Cell Transport

A teacher sets up four lab stations, each with a different water solution and a semipermeable membrane, as shown. The large dots represent particles that cannot cross the semipermeable membrane, and the small dots are particles that can cross. Which lab station will have a net movement of particles from left to right?

• lab station 1

• lab station 2

• lab station 3

• lab station 4

A cell has a lower concentration of water than a soaking solution, as shown in the diagram. What will most likely happen to the cell when it is placed in the soaking solution, and why?

• The cell will shrink because it will release water into the soaking solution.

• The cell will burst because it will absorb water from the soaking solution.

• The cell will not change because it contains dissolved particles.

• The cell will not change because it is not harmed by the water.

Tags

NGSS.MS-LS1-1

NGSS.MS-LS1-2

Students are learning about the functions of different parts in cells. The students model a cell part with a screen that sorts large objects from small objects. When objects of different sizes are placed on the screen, the screen allows the smaller objects to pass through it but not the larger objects. Which of these cell functions is most likely being modeled?

• energy production by the mitochondria

• passive transport across the cell membrane

• photosynthesis inside the chloroplast

• mitosis in the nucleus

Tags

NGSS.MS-LS1-2

The movement of water from a high concentration to a low concentration is called

• diffusion

• osmosis

• facilitated diffusion

• active transport

Match the following vocabulary terms and definitions.

• Hypotonic

• Low concentration; the solution has less solutes than the cell, causing water to move into the cell and out of the solution.

• Isotonic

• High concentration; the solution has more solutes than the cell, causing water to move out of the cell and into the solution.

• Hypertonic

• Same concentration; the solution and cell have equal concentration of solutes (particles), so water moves equally between the cell and solution.

In this situation, where the solute is illustrated by red dots, predict if will WATER move into or out of the cell, and how that will affect the cell.

• Water will move into the cell and the cell will expand.

• Water will move into the cell and the cell will shrink.

• Water will move out of the cell and the cell will expand.

• Water will move out of the cell and the cell will shrink.

Tags

NGSS.MS-LS1-2

Examine the diagram and determine, based on the concentrations of salt, if salt will move into or out of the cell.

• into

• out of

Molecules move in and out of a cell by diffusion. The picture shows a cell and molecules both inside and outside the cell. How will the molecules in this illustration move as a result of diffusion?

• out of the cell

• into another cell

• to the external environment

• into the cell

Cells use energy to move materials across a membrane (low to high concentration).

• Active transport

• Passive transport

• Diffusion

• Osmosis

Cells transport material across a cell membrane without using energy (high to low concentration)

• Passive transport

• Concentration

• Endocytosis

• Active Transport