Flashcards in Maciej Chapter 1 Maciej Deck (12):
How do you find image size?
Magnification x Actual size
Name what is in an animal cell
Name what is in a plant cell
Single cell organisms (e.g. Bacteria)
Do not have nucleus
Approx length: 0.2-2um
Approx length 10um-100um
Membrane bound organelles
Net random movement of particles from an area of high concentration to low concentration
What affects rate of diffusion ?
Surface area to volume ratio
Net random movement of water molecules from high water potential to low water potential across a potentially permeable membrane
Movement if particles against the concentration gradient
Summarise the development of the microscope and how it helped us understand sub-cellular structure
-The light microscopes used a beam of light to magnify around 2000 times with a resolution of 200nm
-The invention of electron microscopes meant that biologists could magnify objects about 2,000,000 times with a resolution of 0.2nm
What is the nucleus made up of in a cell ?
Nucleus contains chromosomes made of DNA molecules, each contains a large number of genes