Questions: Question 10 1 Point Which of the following monomer building blocks is necessary to assemble selectively permeable boundaries around and inside cells? (A) sugars (B) fatty acids (C) amino acids (D) nucleotides

The answer is (B): fatty acids.

Explanation for each option: (A) Sugars: Sugars are primarily involved in energy storage and structural components of cells, but they are not the main building blocks for selectively permeable boundaries. (B) Fatty acids: Fatty acids are the key components of lipids, which form the lipid bilayer of cell membranes. These membranes are selectively permeable, allowing certain substances to pass through while blocking others. (C) Amino acids: Amino acids are the building blocks of proteins, which can be part of the cell membrane but are not the primary components of the selectively permeable boundary itself. (D) Nucleotides: Nucleotides are the building blocks of nucleic acids (DNA and RNA) and are not involved in forming the selectively permeable boundaries of cells.

Summary: Fatty acids are necessary to assemble selectively permeable boundaries around and inside cells, making option (B) the correct answer.