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What organic molecules allow ions and polar molecules to pass through the plasma membrane?
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Give the Chemical nature of plasma membrane and cell wall?
plasma membrane is made of organic molecules called lipds and proteins
What type of molecules embebbed in the plasma membrane allows molecules to pass through the membrane by active or passive transport?
proteins
Which molecules difuse through the lipid portion of the plasma membrane?
Only nonpolar (hydrophobic) molecules can pass through the bi-lipid membrane. For example, hormones are nonpolar, and they can pass through the membrane.
What substance is most likely to passively diffuse across the plasma membrane by dissolving in the membrane?
Lipid-soluble molecules such as O2 and CO2 diffuse freely through the plasma membrane.
Do Hydrophobic molecules pass through the fatty-acid region of the plasma membrane easily?
no
Give the Chemical nature of plasma membrane and cell wall?
plasma membrane is made of organic molecules called lipds and proteins
What are the two main groups in a plasma membrane of organic molecules?
Proteins and lipids
What type of molecules embebbed in the plasma membrane allows molecules to pass through the membrane by active or passive transport?
proteins
Which molecules difuse through the lipid portion of the plasma membrane?
Only nonpolar (hydrophobic) molecules can pass through the bi-lipid membrane. For example, hormones are nonpolar, and they can pass through the membrane.
What is a holes in plasma membrane through which molecules pass across capillary wall?
The plasma membrane is made up of a lipid bilayer and some proteins. The transmembrane proteins are the structures which are involved in the transport of molecules in or through the cell.
What substance is most likely to passively diffuse across the plasma membrane by dissolving in the membrane?
Lipid-soluble molecules such as O2 and CO2 diffuse freely through the plasma membrane.
What molecules would be most likely to pass through the lipid bilyer of a plasma membrane?
ions and polar molecules
Do Hydrophobic molecules pass through the fatty-acid region of the plasma membrane easily?
no
What types of molecules have difficulty crossing the plasma membrane?
Large, polar, uncharged molecules cannot pass through a membrane without the help of protein channels embedded into the plasma membrane. Ions also have difficulty passing; they need ATPs.
What method carries molecules and pump molecules or form channels through which specific molecules pass across the plasma membrane?
Transport mechanisms
Why do most substances have to be assisted through the plasma membrane?
The plasma membrane is made from tightlypack phospholipids. The plasma membrane prevents polar molecules and large molecules from diffusing freely. Fatty (lipophilic) molecules can easily pass through. since cells often need water soluble materials such as water and sugars, transporters and pores need to be made out of proteins to let those molecules through. One of the most important pumps is the Na+/K+ ATPase pump which maintains gradients of sodium and potassium across the cell membrane
Osmosis can only if water travels through what?
Water molecules travel through the plasma membrane, tonoplast membrane. In biological systems, the solvent is typically water.
