Question

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

Explanation:

• The cell membrane is a phospholipid bilayer, so "The cell membrane is made of two layers of phospholipids" is true.
• Phospholipid heads are hydrophilic. The intracellular environment (inside the cell) is aqueous (water - based), so phospholipid heads touch the intracellular environment.
• Phospholipid tails are hydrophobic and face each other in the middle of the bilayer, not touching the cytoplasm (which is aqueous).
• Phospholipid heads also touch the extracellular environment (which is aqueous).

Answer:

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