★ Must-know
📌 An open system exchanges both matter and energy with its surroundings, a closed system exchanges energy but not matter, and an isolated system exchanges neither matter nor energy.
Further detail
📌 Cells are structural units because all living things are made of cells, and functional units because they perform the processes needed to stay alive.
1. Which description identifies a cell as the basic unit of life?
2. A living cell takes in nutrients and oxygen, releases waste and heat, and uses energy. Which system classification fits these exchanges?
3. A molecule must pass through pores in the boundary surrounding the nucleus. Which structure directly regulates this movement?
What is the cell’s defining role in living organisms?
It is the smallest structural and functional unit of life.
What makes a cell the smallest structure capable of sustaining life?
It can carry out all processes necessary for life.
What does an open system exchange with its surroundings?
Both matter and energy.
Why are living cells open systems?
They exchange matter and energy with their surroundings.
What does the nucleus contain and regulate?
It contains DNA and regulates many cell activities.
What do ribosomes build?
Proteins.
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