Biology Flashcards
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It is the basic unit of structure and function in living things.
Cell
Order
Cell – Tissue – Organ – Organ System - Organism - Population – Community – Ecosystem – Biosphere
a Dutch eyeglass maker, invented the very first Microscope (instrument
used to magnify small objects)
Zacharias Janssen (1950)
saw a box-shaped
structure that he called CELL.
Robert Hooke (1665)
Cell came from the Latin word
“cellus”
means tiny rooms/jail
rooms (cell)
- Father of Microbiology
- observed what he called Animalcules now known as protozoa (protest) which differs from
bacteria since it has different shapes while bacteria have only 3 types of basic shapes.
Anton Van Leeuwenhoek
a German botanist stated that plants are made of cells.
Matthias Schleiden
a German physiologist, concludes that animals are also made up of cells.
Theodore Schwann
stated that cells come from pre-existing cells
Rudolf Virchow
cell
division splits cell into two daughter cells
“Omnis cellula e cellula”
The Cell Theory was proposed (also known as the cell postulates) during
the 19th Century
CELL THEORY
All things are made up of cells.
Cells are the basic unit of structure and function in an organism.
Cells come from pre-existing cells.
Cells carry genetic materials which is passed from cell to cell during cell division.
All cells are basically the same structure and chemical composition (4 major compositions: protein,
lipid/ fats, carbohydrates, and nucleic acids).
Energy flow (biochemical processes such as cellular respiration, photosynthesis, metabolism) occurs
within the cells.
- Little Organs;
- Specialized structures found within the cell which performs specific
functions vital to cellular life.
ORGANELLES
- “pro” (before) + “karyon” (kernel nut)
- Simple unicellular organism
- Do NOT have a NUCLEUS and membrane bound organelles.
- Their DNA is found in the nucleoid region.
- First organism that existed, fast to reproduce but short-lived.
PROKARYOTES
- “eu” (true) + “karyon” (kernel nut)
- Organism whose cell has a nucleus enclosed by a membrane.
- Other organelles are also bound by membranes.
EUKARYOTES