ch22 Flashcards
the units of structure and function of living things
Cells
the study of cells
Cytology
first person to discover cells; created cytology
Robert Hooke
states that all living things are composed of living things
Cell theory
the size of an organism depends primarily on the _____ of its cells, not the _____ of its cells
number; not size
living cells were regarded as simple bags of an amorphous gel or slime called ____
Protoplasm
info: Scientists now know that a cell is like a tiny, self-contained city
Scientists now know that a cell is like a tiny, self-contained city
Cells are __% water
70
Three parts of Eukaryotic Cells
Cell membrane
Cytoplasm
Nucleus
have a membrane-bound nucleus
Eukaryotes
separates cell from external environment
Cell membrane
lipid molecules that compose the cell membrane
Phospholipids
Machinery
semipermeable membrane
Ion pumps
Portals or gates
Receptors
