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Focus on Proteins
For Mad House
outline of the cell theory
All organisms are composed of one or more cells.
Cells are the smallest units of life.
All cells come from pre- existing cells.
Evidence of the Cell theory
comes from the research and work of many other scientists.
was an English natural philosopher.
1st observed cork cells in 1665 with a microscope he built himself.
NOTE: Robert Hooke did not invent the microscope, he just improved it.*
Matthias Jakob Schleiden:
was a German botanist
Through his observations, he stated that different parts of plants are composed of cells.
Antonie Van Leevwenhoek:
Observed singular cellular organisms.
- he called the "animalcules" meaning "little animals"
An early 1800 German scientist, specifically a zoologist.
Through his observations, he stated that animals are also made up of many cells.
1860's French chemist & microbiologist.
Debunked the 'spontaneous generation' idea.
Stated that "living things come from living things".
Unicellular organisms carry out all the functions of life. (Metabolism, response, homeostatis, growth, reproduction, nutrition.)
Compared relitive sizes of molecules, cell membrane thickness, viruses, bacteria, orgenells, and cells, in the appropriate SI unit.
Molecules (1 nm)
Cell membrane thickness (10 nm)
Viruses (100 nm)
Bacteria (1 µm)
Organelles (less than 10 µm)
Most cells (less than 100 µm)
Calculating the linear magnification of drawings and the actual size of specimens in images of known magnification:
Magnification = Measured Size of Diagram ÷ Actual Size of Object
Chris Bland work
Diagram of liver cell
Diagram of e.coli
Eukaryotic vs. Prokaryotic cells
are a group of organisms that lack a cell nucleus, or any other membrane-bound organelles.
Most are unicellular, but a few prokaryotes such as myxobacteria have multicellular stages in their life cycles.[[#cite_note-0|]
A distinction between prokaryotes and eukaryotes (is that eukaryotes do have "true" nuclei containing their DNA, whereas the genetic material in prokaryotes is not membrane-bound. Eukaryotic organisms may be unicellular, as in amoebae, or multicellular, as in plants and humans. The difference between the structure of prokaryotes and eukaryotes is so great that it is sometimes considered to be the most important distinction among groups of organisms
Three differences between plant and animal cells
three things that are in plant cells but not animal cells
A large central vacuole, a water-filled volume enclosed by a membrane known as the
maintains the cell's turgor, controls movement of molecules between the cytosol and sap, stores useful material and digests waste proteins and organelles.
A cell wall composed of cellulose and hemicellulose, pectin and in many cases lignin, and secreted by the protoplast on the outside of the cell membrane. This contrasts with the cell walls of fungi (which are made of chitin), and of bacteria, which are made of peptidoglycan.
Unlike animal cells, plant cells are stationary.
two roles of extracellular components.
the making and developing of plant cell wall and glycoproteins
Structure of membranes
Hydrophilic molecules and hydrophobic molecules form a double layer with the hydrophilic heads on the outside of the membrane while the hydrophobic tails are in the inside of the membrane. The heads are attracted to the water around making the membrane stable.
Membrane proteins functions:
pumps for active transport
has hormone binding sites
are electron carriers
have the channels for passive transport
enzymes catalyze reactions
is the movement of particles between different concentration gradients across the protein membrane
the movement of water across the permeable membrane; passive transport
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