Biology STAAR Cell Transport

The diagram illustrates the movement of molecules through a cell membrane.

What process is being used by the cell to move the molecules?

• osmosis

• endocytosis

• active transport

• facilitated diffusion

Which cellular structure in an animal cell helps maintain homeostasis by controlling the transportation of substances into and out of the cell?

• vacuole

• cell membrane

• mitochondrion

• cell wall

Tags

NGSS.HS-LS1-3

A student used a microscope to observe Elodea submerged in a solution. The student observed the cell cytoplasm pull away from the cell wall and clump together in the center of the cell.

What statement best explains why this occurred?

• The cell was submerged in a pure water solution

• The cell was submerged in a solution with a higher water concentration than the inside of the cell.

• The cell was submerged in a solution with an equal water concentration to the inside of the cell.

• The cell was submerged in a solution with a lower water concentration than the inside of the cell.

Tags

NGSS.HS-LS1-3

Which process moves an ion across a cell membrane against the concentration gradient?

• diffusion

• exocytosis

• facilitated diffusion

• active transport

Which of these would be a model of diffusion?

• A student passes through a revolving door.

• Two students pass by each other in a hallway.

• Many students pass from a crowded room into an empty hallway.

• Two students bump into each other in a crowded school bus.

Shira is analyzing samples of red blood cells using a microscope. Her observations are shown.

Shira observes that the shape of cell A appears normal, while Cell B appears swollen and Cell C is shrunken. The shrinking of Cell C indicates that the cell is reacting to what?

• lower solute concentration outside the cell than inside

• an anaerobic environment outside the cell

• higher solute concentration outside the cell than inside

• more oxygen inside the cell than what can be used

Tags

NGSS.HS-LS1-3

The process of osmosis would explain the overall movement of water INTO a cell if the percentage of

• water was 90% inside the cell and 95% outside the cell.

• protein was 30% inside the cell and 35% outside the cell.

• water was 95% inside the cell and 90% outside the cell.

• water and protein was equal inside and outside the cell.

What should happen if there is no difference in concentration of a solute on either side of a semipermeable membrane?

• The system is in equilibrium with no net change in water movement across the membrane.

• There is a concentration gradient between the membranes.

• Membrane proteins can no longer function.

• All atoms and molecules stop moving.

The diagram illustrates the use of energy by a nerve cell to expel a sodium ion from inside the cell.

Which best explains why energy is necessary to complete this function?

• The ion is being transported against a concentration gradient.

• The ion has more kinetic energy than surrounding molecules.

• The ion is a waste product that is digested by the cell membrane.

• The ion is too large to pass through the cell membrane by diffusion.

A biologist diluted a blood sample with distilled water. While observing the sample under a microscope, she noted that the red blood cells burst. This bursting is most likely the result of which process?

• active transport

• staining

• ingestion

• osmosis