Cell Transport Mechanisms and Gradients Explained

The video tutorial explains cell transport mechanisms, distinguishing between passive and active transport. Passive transport includes diffusion, osmosis, and facilitated diffusion, where substances move from high to low concentration. Active transport requires energy and involves pumps or vesicles, with primary transport using ATP directly and secondary transport using stored energy. Vesicle transport includes exocytosis and endocytosis, with specific processes like phagocytosis and pinocytosis.

What is the main difference between passive and active transport?

• Neither requires energy.

• Both require energy but in different forms.

• Active transport requires energy, while passive transport does not.

• Passive transport requires energy, while active transport does not.

Which type of gradient is formed due to a difference in solute concentration across a membrane?

• Electrical gradient

• Thermal gradient

• Chemical gradient

• Electrochemical gradient

In simple diffusion, substances move through the cell membrane:

• With the help of transport proteins

• Against the concentration gradient

• Directly through the membrane

• Using vesicles

What happens to water movement in an isotonic solution?

• There is no net movement of water

• Water moves randomly

• Water moves into the solution

• Water moves out of the solution

Which type of solution causes water to flow out of a cell?

• Hypotonic

• Neutral

• Hypertonic

• Isotonic

Which type of active transport uses ATP directly?

• Secondary transport

• Primary transport

• Facilitated diffusion

• Osmosis

What is the role of a symporter in secondary transport?

• Moves two molecules in opposite directions

• Moves two molecules in the same direction

• Moves one molecule against its gradient

• Moves one molecule with its gradient

What is the primary role of ATP in active transport?

• To create concentration gradients

• To provide structural support

• To act as a transport protein

• To supply energy for moving substances

Which process is described as 'cellular eating'?

• Receptor-mediated endocytosis

• Pinocytosis

• Phagocytosis

• Exocytosis

What is the main function of clathrin in receptor-mediated endocytosis?

• To digest particles

• To coat vesicles and select cargo

• To transport water

• To provide energy