Ch. 4 Flashcards
Structure that carries out a specialized metabolic function inside a cell
Organelle
A cells outermost membrane
Plasma membrane
Semi fluid substance enclosed by a cell’s plasma membrane, composed of water, sugar, ions, and proteins
Cytoplasm
Organelle with two membranes that hold a eukaryotic cells DNA
Nucleus
Neither bacteria or Achaeans have a membrane bound nucleus so they are called
Prokaryotes
Animal, plant, and protist cells have a membrane bound nucleus that houses their DNA so they are called
Eukaryotes
The _____ is one of the basics of biology
cell theory
Four generalizations that constitute the cell theory
- Every living organism consists of one or more cells
- A cell is the smaller unit of life, individually alive even as part of a multicelled organism
- All living cells come from division of preexiating cells
4: :
Membranes of most cells can be described as a _____ of lipids
Fluid mosaic
Make the bulk of a cell membrane
Phospholipids
A double layer of lipids in which the non polar tails of both layers are sandwiched between the polar heads
Lipid bilayer
All membranes have _____ that passively or actively assists specific ions or molecules across a membrane
Transport proteins
Membrane protein that helps cells stick together in animal tissues
Adhesion protein
Binds to a particular substance, such as a hormone or toxin, outside of the cell
Receptor protein
Tags a cell as belonging to self which means that foreign cells can be recognized
Recognition protein
