In the fluid mosaic model of membrane structure, Select one: a. the proteins exist in a bilayer formation. b. the phospholipids are tightly bound in place. c. the carbohydrates are found exclusively on the intracellular surface of the membrane. d. the phospholipids act as a barrier to the passage of polar substances between the ICF and ECF e. the phospholipids arrange themselves into the shape of a channel, in order to allow ions to transport across the membrane.

D) The phospholipids act as a barrier to the passage of polar substances between the ICF and ECF

Explanation:

The plasma membrane is made up of four major kinds of molecules which include; proteins, carbohydrates, cholesterol and phospholipids.

Phospholipids are the main structure of plasma membranes. The structure of phospholipids help it serve as a barrier by playing a role in the regulation of the movement of polar molecules intracellular and extracellular fluid compartments and therefore, protect the cell.

The phospholipid structure can be described as having two ends of a head and a tail. The head end is hydrophilic or water-loving, and contains a phosphate group. The tail is hydrophobic and is made up of fatty acid chains.

Phospholipids are arranged in a bilayer with the hydrophilic head facing outwards into the ECF and ICF and the hydrophobic tail facing inwards.

Examples of phospholipids found in the plasma membrane are phosphatidylcholine and phosphatidylserine.

the relative standard reduction potential of the half-cell in which reduction occurs; more positive than the other half-cell. reduction is a chemical process in which electrons are added to an atom or an ion; it always occurs accompanied by oxidation of the reducing agent.

the two answers are a, the population of birds with large beaks will increase on the island, and c, the trait for large beaks will be passed on to future generations through natural selection. the reason for that is because if the birds that have beaks developed for eating small seeds lose all of their food, they will go hungry and eventually starve because they physically cannot eat the large seeds, therefore making the population of large beaked birds higher. also, if the trait of large beaks are dominant on the island over small beaks, then over time the large beaked birds will reproduce more and more, while the smaller beaked birds will reproduce less and less because they can't survive with the food provided. that leads to the trait of small beaks disappearing and the trait of large beaks taking over the island.