Molecular Motion

_____ occurs when small molecules pass through a membrane

• passive diffusion
• facilitated diffusion
• active transport
• active diffusion

The movement of water through the membrane in order to reach equilibrium is ________

• osmosis
• facilitated diffusion
• concentration gradient
• active transport

________ is the cell's maintaining it internal environment by regulating what comes in and out.

• homeostasis
• concentration gradient
• active transport
• facilitated diffusion

Tags

NGSS.HS-LS1-3

__________ uses ATP to power protein channels moving molecules into a hypertonic solution. 

• active transport
• facilitated diffusion
• passive diffusion
• ATP moleculase

The ________ is a range from high solute saturation to low.

• concentration gradient
• homeostatic divide
• equilibrium constant
• active transport 

When a membrane only allows certain molecules through, it is called ______

• selectively permeable
• passive diffusion
• equilibrated
• singly permeable

Which of the following molecular movements is due to osmosis or diffusion?

• Cells of the pancreas secrete insulin into the bloodstream.

• A plant cell is placed in concentrated NaCl solution and water moves out of the cell.

• Sodium potassium pump pumps 3 Na⁺ ions out of the cell for every 2 K⁺ ions it moves in.

Select the correct statement about osmosis.

• Osmotic equilibrium cannot be reached unless solute concentrations equalize across the membrane.

• Osmosis is the diffusion of water molecules across a selectively permeable membrane.

• If a dead cell is placed in a solution hypotonic to the cell contents, osmosis will not occur

In this image, the cell is using which type of molecular transport?

• Osmosis
• Diffusion 
• Endocytosis
• Exocytosis 

In this image, the cell is using which form of molecular transport?

• Pinocytosis 
• Exocytosis 
• Phagocytosis 
• Endocytosis