A CELL is the smallest unit that can carry on all the PROCESSES of life. Every LIVING thing is made up of ONE or more cells.
A living thing that is made up of ONE cell is called UNICELLULAR. A living thing that is made up of MORE than one cell is a MULTICELLULAR organism.
How many cells are there in a human body? Between 50 to 100 trillion depending on a person’s size!
How many bacterial cells are there in and on a human body? 182 species of bacteria colonize the average person's skin There are about 1,000,000 bacteria per square inch on human skin Saliva may contain up to 1,000,000,000 bacteria per milliliter We have more bacteria living in and on us than cells in our bodies! Only about 10% of the cells in our bodies are Human!
They have CRISTAE which make more surface area for cellular respiration to take place, and ATP is formed here. Cells that use a lot of energy like muscle cells have many mitochondria. Mitochondria have their own DNA.
Are the garbage men of the cell and contain DIGESTIVE enzymes that break down wastes.
Provide a frame for the cell called the CYTOSKELETON. They also help move things around in the cell.
Are used in MOVEMENT and extend out from the surface of the cell. Cilia are short and hairlike. They beat in WAVES. Flagella are long and whiplike, occur SINGLY or in pairs.
Directs the ACTIVITIES of the cell. It is surrounded by a NUCLEAR membrane that has holes in it where molecules can enter and EXIT.
The nucleus contains CHROMATIN, strands of DNA and proteins. When it condenses, it forms CHROMOSOMES, the genetic information of the cell. The NUCLEOLUS is a spherical body in the nucleus where ribosomes are made.
Plant cells differ from ANIMAL cells because they have a cell WALL that surrounds the cell MEMBRANE. This helps support and protect the cell. They also have sacs called VACUOLES and plastids which store food or pigments.
Contain a green pigment called CHLOROPHYLL that is used in photosynthesis.
Contain pigments like orange CAROTENES, and yellow XANTHOPHYLLS, and red pigments. They give plants their distinctive colors.
Store food such as STARCHES, proteins, and lipids. They are storage organs in potato TUBERS.