cells : principles and applications of science
- cell membrane - controls what moves in and out of the cell
- mitochondria - where aerobic respiration takes place
- cytoplasm - where most of the chemical reactions take place
- nucleus - contains genetic information
- nuclear membrane - movement of particles in and out of the cell
- starch grains - stores starch
Microscopes : history
- first names in 1609
- first cells observed in 1665 which were cork plant cells (dead)
- first living cells observed around 1674 - 1683 (living cells)
- nucleus first observed in 1831
- universal cell theory 1839
- evidence for new cells generated from existing cells in 1892
how compound light microscopes work
- it has two lens,objective and eyepiece
- the objective lens is placed closed to the specimen
- the eyepiece is the lens through which specimen is viewed
- both lens magnify the same
- calculations
eye piece = x10 or x20
objective lens = x4,x10,x40,x100
%%[formula = eye piece x objective]%% ⭐
- a transition light microscope forms an image from the light passing through the specimen
- specimen must be thin
- magnification
- %%[magnification = measured size of the image / actual size of the object]%%⭐
Characters of living things
- growth
- reproduction
- releases energy
- nutrition
- excretion
- sensitivity
- movement
- made up of cells
principles of living organisms
- cells and tissues
- types of tissues
- structures found within cells
- function of structures found within cells
- difference between type of cell
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