What are subcellular features?
These compartments can be organelles, specific structures that take on sets of tasks within the cell, or they can be local regions of the cell defined by the concentration of molecules or distinct physical characteristics and proportions. Subcellular compartments are key to the way we organize the domains of life.
What characteristics features are common to or shared by both mitochondria and chloroplast?
Even though both organelles are found in eukaryotic cells, both mitochondria and chloroplast have characteristics often found in prokaryotic cells. These prokaryotic cell characteristics include: an enclosed double membrane, circular DNA, and bacteria-like ribosomes.
What are the main functions of the cell membrane and the cell wall?
Difference between Cell Wall and Cell Membrane
|CELL WALL||CELL MEMBRANE|
|Functions include protection from the external environment.||Functions include permeability, signal reception, motility conduction, cell division, sexual reproduction, etc.|
How are the structure and function of subcellular components and their interactions important to cellular processes?
The structure and function of subcellular components, and their interactions, provide essential cellular processes. In a sequential manner, these cellular components interact to become the site of protein synthesis where the translation of the genetic instructions yields specific polypeptides.
What type of cells have internal membranes?
All cells have an outer plasma membrane that regulates not only what enters the cell, but also how much of any given substance comes in. Unlike prokaryotes, eukaryotic cells also possess internal membranes that encase their organelles and control the exchange of essential cell components.
What is the main function of the chromosomes in an animal cell?
The chromosome holds not only the genetic code, but many of the proteins responsible for helping express it. Its complex form and structure dictate how often genes can be translated into proteins, and which genes are translated. This process is known as gene expression and is responsible for creating organisms.
What 3 things does the cell membrane do?
Biological membranes have three primary functions: (1) they keep toxic substances out of the cell; (2) they contain receptors and channels that allow specific molecules, such as ions, nutrients, wastes, and metabolic products, that mediate cellular and extracellular activities to pass between organelles and between the …
Why do cells have membranes?
Cell membranes serve as barriers and gatekeepers. They are semi-permeable, which means that some molecules can diffuse across the lipid bilayer but others cannot. Specialized proteins in the cell membrane regulate the concentration of specific molecules inside the cell.
What is meant by the cell membrane is semipermeable?
The cell membrane is semipermeable, or selectively permeable, which means that only some molecules can pass through the membrane. If the cell membrane were completely permeable, the inside of the cell would be the same as the outside of the cell.
Why is the plasma membrane so important to cells and to life in general?
The plasma membrane is the most essential component of a cell because it encases and protects the complex chemistry of life inside the cell. A selectively permeable membrane allows only certain substances to enter the cell. This is important in keeping necessary nutrients in and keeping unwanted substances out.
What is the composition of cell membrane?
Cell membranes are composed primarily of fatty-acid-based lipids and proteins. Membrane lipids are principally of two types, phospholipids and sterols (generally cholesterol).
What does the Golgi apparatus do simple?
The Golgi apparatus gathers simple molecules and combines them to make molecules that are more complex. It then takes those big molecules, packages them in vesicles, and either stores them for later use or sends them out of the cell. It is also the organelle that builds lysosomes (cell digestion machines).
What is the function of Golgi apparatus in the cell?
A Golgi body, also known as a Golgi apparatus, is a cell organelle that helps process and package proteins and lipid molecules, especially proteins destined to be exported from the cell. Named after its discoverer, Camillo Golgi, the Golgi body appears as a series of stacked membranes.