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The lipid bilayer is a tightly packed membrane of hydrophobic (dont like water) molecules, so only hydrophobic or very very small molecules can go directly through it. Large molecules such as hormones need to have a special hole in the membrane that they can fit through, but some are so large that if the membrane created a plain old hole, everything would be able to fit through, even things the cell doesnt want.
The proteins create special openings that allow only a specific variety of molcule to go through, like only a special type of hormone. They work a lot like a lock and key, so when the molecule encounters its protein, it acts like a key and opens the portal. once the molecule passes, the protein closes the opening and nothing else can go through.
What else can I help you with?
In the membrane of a cell channels serve as what?
Channels in the cell membrane serve as passageways for the selective transport of ions and molecules into and out of the cell. They help maintain the cell's internal environment by controlling the flow of substances across the membrane.
Channels within the structure of the cell membrane are composed of....?
Simply stated: ProteinsChannels within the structure of the cell membrane are composed of proteins. A protein that forms an ion channel through a membrane is called a transmembrane protein.
Which part of the cell allows for selective permeability?
The cell membrane, composed of phospholipids and proteins, allows for selective permeability. Its structure enables it to regulate the passage of molecules in and out of the cell, ensuring that only certain substances can cross based on their size, charge, and solubility.
What functions do proteins have in the cell membrane?
Receptors, Selective Channels and pores
A membrane at the boundry of every cell that acts as a selective barrier?
The cell membrane is a phospholipid bilayer that acts as a selective barrier, controlling the passage of molecules into and out of the cell. It helps maintain cellular homeostasis by regulating the entry and exit of substances such as ions, nutrients, and waste products.
These structure are passageways from the nucleus that transport proteins through the cell?
cell membrane
In the membrane of a cell channels serve as what?
Channels in the cell membrane serve as passageways for the selective transport of ions and molecules into and out of the cell. They help maintain the cell's internal environment by controlling the flow of substances across the membrane.
What is the characteristic of a cell membrane that controls which substances that can either enter and exit the cell?
Selective permeable
What are passage way in a cell membrane called?
Passageways in a cell membrane are called channels or transport proteins. These structures facilitate the movement of ions, molecules, and nutrients into and out of the cell, allowing for selective permeability. Some channels are specific to particular substances, while others can change shape to accommodate various molecules. Additionally, there are also carrier proteins that assist in transporting larger molecules across the membrane.
Structure that makes proteins and lipids and that contains passageways through which substances move form place to place in the cell?
The cell membrane.
What is passageways that carry proteins and other materials from one part of a he cell to another?
endoplasmic reticulum
Channels within the structure of the cell membrane are composed of....?
Simply stated: ProteinsChannels within the structure of the cell membrane are composed of proteins. A protein that forms an ion channel through a membrane is called a transmembrane protein.
Which part of the cell allows for selective permeability?
The cell membrane, composed of phospholipids and proteins, allows for selective permeability. Its structure enables it to regulate the passage of molecules in and out of the cell, ensuring that only certain substances can cross based on their size, charge, and solubility.
What functions do proteins have in the cell membrane?
Receptors, Selective Channels and pores
What part of the cell acts like a selective filter and determines what goes in and out of the cell?
The plasma membrane is selectively permeable, allowing certain molecules to travel in and out of the cell. The size, PH, and temperature all play a factor in what molecules travel through the membrane or don't.
A membrane at the boundry of every cell that acts as a selective barrier?
The cell membrane is a phospholipid bilayer that acts as a selective barrier, controlling the passage of molecules into and out of the cell. It helps maintain cellular homeostasis by regulating the entry and exit of substances such as ions, nutrients, and waste products.
Passageways that carry proteins and other materials from one part of the cell to another are called?
Passageways that carry proteins and other materials from one part of the cell to another are called vesicles. Vesicles are membrane-bound sacs that transport materials within the cell through processes like endocytosis, exocytosis, and intracellular trafficking.
