Which of the following best describes the numbered areas?
a)Areas 1 and 3 are polar, since the membrane molecules are aligned with water molecules.
b)Area 2 is polar, since water has been excluded from this area of the membrane.
c) Areas 1 and 3 are hydrophilic, since membrane molecules formed covalent bonds with water.
d)Area 2 is nonpolar, since hydrogen bonds between the adjacent lipids hold the membrane together.

Regions 1 & 3 are referred to as hydrophilic because they are ‘water-loving’. This means they interact positively with water molecules and other polar solvents. The reason is that this part of the molecules has a negatively charged phosphate molecules that can interact wiht water through hydrogen bonding.

Part two is hydrophobic (‘water-hating) because it is not charged and has no way of interacting with a polar solvent. This is why they are embedded between the two hydrophilic layers.

luisvaschetto luisvaschetto · Answer 2 · 2021-10-16T13:26:20+02:00

The statement 'areas 1 and 3 are polar since the membrane molecules are aligned with water molecules' BEST describes the numbered areas.

The lipid bilayer is arranged so that one layer is exposed to the interior of the cell and the other layer is exposed to the exterior of the cell. The main component of the lipid bilayer is phospholipids.

Each phospholipid is composed of a polar phosphate head and two non-polar fatty acids tails.

The phosphate heads of phospholipids interact with water molecules and thereby they face the outward aqueous side (both internal and external membrane surfaces).

On the other hand, fatty acid tails are uncharged (non-polar), thereby they are found in the inner region of the cell membrane, away from water molecules.

In conclusion, the statement 'areas 1 and 3 are polar, since the membrane molecules are aligned with water molecules' BEST describes the numbered areas (Option a).

Learn more in:

https://brainly.com/question/5793606?referrer=searchResults