In the phospholipid bilayer of a membrane, the fatty acid tails point inwards because they
Correct answer: C. are non polar and are excluded from the surrounding water
- A. are attracted to water molecules
- B. carry a strong negative charge
- C. are non polar and are excluded from the surrounding water
- D. are forced inwards by membrane proteins
Explanation
The hydrophobic tails avoid water while the polar phosphate heads face it, so the bilayer assembles itself with tails inside. This arrangement is driven by the chemistry of the tails themselves, not by proteins, which are inserted into a bilayer that has already formed.
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About Classification of Biological Molecules
Biological molecules are classified as carbohydrates, lipids, proteins and nucleic acids, with water, minerals and vitamins also supporting cellular processes. The key distinctions involve their monomers, chemical bonds, structures and functions, including glucose and starch, fatty acids and triglycerides, amino acids and polypeptides, and nucleotides in DNA and RNA.
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