Amoeba Sisters Video Recap Cell Transport Answers Pdf
If you are a student studying cell biology or a related field, you have probably heard of the Amoeba Sisters. The Amoeba Sisters are a pair of sisters who create educational videos on biology and other science topics. One of their popular video series is on cell transport. In this article, we will provide a recap of their video on cell transport and provide answers to the accompanying PDF worksheet.
What is Cell Transport?
Cell transport refers to the movement of materials across the cell membrane. This movement can be divided into two categories: passive transport and active transport. Passive transport does not require energy from the cell, while active transport requires energy in the form of ATP.
Passive Transport
Passive transport includes three types of movements: diffusion, osmosis, and facilitated diffusion. Diffusion refers to the movement of molecules from an area of high concentration to an area of low concentration. Osmosis is the diffusion of water molecules across a selectively permeable membrane. Facilitated diffusion is the movement of larger molecules, such as glucose, through protein channels in the cell membrane.
Diffusion
Diffusion occurs when there is a concentration gradient, which means that there are more molecules on one side of the membrane than the other. This creates a net movement of molecules from the side with more molecules to the side with fewer molecules until equilibrium is reached. Diffusion is a passive process and does not require energy.
Osmosis
Osmosis is the diffusion of water molecules across a selectively permeable membrane. Selectively permeable means that only certain molecules can pass through the membrane. If there is a higher concentration of solute, such as salt, on one side of the membrane, water will move from an area of low solute concentration to an area of high solute concentration to try to equalize the concentration on both sides. This process is passive and does not require energy.
Facilitated Diffusion
Facilitated diffusion is the movement of larger molecules, such as glucose, through protein channels in the cell membrane. These protein channels are specific to certain molecules and allow them to move across the membrane without expending energy. Facilitated diffusion is a passive process.
Active Transport
Active transport requires energy in the form of ATP. This process moves molecules against their concentration gradient, from an area of low concentration to an area of high concentration. Active transport is important for moving molecules that are too large, too polar, or too charged to diffuse across the membrane through passive transport.
Sodium-Potassium Pump
The sodium-potassium pump is an example of active transport. It moves three sodium ions out of the cell and two potassium ions into the cell for each ATP molecule used. This process is important for maintaining the concentration gradient of these ions and for nerve impulse transmission.
Amoeba Sisters Cell Transport Recap PDF Worksheet Answers
The Amoeba Sisters provide a PDF worksheet to accompany their cell transport video. Here are the answers to the worksheet questions:
- What is the cell membrane made of?
Answer: The cell membrane is made of a phospholipid bilayer. - What is the definition of passive transport?
Answer: Passive transport is the movement of molecules across the cell membrane without the use of energy. - List the three types of passive transport.
Answer: The three types of passive transport are diffusion, osmosis, and facilitated diffusion. - What is the definition of active transport?
Answer: Active transport is the movement of molecules across the cell membrane using energy. - What is an example of active transport?
Answer: An example of active transport is the sodium-potassium pump.
Conclusion
In summary, cell transport refers to the movement of materials across the cell membrane. There are two types of cell transport: passive transport and active transport. Passive transport includes diffusion, osmosis, and facilitated diffusion, while active transport requires energy in the form of ATP and moves molecules against their concentration gradient. The Amoeba Sisters provide an informative video on cell transport and offer a helpful PDF worksheet to reinforce the concepts learned. By understanding cell transport, we can better appreciate the complex processes that occur within our own bodies.
