cells pages 1-3 on notes Flashcards
Theories on the Origin of Cells
Hypotheses.
Since there is NOT enough evidence to create theory.
Origins of Organic Molecules
Panspermia: meteorites carrying organic molecules brought them to Earth.
Example sentence: Some scientists believe that panspermia is a possible explanation for the origins of organic molecules on Earth.
Origins of Prokaryotic Cells
Iron sulfide: hot iron sulfide coo led by the ocean water as it rose free.
Example sentence: Iron sulfide is one of the proposed origins of prokaryotic cells.
Hydrothermal Vents
Molecules coming out om hypothermal vents.
Example sentence: Hydrothermal vents are known for releasing various molecules into the ocean.
Pores in Earth and geothe
Pores formed in the bottom of the t exist in rmal energy created cooling process, which e bottom of the t organic molecules and acted like a cell membrane with selective res.
Example sentence: The pores formed in the Earth’s geothermal energy process may have played a role in the origins of cells.
Tidal pools
Gases in Earth’s atmosphere and energy from enclosed, spheres when lighthing and Uv radiat placed in water why??
Example sentence: Tidal pools are believed to have provided the conditions necessary for the formation of early cells.
Origin of Eukaryotic Cells
Endosymbiont Theory
A theory to determine how eukaryotic organisms arose, mainly concerns mitochondria and chloroplasts.
Average Size of Cells - Include Units
eu = do!
Eukaryotic
pro = no!
Prokaryotic
Viral
What is the Cell Membrane?
structure that is the outer covering of the cell
regulates what enters and exits
What is Cytoplasm?
gel-like substance that houses organelles of a cell
(Cytosol)
What is Genetic material?
DNA, RNA does the dirty work. Directs cell activities and used for reproduction!
RNA NOT membrane bound
What are Ribosomes?
assembles/ synthesizes proteins
NOT an organelle store the components
What are the characteristics of all cells?
- Cell Membrane: structure that is the outer covering of the cell
- Cytoplasm: gel-like substance that houses organelles of a cell
- Genetic material: DNA, RNA does the dirty work. Directs cell activities and used for reproduction!
- Ribosomes: assembles/ synthesizes proteins
RNA NOT membrane bound
What is the Cell Theory?
Part 1: All living things are composed of cells.
Part 2: Cells are the basic units of structure and function in living things.
Part 3: All cells come from pre-existing cells.
Hooke
he started it off.. hook!.
used primitive light microscopes to look at slices of cork
Leeuwenhoek
He saw thousands of tiny chambers that he called Ow went hook
observed microscopic organisms in a drop of pond
Schleiden
almost I twins…
proposed that all plants are made of cells
Schwann
Caswan !
proposed that all animals are made of cells
Virchow
virchous viryow virgeah!
proposed that all cells came from pre-existing cells
Flagella
used for transport. only prokaryotic organism BACTERIA.
Genetic material: DNA
Typical Prokaryotic Cell - PRO = NO! PRO has NO nucleus nor organelles! THINK.
ribosomes, cytoplasm, cell membrane, cell wall, reproduction
Eukaryotes
- Simple structure. - No nucleominent - Small size. - Small ribosomes. - Unicellular: - No organelles - Contain DNA. Contain ribosomes. contain Sw. Have a cell membrane. complex structure. - Prominent nucleus. - Large size. - Large ribosomes. Multi or Unicellular. Membrane Bound organelles. - Human, plants, fungi, and protists.
