Question

select the true statements. phospholipid heads touch the intracellular environment. phospholipid tails touch the cytoplasm inside the cell. phospholipid heads touch the extracellular environment. the cell membrane is made of two layers of phospholipids.

Explanation:

• Phospholipid heads are hydrophilic (water - loving). The intracellular environment (inside the cell) and the extracellular environment (outside the cell) are aqueous (water - based). So, phospholipid heads touch both the intracellular and extracellular environments.
• Phospholipid tails are hydrophobic (water - fearing). They are in the middle of the phospholipid bilayer and do not touch the cytoplasm (intracellular fluid).
• The cell membrane is a phospholipid bilayer, which means it is made of two layers of phospholipids.

Answer:

• Phospholipid heads touch the intracellular environment.
• Phospholipid heads touch the extracellular environment.
• The cell membrane is made of two layers of phospholipids.