BIO Exam #2

2 layers of phospholipids (main) and various proteins

Selectively permeable

Surround all living cells and organize cell functions inside Eukaryotic cells

Catalyze reactions inside or outside the cell at the membrane surface

AC; connects the inside of the cell to the outside by attaching ECM to the cytoskeleton, responds to changes inside/outside the cell, and supports the cell

bind to signal molecules from other cells and relay message to inside of cell

A) Channel protein-always open and allow small molecules to move in and out of the cell B) Active transport proteins involved in active transport of specific molecules in and out of the cell

AC only; gap junctions, anchoring junctions, and tight junctions

Cell ID

Movement of molecules across a membrane from an area of high concentration to an area of low concentration (concentration gradient)

No Energy Required

2 Kinds Diffusion=O2/C)2 out Facilitated Diffusion=uses a channel protein, Aquaporins

Diffusion of water across a membrane

Hypertonic Solutions

Hypotonic Solutions

Isotonic Solutions

All cells have…

Animal cells do best in a…

Plant cells do best in a…

Water always goes from a…

Burst=

Shrink=

• Requires energy (ATP) • Requires an active transport protein • Moves molecules against the concentration gradient for LOW to HIGH

Moving large molecules…