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It's called passive transport. An example of passive transport is O2 (Oxygen), and CO2 (Carbon Dioxide). They both use a "key" to get into the cell, in this case, the key is the chemical formula of O2. Things without a key require the cell to use energy to use endocytosis and exocytosis.
(At least that's what my 8th grade science teacher told me!)
What else can I help you with?
What is it called when a molecule uses energy to move across a semiseprable membrane?
active transport
What uses a protein to move a molecule across a cell membrane without using energy?
Facilitated diffusion uses proteins to move a molecule across the cell membrane without energy.
The process where a nonpolar molecule can just passively get across a membrane is called?
facilitated diffusion
Assisted transport of a molecule across the cell membrane without an expenditure of energy is known as?
Passive transport. It relies on the natural movement of molecules from an area of higher concentration to an area of lower concentration, following the concentration gradient. Examples include diffusion and facilitated diffusion.
What is it called when a cell membrane closes around a molecule to allow the molecule to enter the cell?
selectively permiable membrane (you might want to double check that though...)
What is it called when a molecule moved across a membrane through a protein channel without using energy?
Passive Transport
What is it called when molecule moves across a membrane through a protein channel without using energy?
Passive Transport
What is it called a molecule moves across a membrane through a protein channel without using energy?
Passive Transport
What is it called when a molecule moves across a membrane through a protein channel without using energy '?
Passive Transport
What is it called when a molecule uses energy to move across a semiseprable membrane?
active transport
What is the movement of small molecule across a cell membrane up its concentration gradient called?
eflux
What uses a protein to move a molecule across a cell membrane without using energy?
Facilitated diffusion uses proteins to move a molecule across the cell membrane without energy.
The process where a nonpolar molecule can just passively get across a membrane is called?
facilitated diffusion
What molecules will move easily across the cell membrane: large proteins, starch, water, or DNA?
Water is the molecule that will move easily across the cell membrane. It can cross the membrane through special channels called aquaporins. Large proteins, starch, and DNA are too large to pass through the membrane without assistance.
What is it called when a molecule moves a membrane through a protein channel without using energy?
passive transport
When a protein helps a molecule across the membrane is?
the processe is called osmosis Try again, this time use the term "facilitated transport" since a protein molecule is helping.
What is the transport of water across the cell membrane called?
Movement of water across a membrane is called OSMOSIS.
