Guidelines

What part of the cell membrane repels water?

What part of the cell membrane repels water?

The cell membrane is also called the PLASMA membrane and is made of a phospholipid BI-LAYER. The phospholipids have a hydrophilic (water attracting) HEADS and two hydrophobic (water repelling) TAILS. The head of a phospholipid is made of an alcohol and GLYCEROL group, while the tails are chains of FATTY ACIDS.

What 2 main molecules make up the cell membrane?

Cell membranes are composed primarily of fatty-acid-based lipids and proteins. Membrane lipids are principally of two types, phospholipids and sterols (generally cholesterol).

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Which component of the cell membrane is involved in allowing water molecules enter?

Water can move through the cell membrane directly through the membrane (simple diffusion ) or through protein channels called aquaporins.

What part of the cell membrane is nonpolar and prevents the cell from dissolving?

The heads, which form the outer and inner linings, are “hydrophilic” (water loving) while the tails that face the interior of the cell membrane are “hydrophobic” (water fearing). Water is attracted to the outsides (red) of the membrane but is prevented from going through the non-polar interior (yellow) layer.

What part of the cell membrane helps maintain flexibility of membrane?

Cholesterol
Cholesterol molecules also keep the phospholipid tails from coming into contact and solidifying. This ensures that the cell membrane stays fluid and flexible. Some plasma membrane proteins are located in the lipid bilayer and are called integral proteins.

What 3 molecules make up the cell membrane?

The principal components of the plasma membrane are lipids (phospholipids and cholesterol), proteins, and carbohydrate groups that are attached to some of the lipids and proteins.

What organelle makes cell membranes?

the ER
How Are Cell Membranes Synthesized? Membranes and their constituent proteins are assembled in the ER. This organelle contains the enzymes involved in lipid synthesis, and as lipids are manufactured in the ER, they are inserted into the organelle’s own membranes.

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What types of biological molecules make up the chloroplasts membranes?

The chloroplast is made up of 3 types of membrane: A smooth outer membrane which is freely permeable to molecules….Thylakoids

  • Photosystem I which includes chlorophyll and carotenoid molecules.
  • Photosystem II which also contains chlorophyll and carotenoid molecules.
  • Cytochromes b and f.
  • ATP synthase.

How do most water molecules move through hydrophobic cell membranes?

Water passes through the membrane in a diffusion process called osmosis. During active transport, energy is expended to assist material movement across the membrane in a direction against their concentration gradient.

Which of the following kinds of molecules passes through a cell membrane most easily?

Explanation: Small and simple molecules like water, H2O , can pass through the cell membrane easily as it is partially permeable.

What molecules are found in the cell membrane?

Cell membranes contain a variety of biological molecules, notably lipids and proteins. Material is incorporated into the membrane, or deleted from it, by a variety of mechanisms: The cell membrane consists of three classes of amphipathic lipids: phospholipids, glycolipids, and sterols.

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Can water molecules pass through a cell membrane?

It depends upon HOW they are to pass through the membrane. Water molecules can occasionally move through the lipid bilayer (membrane itself), but for a lot of water to move quickly, cells produce tunnel-shaped protein complexes specifically for water called aquaporins.

Can proteins go all the way through the cell membrane?

There are intrinsic and extrinsic proteins also attached to the exterior, or they can go all the way through the plasma membrane (ion channels, transport proteins). there is a layer of glycocalyx that surrounds the plasma membrane which consists of glycoproteins, glycolipids. What would happen if molecules could not pass through a cell membrane?

How do molecules pass through the fluid bilayer?

Lipid based molecules can dissolve in and the pass through the fluid bilayer via passive diffusion. Small/uncharged/non polar molecules can also pass through the gaps in the membrane, which are due to a mixture of unsaturated and saturated fatty acid tails in both monolayers of the bilayer.