Active Transport and Cell Processes

This video tutorial from Moomoomath and Science explains active transport in cells, which requires energy to move substances against the concentration gradient. It contrasts active transport with passive transport, which does not require energy. The video discusses the role of ATP in providing energy for active transport and describes three types of active transport: membrane pumps, endocytosis, and exocytosis. Membrane pumps, like the sodium-potassium pump, move ions across the cell membrane, while endocytosis and exocytosis involve vesicle movement to transport larger molecules into and out of the cell.

What is the main difference between passive and active transport in cells?

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

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

• Both require energy to move substances.

• Neither requires energy to move substances.

Why does active transport require energy?

• Because it moves substances from high to low concentration.

• Because it moves substances from low to high concentration.

• Because it moves substances without a concentration gradient.

• Because it moves substances through osmosis.

What molecule provides the energy for active transport?

• FADH2

• Glucose

• NADH

• ATP

What is the function of a sodium-potassium pump?

• To move both sodium and potassium ions into the cell.

• To move potassium ions into the cell and sodium ions out.

• To move sodium ions into the cell and potassium ions out.

• To move both sodium and potassium ions out of the cell.

How many sodium ions are moved for every two potassium ions in the sodium-potassium pump?

• Two sodium ions

• One sodium ion

• Three sodium ions

• Four sodium ions

What is endocytosis?

• The process of expelling large molecules from the cell.

• The process of moving ions across the cell membrane.

• The process of engulfing large molecules into the cell.

• The process of synthesizing ATP in the cell.

What is exocytosis used for in cells?

• To bring nutrients into the cell.

• To expel waste products from the cell.

• To synthesize proteins within the cell.

• To divide the cell into two.

Which of the following is an example of exocytosis?

• A plant cell photosynthesizing.

• A cell absorbing glucose.

• A neuron releasing neurotransmitters.

• A muscle cell contracting.