Hich of the following describes the structure and function of the cell membrane? a. the hydrophilic head groups of the lipid molecules are exposed to the outside of the cell and the cytoplasm, which is a water-like environment. the hydrophobic tails form an oily layer inside the membrane that keeps water out of the cell. b. the hydrophilic head groups of the lipid molecules are exposed to the outside of the cell and the cytoplasm, which is a water-like environment. the hydrophobic tails form an oily layer inside the membrane that allows water to enter the cell. c. the hydrophobic head groups of the lipid molecules are exposed to the outside of the cell, which is a water-like environment. the hydrophilic tails form an oily layer inside the membrane that keeps water out of the cell. d. the hydrophobic head groups of the lipid molecules are exposed to the outside of the cell, which is a water-like environment. the hydrophilic tails form an oily layer inside the membrane that allows water to enter the cell.

The correct answer is: A. The hydrophilic head groups of the lipid molecules are exposed to the outside of the cell and the cytoplasm, which is a water-like environment. The hydrophobic tails form an oily layer inside the membrane that keeps water out of the cell.

Plasma membrane of the cell is arranged in a bilayer of phospholipids. Phospholipids are amphipathic molecules which means that they have both hydrophilic and hydrophobic regions. The hydrophilic heads of phospholipids that are faced outward and hydrophobic layer located in the interior of the bilayer together make a good barrier between the interior and exterior of the cell, so the water and other polar or charged substances cannot easily cross the hydrophobic core of the membrane.

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answer: ice crystals in air

the water from the water body or another source of water gets evaporated as water vapor as an effect of heat on water. these water vapor rises in the upper layers of the earth atmosphere under high atmospheric pressure. the atmospheric pressure of these water molecules starts to decrease due to the effect of cold air. the invisible water vapor condenses into visible water droplets and ice crystals.these ice crystals and water droplets being less denser than the surrounding air floats on air as clouds.