⚪R6: MIDTERM REVIEW: UNIT 2: PART 3: 2D 16W S1 24

Front

What is osmosis?

Back

Osmosis is the movement of water molecules through a selectively permeable membrane from an area of lower solute concentration to an area of higher solute concentration.

Front

What is the difference between active transport and passive transport?

Back

Active transport requires energy to move substances against their concentration gradient, while passive transport does not require energy and moves substances along their concentration gradient.

Front

What is a phospholipid bilayer?

Back

A phospholipid bilayer is a double layer of phospholipids that makes up the cell membrane, providing a barrier to protect the cell and regulate what enters and exits.

Front

What is exocytosis?

Back

Exocytosis is the process by which large molecules are transported out of the cell by vesicles that fuse with the cell membrane.

Front

What is endocytosis?

Back

Endocytosis is the process by which cells take in large molecules by engulfing them in a portion of the cell membrane that pinches off to form a vesicle.

Front

What is diffusion?

Back

Diffusion is the passive movement of molecules from an area of higher concentration to an area of lower concentration until equilibrium is reached.

Front

What role do glycoproteins play in the cell membrane?

Back

Glycoproteins serve as recognition sites for cell signaling and communication, helping cells identify and interact with each other.

Front

What is the function of cholesterol in the cell membrane?

Back

Cholesterol helps to stabilize the fluidity of the cell membrane, making it less permeable to very small water-soluble molecules that might otherwise pass freely through.

Front

What is the significance of the selectively permeable membrane?

Back

A selectively permeable membrane allows certain substances to pass while blocking others, maintaining the internal environment of the cell.

Front

What is the concentration gradient?

Back

The concentration gradient is the difference in the concentration of a substance across a space, which drives the movement of molecules during diffusion.