A membrane that allows some molecules to pass through but does not allow other molecules to pass through.
Semipermeable Membrane
Hans and Zaccharias Janssen invented the first one of these.
Microscope
The control center of the cell, contains DNA.
Nucleus
Movement of molecules through plasma membrane aided by a process that requires energy input.
Active transport
Observed protozoa in pond water by looking through a microscope and called them "animalcules".
van Leeuwenhoek
Gel like substance in which all of the organelles are found.
Cytoplasm
Random motion of molecules from area of high concentration to area of low concentration.
Diffusion
Robert Hooke observed these types of cells through a primitive microscope.
Cork cells
This organelle is responsible for modifying and packaging proteins for transport.
Golgi Apparatus
Diffusion of water through a semipermeable membrane from area of high water concentration to low water concentration.
Osmosis
Rudolf Virchow proposed in 1855 that all cells come from existing cells and completed this theory.
Cell Theory
Membrane sac holds water, food, or waste.
Vacuole
Process of a membrane proteins helping molecules to pass through a membrane.
Facilitated Diffusion
In 1859 this scientist used curved flasks to demonstrate that microorganisms cannot spontaneoulsy generate.
Pasteur
Called the powerhouse of the cell, this organelle generates energy in form of ATP.
Mitochondria