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Can chlorine ions pass through the phospholipid bilayer of the plasma membrane?
Chlorine ions (Cl⁻) cannot easily pass through the phospholipid bilayer of the plasma membrane due to their charge and polarity. The hydrophobic interior of the bilayer acts as a barrier to charged particles. Instead, chlorine ions typically require specific ion channels or transport proteins to facilitate their movement across the membrane. These channels allow ions to bypass the lipid bilayer's hydrophobic core, enabling cellular processes that depend on ion transport.
In what type of passive transport do protein channels assist molecules across the membrane?
In facilitated diffusion, protein channels assist molecules in crossing the cell membrane. This type of passive transport allows substances, such as ions and polar molecules, to move down their concentration gradient without using energy. The protein channels provide a pathway through the lipid bilayer, enabling the selective transport of specific molecules.
What means that the transport protein makes it easier for a molecule that cannot directly cross the cell membrane to enter or exit a cell?
When a transport protein facilitates the movement of a molecule across the cell membrane, it acts as a channel or carrier that helps the molecule bypass the lipid bilayer, which is generally impermeable to large or polar substances. This process, known as facilitated diffusion, allows essential molecules, like glucose or ions, to enter or exit the cell efficiently without expending energy. By providing a pathway, transport proteins ensure that cells can maintain homeostasis and properly regulate their internal environment.
Membrane pores consist of what chemically?
Membrane pores consist of proteins, specifically transmembrane proteins such as ion channels or porins. These proteins create passageways through the lipid bilayer of the membrane, allowing for the selective transport of ions or molecules across the membrane.
Why is it important that ions being transported across a cell membrane be shielded from the interior of the lipid bilayer?
Because the ions are charged, indicating high polarity, which lipids do not possess; they're hydrophobic, and therefore ions cannot pass through the lipid bilayer since lipids are highly unpolar, unless through an ion channel, which has a higher polarity
Can chlorine ions pass through the phospholipid bilayer of the plasma membrane?
Chlorine ions (Cl⁻) cannot easily pass through the phospholipid bilayer of the plasma membrane due to their charge and polarity. The hydrophobic interior of the bilayer acts as a barrier to charged particles. Instead, chlorine ions typically require specific ion channels or transport proteins to facilitate their movement across the membrane. These channels allow ions to bypass the lipid bilayer's hydrophobic core, enabling cellular processes that depend on ion transport.
In what type of passive transport do protein channels assist molecules across the membrane?
In facilitated diffusion, protein channels assist molecules in crossing the cell membrane. This type of passive transport allows substances, such as ions and polar molecules, to move down their concentration gradient without using energy. The protein channels provide a pathway through the lipid bilayer, enabling the selective transport of specific molecules.
Do ions require a transport protein?
Not in blood, ions are usually quite water soluble.
Why do Ions and polar molecules require transport proteins to enter or leave a cell?
Not necessarily. It helps to be polar because the lipid bilayer is polar and it helps to pull molecules through, but if its a molecule that the cell doesn't want it wont pull it through. Water (a polar molecule) can go through the membrane anywhere but other nutrients need the help of transport proteins.
What means that the transport protein makes it easier for a molecule that cannot directly cross the cell membrane to enter or exit a cell?
When a transport protein facilitates the movement of a molecule across the cell membrane, it acts as a channel or carrier that helps the molecule bypass the lipid bilayer, which is generally impermeable to large or polar substances. This process, known as facilitated diffusion, allows essential molecules, like glucose or ions, to enter or exit the cell efficiently without expending energy. By providing a pathway, transport proteins ensure that cells can maintain homeostasis and properly regulate their internal environment.
Membrane pores consist of what chemically?
Membrane pores consist of proteins, specifically transmembrane proteins such as ion channels or porins. These proteins create passageways through the lipid bilayer of the membrane, allowing for the selective transport of ions or molecules across the membrane.
Why is it important that ions being transported across a cell membrane be shielded from the interior of the lipid bilayer?
Because the ions are charged, indicating high polarity, which lipids do not possess; they're hydrophobic, and therefore ions cannot pass through the lipid bilayer since lipids are highly unpolar, unless through an ion channel, which has a higher polarity
What type of transport does a small molecule enter a cell with help from a membrane protein additional energy is needed to complete this process?
Facilitated
How do fats cross the cell membrane?
Fats can cross the cell membrane through passive diffusion, facilitated diffusion, or by being transported with the help of carrier proteins. These methods allow fats to move across the lipid bilayer and enter the cell for various cellular processes.
What does a channel protein do in the context of cellular transport?
A channel protein helps facilitate the passage of specific molecules or ions across a cell membrane, allowing for efficient and selective transport in and out of the cell.
Which of these are not embedded in the lipid bilayer at all?
Bacteria prokaryotic cells and eukaryotic.
What is the protein that shuttles hydrogen ions in the electron transport chain?
The protein that shuttles hydrogen ions in the electron transport chain is called cytochrome c oxidase. It is located in the inner mitochondrial membrane and is responsible for transferring electrons to oxygen to form water while pumping hydrogen ions across the membrane, creating a proton gradient.
