Ch 2 cell biology

Define Facilitated diffusion.

• A process of passive transport of a substance through a membrane with the help of transport proteins.

• A process of active transport that uses energy to transport proteins.

• A process of osmosis that uses water molecules
• A process of endocytosis that uses vesicles

Are vesicles involved in passive transport? Explain.

• Yes, vesicles are involved in passive transport because they help in the movement of substances across the cell membrane.
• No, vesicles are not involved in passive transport because passive transport does not require energy.
• Yes, vesicles are involved in passive transport because they provide energy for the process.
• No, vesicles are not involved in passive transport because they are involved in active transport.

Why is pinocytosis a form of endocytosis?

• Because it involves the intake of solid particles
• Because it involves the intake of liquid particles
• Because it involves the release of solid particles
• Because it involves the release of liquid particles

What is phagocytosis and pinocytosis?

• Phagocytosis (cellular eating) is the process of engulfing solid particles by the cell membrane to form an internal compartment known as a phagosome, and pinocytosis (cellular drinking) is the ingestion of liquid into a cell by the budding of small vesicles from the cell membrane.

• Phagocytosis and pinocytosis are types of passive transport.
• Phagocytosis is the process of cell division, and pinocytosis is the process of cell growth.
• Phagocytosis and pinocytosis are types of cellular respiration.

Compare endocytosis and exocytosis.

• Endocytosis and exocytosis are the same process, just in different directions.
• Exocytosis involves the release of substances from a cell, while Endocytos involves the intake of substances into a cell.

• Endocytosis and exocytosis are processes that only occur in animal cells.

What is the meaning of concentration gradient?

• A difference in concentration of molecules across a distance

• The speed at which a substance diffuses
• The amount of a substance in a given volume
• The rate at which a substance reacts with another substance

Describe Equilibrium.

• The final state of diffusion where there's an equal concentration of molecules on both sides of the membrane.

• A state of constant change and imbalance where molecules separate unevenly.

• A state of constant motion when molecules get too hot.

• A state of extreme imbalance

What is a transport protein?

• A protein that transports nutrients and other substances across a cell membrane
• A protein that helps in muscle contraction
• A protein that provides structural support to cells
• A protein that speeds up chemical reactions

Give 3 examples of a transport protein.

• Hemoglobin, Myoglobin, Insulin
• Hemoglobin, Insulin, Glucagon
• Insulin, Glucagon, Glycogen
• Hemoglobin, Myoglobin, Glucagon

Explain how carrier proteins function.

• Carrier proteins function by moving molecules across the cell membrane without any energy input
• Carrier proteins function by changing shape so molecules can move across the cell membrane.

• Carrier proteins function by producing energy for the cell
• Carrier proteins function by protecting the cell from harmful substances