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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
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 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
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.
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?
Ions and polar molecules are charged or have uneven distribution of charge, which makes it difficult for them to pass through the hydrophobic lipid bilayer of the cell membrane. Transport proteins, such as ion channels or carriers, provide a pathway for these molecules to move across the membrane through facilitated diffusion or active transport.
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
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 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
Which of these are not embedded in the lipid bilayer at all?
Water, ions, and small polar molecules are not embedded in the lipid bilayer. Instead, they pass through protein channels or transporters in the membrane.
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.
What can't pass through the phospholipid bilayer?
Large molecules such as proteins, charged ions, and polar molecules have difficulty passing through the phospholipid bilayer due to its hydrophobic core. These molecules often require assistance from transport proteins or channels to facilitate their movement across the membrane.
Are ions able to cross the lipid bilayer?
Yes, it is possible.
What protein is an integral membrane protein that helps move molecules across a cell membrane?
An example of an integral membrane protein that helps move molecules across a cell membrane is a transporter protein. These proteins are embedded within the lipid bilayer and facilitate the movement of specific molecules such as ions or metabolites across the membrane through a process called facilitated diffusion or active transport.
What is a carrier protein that used ATP to actively transport sodium ions out of a cell and potassium ions into the cell?
That would be the Sodium-Potassium pump. Pretty creative name eh?
