Passive Transport, Active Transport, & Cell Environments WO

______proteins or channel proteins are used to aid substances across the cell membrane in passive transport.

Carrier proteins or channel proteins are used to aid substances across the cell membrane in passive transport.

Cell membranes are ________ ___________ because they allow some substances to pass through more easily than others.

Cell membranes are selectively permeable because they allow some substances to pass through more easily than others.

During passive transport, substances travel _____ the concentration gradient.

During passive transport, substances travel with the concentration gradient.

T or F. Only molecules that are entering the cell from the outside can diffuse via passive transport.

F; Molecules that are entering or exiting the cell can diffuse via passive transport.

T or F. Osmosis is the transport of ions from high concentrations to low concentrations.

F; Osmosis is the transport of water from high concentrations to low concentrations.

T or F. Sugars pass through the cell membrane without the aid of proteins.

F; Sugars pass through the cell membrane with the aid of proteins.

Facilitated diffusion uses _________ _________ to help aid some substances across the cell membrane.

Facilitated diffusion uses transport proteins to help aid some substances across the cell membrane.

The tonicity of a solution is determined by the presence of solutes that can or cannot easily pass the cell membrane.

The tonicity of a solution is determined by the presence of solutes that cannot easily pass the cell membrane.

In a HYPERTONIC solution, there is a higher or lower amount of solutes outside the cell relative to the inside of a cell.

In a HYPERTONIC solution, there is a higher amount of solutes outside the cell relative to the inside of a cell.

In order for substances to diffuse, a _________ gradient must exist.

In order for substances to diffuse, a concentration gradient must exist.

In passive cell transport, substances move from ______ concentrations to _______ concentrations.

In passive cell transport, substances move from high concentrations to low concentrations.

T or F. Diffusion is an example of passive transport.

T

T or F. Passive transport does not require energy.

T