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Science Quiz #4 Term

Cell Transport and Elimination

What is passive transport? without energy
What is active transport? requires energy
Some substances... can cross the cell membrane without any energy by the cell
Help organisms... maintain homeostasis by controlling what substances may enter or leave cells
To stay alive... a cell must exchange materials such as food, water, & wastes with its environment
The Cell Membrane is semi-permeable or selectively permeable... it only allows certain molecules to pass through
Small molecules like water,oxygen,carbon monoxide and amino acids... can move in and out freely
Large molecules like proteins, ions,and... carbohydrates cannot
Diffusion... is the movement of molecules from an area of higher concentration to an area of lower concentration
Created by: KeyLime1600