7th - Evaluation Cell Transport

Front

What is diffusion?

Back

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

Front

What happens to sugar molecules when pure water is added to a solution of 40% sugar and 60% water separated by a semipermeable membrane?

Back

Sugar molecules will move across the membrane until the concentrations are equal.

Front

Define osmosis.

Back

Osmosis is the movement of water through a partially permeable membrane from a dilute solution to a more concentrated solution.

Front

What is endocytosis?

Back

Endocytosis is a form of cellular transport where cells engulf substances from their external environment.

Front

Identify the three processes represented in a cell surface membrane diagram: Active transport, diffusion, and simple diffusion.

Back

1. Active transport: movement against the concentration gradient using energy. 2. Diffusion: movement of molecules from high to low concentration. 3. Simple diffusion: passive movement of small molecules through the membrane.

Front

What is the effect of placing a leaf palisade cell in a highly concentrated sugar solution?

Back

The cell will lose water and may become plasmolyzed, leading to a shriveled appearance.

Front

What is the role of a semipermeable membrane in cellular transport?

Back

A semipermeable membrane allows certain molecules to pass through while blocking others, facilitating selective transport.

Front

Explain 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 the concentration gradient?

Back

The concentration gradient is the difference in concentration of a substance between two areas, which drives the movement of molecules.

Front

How does temperature affect the rate of diffusion?

Back

Higher temperatures increase the kinetic energy of molecules, leading to a faster rate of diffusion.