Question

Biological membranes are present in all cells, and in eukaryotic cells they also form the endomembrane system. They act as gatekeepers that selectively move certain ions and compounds into and out of the cell or cell organelles. (a) Which of the following best describes a biological membrane?
a bilayer containing lipids with hydrophilic head groups facing the extracellular fluid and cytoplasm, and hydrophobic tail groups extending inward...OR... a bilayer containing lipids with hydrophobic head groups facing the extracellular fluid and cytoplasm, and hydrophilic tail groups extending inward...OR... a bilayer containing lipids with hydrophilic head groups facing inward and hydrophobic tail groups extending toward the extracellular fluid and cytoplasm.
(b) Which of the following are components of biological membranes? select all that apply...... nucleic acids...OR...lipids...OR...protiens

Answer 1

A bilayer containing lipids with a hydrophilic head.Biological membranes are present in all cells and in eukaryotic cells they also form the endomembrane system.

They act as gatekeepers that selectively move certain ions and compounds in and out of the cell or cell organelles.Biological membranes allow life as we know it to exist. They form cells and allow the separation between the interior and exterior of an organism, controlling through their selective permeability which substances enter and exit.The main components of biological membranes are proteins, lipids and carbohydrates in variable.They act as gatekeepers that selectively move certain ions and compounds in and out of the cell or cell organelles proportions. Carbohydrates represent less than 10% of the mass of most membranes and are usually bound to lipid or protein components.Myelin has few functions and is composed almost entirely of lipids.The most widely accepted model for the structure of the plasma membrane is the fluid mosaic model.According to this model,the plasma membrane is made up of a phospholipid bilayer that has proteins embedded in it.

To learn more about membranes please click on below link.

https://brainly.com/question/26872631.

#SPJ4