The concept of a membrane as a fluid mosaic reflects the ability of a. most proteins but not phospholipids to drift about in the plane of the membrane b. carbohydrates to drift into and out of the membrane structure c. phospholipids but not proteins to drift about in the plane of the membrane d. phospholipids and most proteins to drift about in the plane of the membrane

The correct answer is D. phospholipids and most proteins to drift about in the plane of the membrane

Explanation:

The fluid mosaic model tells us about the structure and behavior of the cell membrane. This model shows that the membrane is a mosaic of various components that provides fluidity in the membrane and these components are phospholipids, proteins, cholesterol, and carbohydrate.

So due to this fluid nature of membrane, the phospholipids and most of the protein in the membrane can do lateral drift that means they can drift about the plane of the membrane. The lateral movement of phospholipids is rapid than proteins because proteins are bigger than lipids.  

This movement of components is necessary to transport the substance across the cell. So the correct answer is D.

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the relative atomic mass of an element is the mass of one atom of that element, relative to 1/12th of the mass of a  1212c atom. to convert to an absolute mass in kg, it is necessary to multiply by  1.661×10−271.661×10−27.

the relative atomic mass is roughly equal to the number of neutrons, plus the number of protons, in the nucleus of the atom.

for elements with more than one stable isotope (different types of nucleus with different numbers of neutrons but the same number of protons), the quoted mass is usually the average mass, weighted by the relative abundance of the different isotopes.