THE TYPICAL CELL
A typical cell has three main parts: the cell membrane, cytoplasm, and nucleus.
What are the main parts of a typical cell?
The basic unit of life is the cell.
What is the basic unit of life?
he main role of the cell membrane is to control what enters and exits the cell, maintaining the internal environme
What is the main role of the cell membrane?
Bacteria sizes are usually described in micrometers
What unit is used to describe the size of bacteria?
The cell membrane controls the movement of substances in and out of the cell.
What is the role of the cell membrane in a typical cell?
The two main types of cells are prokaryotic cells (without a nucleus) and eukaryotic cells (with a nucleus)
What are the two main types of cells?
The membrane acts as a barrier to keep harmful substances out and provide structural support to the cell.
How does the membrane protect the cell?
Molecules such as DNA are measured in nanometers
What unit is used to measure the size of molecules like DNA?
Cytoplasm is the gel-like substance inside the cell where organelles are suspended and many cellular activities occur.
What is cytoplasm?
The cell membrane controls what enters and exits the cell and protects the cell.
What is the function of the cell membrane?
Transport across the membrane includes passive transport (like diffusion and osmosis) and active transport, which requires energy.
What types of transport occur across the membrane?
The length of an organ is usually measured in centimeters (cm) or millimeters (mm), depending on the organ’s size.
What unit is used to measure the length of an organ in the human body?
The nucleus stores genetic information and controls the cell’s growth and activities.
What is the function of the nucleus?
The nucleus contains genetic material (DNA) and controls cell activities.
What is the role of the nucleus in a cell?
Membrane proteins act as receptors that detect and respond to signals like hormones and neurotransmitters.
How does the membrane help with cell communication?
The thickness of a human hair is commonly measured in micrometers
What unit is commonly used to measure the thickness of a human hair?
Are all cells the same size?
No, cell sizes vary widely depending on the type and function of the cell.
Mitochondria are known as the “powerhouses” of the cell because they produce energy through respiration.
What are mitochondria known for?
They help in cell recognition and adhesion, allowing cells to identify each other and form tissues.
What role do glycoproteins and glycolipids play on the membrane?
The unit of measurement used in describing cell size is called micrometers. It is equal to a thousandth of a millimeter.
What unit of measurement is used in describing cell size?