Biology Test 2 Flashcards
(46 cards)
Robert Hook
Cell (Cork)
Antonie van Leeuwenhoek
Microscope
Schleiden and Schwann
All plants and animals have cells
Virchow
Cells come from Cells
Light Microscope
Used in the Laboratory highest is 1000x.
Transmission electron Microscope
Good internal detail
Scanning electron micrcsope
3d view with internal detail and can see chemicals.
Animal Gap Junction’s
Allow for rapid communications between animal cells with a tight seal.
Plant Junction/ Plasmodesmata
Allow for rapid communication between plant cells.
Plant cell
-Chloroplast/ photosynthesis
-Large central Vacuole/ storage
-Cell Wall
Animal Cell
Centrioles
Function
regulates the movement of materials in and out of the cell; communication between cells of tissues.
Diffusion
Movement of molecules from an high concentration to an area of lesser concentration (Ex. Lemon in water)
Osmosis
Diffusion of water through a selectively permeable membrane.
Isotonic
no net movement
Hypertonic
H2O moves out and cell shrinks causing less water outside and more solute outside the cell.
Hypotonic
H2O moves in and the Cell swells which causes less solute outside the cell.
Passive transport (Facilitated diffusion)
Molecules move with concentration gradient. No energy needed.
Active Transports
Molecules move against the concentration gradient requires energy (ATP) (Ex. Na+/K+ pump)
Endocytosis
Take in materials
Exocytosis
Exit of materials from the cell.
Phagocytosis
Food particle or larger molecule is taken by the cell (cellular Eating)
Energy
Capacity to or ability to perform work.
Kinetic energy
Motion
