are the three general regions of a cell?

Summary Introduction

To review:

The three general regions of a cell.

Introduction:

The smallest living unit of the body is known as cell. In order to sustain life, each cell performs a necessary function. The functions of cells are carried out by various subunits of the cell. These subunits are known as organelles. The examples of organelles include ribosomes, lysosomes, mitochondria and so on.

Explanation of Solution

The three major regions of the cell are plasma membrane, cytoplasm, and nucleus. The plasma membrane is also referred to as an outer boundary of the cell. It is a double membrane layer of lipids that are embedded with protein. It functions as an external cell barrier and helps in transporting only specific substances in and out of the cell.

The cytoplasm is known as a cellular region that is present between the plasma membrane and nuclear membrane. It comprises of fluid cytosol that contains organelles, inclusions, and dissolved solutes. The cytoplasm surrounds the nucleus and makes up the bulk portion of the cell. The functions of the cytoplasm include providing shape to the cell and keeping the organelles in their position.

The nucleus is known to be surrounded by a nuclear envelope. It comprises of chromatin, fluid nucleoplasm, and nuclei. It is responsible for controlling the activities of the cell. The genetic content is present inside the nucleus. Only eukaryotic cells possess a nucleus. This cellular structure also provides instructions in order to mediate the protein synthesis.