Podcast
Questions and Answers
Endocytosis requires energy
Endocytosis requires energy
True (A)
Exocytosis requires energy
Exocytosis requires energy
True (A)
Exocytosis brings things into the cell
Exocytosis brings things into the cell
False (B)
Endocytosis removes things from the cell
Endocytosis removes things from the cell
Passive transport does not require energy
Passive transport does not require energy
Diffusion is an example of passive transport
Diffusion is an example of passive transport
Sugars pass through the cell membrane without the aid of proteins
Sugars pass through the cell membrane without the aid of proteins
Osmosis is the transport of ions from high concentrations to low concentrations
Osmosis is the transport of ions from high concentrations to low concentrations
Only molecules that are entering the cell from the outside can diffuse via passive transport
Only molecules that are entering the cell from the outside can diffuse via passive transport
What is the term for molecules that are too big to go through the cell membrane?
What is the term for molecules that are too big to go through the cell membrane?
What is the passage of small molecules called?
What is the passage of small molecules called?
What is the movement of water called?
What is the movement of water called?
In passive cell transport, substances move from ______ concentrations to ______ concentrations
In passive cell transport, substances move from ______ concentrations to ______ concentrations
In order for substances to diffuse, a ______ gradient must exist
In order for substances to diffuse, a ______ gradient must exist
A concentration gradient is a ______ of concentrations between two regions
A concentration gradient is a ______ of concentrations between two regions
______ proteins or channel proteins are used to aid substances across the cell membrane in passive transport
______ proteins or channel proteins are used to aid substances across the cell membrane in passive transport
During passive transport, substances travel ______ the concentration gradient
During passive transport, substances travel ______ the concentration gradient
Facilitated diffusion uses ______ proteins to help aid some substances across the cell membrane
Facilitated diffusion uses ______ proteins to help aid some substances across the cell membrane
Cell membranes are ______ ______ because they allow some substances to pass through more easily than others
Cell membranes are ______ ______ because they allow some substances to pass through more easily than others
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Study Notes
Cell Transport Concepts
- Endocytosis is an energy-dependent process for bringing substances into a cell.
- Exocytosis, which expels materials from the cell, also requires energy.
- Exocytosis is characterized by the release of substances, not the entry into the cell.
- Endocytosis does not function to remove substances; it specifically transports materials into the cell.
Passive Transport Mechanisms
- Passive transport is characterized by movement that does not require energy.
- Diffusion exemplifies passive transport, allowing substances to move freely.
- Sugars cannot pass through the cell membrane without the assistance of protein channels.
- Osmosis is specifically the movement of water, not ions.
Concentration and Movement Principles
- Passive transport allows for the movement of molecules from high concentrations to low concentrations.
- A concentration gradient must exist for substances to diffuse, indicating a difference in concentration between two regions.
- Carrier proteins or channel proteins facilitate the movement of substances across the cell membrane during passive transport.
- During passive transport, substances move with the concentration gradient, from areas of higher concentration to areas of lower concentration.
Facilitated Diffusion
- Facilitated diffusion involves proteins to assist certain substances in crossing the cell membrane, particularly those that cannot passively diffuse.
Membrane Properties
- Cell membranes are described as selectively permeable, meaning they selectively allow certain substances to pass while restricting others.
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