Cell Membrane and Transport Quiz

This shows a sugar solution with a selectively permeable membrane. What has occurred?

• water did not cross the membrane

• water diffused toward higher sugar concentration

• sugar molecules crossed the membrane

• water diffused toward lower sugar concentration

Which cellular structure helps control what enters and leaves the cell?

• plasma membrane

• cytoskeleton

• nucleus

• cytoplasm

Which of these describes continuous particle movement with no overall change in concentration?

• selective permeability

• facilitated diffusion

• osmosis

• dynamic equilibrium

Which of the following is not true of exocytosis?

• results in hormone secretion

• occurs at the plasma membrane

• does not require energy input

• allows waste matter to be expelled

The picture shows the movement of ink molecules in water. Which of the following processes has occurred?

• exocytosis

• diffusion

• endocytosis

• osmosis

Carbon Dioxide and Oxygen are molecules that can move freely across a plasma membrane. What determines the direction that Carbon Dioxide and Oxygen molecule move?

• orientation of cholesterol in the plasma membrane

• concentration gradient across the plasma membrane

• configuration of phospholipids in the plasma membrane

• location of receptors on the surface of the plasma membrane

How do carrier proteins facilitate active transport?

• create an isotonic solution

• move substances against a concentration gradient

• block the plasma membrane

• prevent homeostasis

The animal cells below were placed in a hypotonic solution. What happened to the damaged cell?

• The cell was damaged by bacteria.

• Osmosis caused the cell to shrivel.

• Osmotic pressure caused the cell to rupture.

• Osmosis was prevented in the cell.

What describes transport proteins moving molecules across the plasma membrane?

• osmosis

• dynamic equilibrium

• diffusion

• facilitated diffusion

Why does misting fruits and vegetables with water help them look fresh?

• Water cannot move through the cell membrane.

• Plant cells in a hypotonic solution lose water.

• Plants do not have a rigid cell wall.

• Vacuoles fill with water due to osmosis.