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Science Quiz #4 Term
Cell Transport and Elimination
Question | Answer |
---|---|
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 |