Question

in your textbook, read about maintaining a balance.
use each of the terms below just once to complete the passage.
glucose plasma membrane homeostasis
organism balance selective permeability
living cells maintain a (1)______ by controlling materials that enter and leave. without this
ability, the cell cannot maintain (2)______ and will die. the cell must regulate internal con-
centrations of water, (3)______, and other nutrients and must eliminate waste products.
homeostasis in a cell is maintained by the (4)______, which allows only certain
particles to pass through and keeps other particles out. this property of a membrane is known as
(5)______. it allows different cells to carry on different activities within the
same (6)______.

Explanation:

• For (1), "balance" makes sense as cells control materials to maintain a state of equilibrium.
• For (2), "homeostasis" is the term for the stable internal environment cells need.
• For (3), "glucose" is a common nutrient cells regulate.
• For (4), the "plasma membrane" is the structure that controls what enters and leaves the cell.
• For (5), "selective permeability" describes the plasma membrane's property of allowing certain particles through.
• For (6), "organism" is the context where different cells with selective permeability can function.

Answer:

1. balance
2. homeostasis
3. glucose
4. plasma membrane
5. selective permeability
6. organism