There are 46 chromosomes in the human body cells or 23 pairs.
Stem cells
A stem cell is a cell that has not yet become a specialised cell and have the ability to become several types of cells.
Diffusion
Diffusion is the movement of particles from a high concentration to a low concentration.
Palisade Cell
Many tightly packed chloroplasts
All living organisms are made up of cells. They provide structure and carry out certain functions.
Eukaryotic Cells
Cells found in plants, animals, fungi and protists. They are 10-100 micrometers in size.
Prokaryotic Cells
Include bacteria and archaea. Are 0.1-5.0 micrometers in size.
Prokaryotic cells may have one or more small rings of DNA, which are called plasmids. These plasmids can replicate and move between cells so that genetic information can be shared.
Prokaryotic cells do NOT contain mitochondria or chloroplasts.
Why is diffusion through a cell membrane described as a ‘net movement‘?
Particles move in both directions across the membrane, but there’s an overall (net) movement from the side where they’re more concentrated to the side where they’re less concentrated.
