BIOLOGY

Reviewed by GL: And your sources of information? **

__**THIRD TERM**__

Cofactors : inorganic complement of an enzyme reaction, usually a metal ions. Propertie of cofactor... -Proteins Examples. -Iron -Cooper or Magnesium

Enzymes : a protein produced within an organism, capable of acelerating a particular chemical reaction ; a type of catalyst. Propertie of enzymes...

-RNA -Substrates

Examples: Maltose polypeptides Ribozymes : molecules have come to be known as ribozymes. Properties... -RNA -proteins Examples: E. Coli cell Vitamins: One of a class of organic substances contributing to the formation or action of cellular enzymes, syntesized by plants , but animals cannot manufacture many vitamins, and these must be supplied prefabricated in food. Properties... - Nutrients Examples - vitamin a, b , c

SECOND TERM

Production and Intracellular transport...

__Prokayotes__: is the simplest living cell; are more complicated than just a lipid membrane and some DNA. Prokayotes have both DNA and RNA inside the cell wall or membrane.



Eukaryotics: Eukaryotic cells have an **organized nucleus** with a **nuclear envelope**. They have a "brain" for the cell. They have a discreet area where they keep their DNA.Eukaryotic cells usually have **organelles**. They might have mitochondria, maybe a **chloroplast**, or some endoplasmic reticulum. They have parts that work to make the cell a self-sufficient organism. Eukaryotic cells have extra stuff going on and extra parts attached. Since they have organelles and organized DNA they are able to create parts. One example is the **flagellum** (a tail-like structure to help it move).



OPCIONAL ASIGMENT (:

The Birth of Complex cells ( Prokayotes and Eukaryotes )

Prokayotes cells are unicellular organisms found in the enviroment the don't have cell membrane, prokayotes are the first organisms that for billions of years were the only form of life. Some bacterias that are prokayotes are : Staphylococcus Escherichia Coli Streptococcus

Eukaryotes cells they have more than one cell so, they are multicellular organisms. A good examples of eukaryotes organisms are : Paramecium Dinoflagellates Sapiens Green plants (algae and land plants )

Brenda Belevan Grade 8 Milton