Science cells

• Cells are very small in size
• in 1665, Robert Hooke observed very thin slices of cork under a microscope
• Cellula a latin word that means "small rooms"
• Robert Hooke published his book called micrographia
• Theodor Schwann extended this idea to animals as well
• in1839 Theodore Schwannhe studied the animal tissues.
• in 1855 ruldph virchowo bserved that cells comes from preexisting cells
• the cell thoery states

  1.cells is the basic unit of life 2.all organism's consist if one or more cells 3.cells come from preexisting cells
• eukaryotic cells these are bigger cells than prokaryotic cells
• the word karyon means kernel
• Eu means true
• a prokaryote has its dna scattered in the region known as the nucleiod region
• Prokaryotes have circular DNA and Cells walls
• eukaryotes have linear DNA, plant and fungus cells have walls cells in it
• DORA means

  D-DNA

  O-ORGANELLES

  R-REPRODUCTION

  A-AVEGRAGE SIZE
• cell membrane it controls what passes in and out of the cell. this part present in both animals and plants cells
• Cell walls this part plays a role in maintaining the shape of the cell and preventing it from excessive water uptake
• flagella and cilia these are structures that hep animal cells
• cytoplasm this is a gel like matrix where all the organelles are suspended within the cell
• Nucleus the genetic material can be found
• nuclear membrane it envelopes te nucleus and separate its contents from the cytoplasm
• Ribososmes these are the organelles responsible for synthesizing proteins
• centrioles these small,paired clyndrical structures are found near the nucleus
• smooth er the one without ribososmes
• rough ER the with ribososmes
• golgi bodies they modify and process proteins
• lysosomes plays a role in breaking down old organelles
• mitochondrion it is the powerhouse of the cell. it is the site where energy in the form of adenodine is made
• vacuole it stored food and water
• chloroplast plants manufacturers their own food
• Cell is the fundamental unit of life
• tissue is a group of similar cells that work together to carry out a certain functions
• organ systems is a composed of various organd that work together to carry oit related bodily functions
• organism various functions work together to form
• Population is a group of organism of the same species
• Community is a collection of populations living within a certain area
• Ecosystem water,air and soil to the living things
• biotic factors whereas livinh the components of the ecosystem
• biosphereit is the sum of all ecosystem on the planet