Question

1. draw a picture of the phospholipid bilayer sheet below and label the head & tails

Explanation:

To draw a phospholipid bilayer:

1. Structure of Phospholipid: A phospholipid has a hydrophilic (water - attracting) head and two hydrophobic (water - repelling) tails. The head is made of a phosphate group and glycerol, and the tails are fatty acid chains.
2. Bilayer Arrangement: In an aqueous environment, phospholipids arrange themselves in a bilayer. The hydrophilic heads face outward (towards the aqueous solution, either extracellular or intracellular fluid), and the hydrophobic tails face inward (towards each other, away from water).
3. Drawing Steps:

• Draw two parallel rows of phospholipid molecules.
• For each phospholipid, draw a circular or oval - shaped head (label it "Hydrophilic Head") and two wavy or straight lines for the tails (label them "Hydrophobic Tails").
• In the top row, the heads should be facing upward (towards the outside, e.g., extracellular space), and the tails facing downward (towards the middle of the bilayer). In the bottom row, the heads should be facing downward (towards the inside, e.g., intracellular space), and the tails facing upward (towards the middle of the bilayer).

Answer:

(Here is a textual description of the phospholipid bilayer drawing:

• Draw two horizontal rows of phospholipids.
• In the upper row, draw oval - shaped heads (label "Hydrophilic Head") at the top of each phospholipid, with two lines (tails, label "Hydrophobic Tail") extending downward from each head.
• In the lower row, draw oval - shaped heads at the bottom of each phospholipid, with two lines (tails) extending upward from each head.
• The tails of the upper row and the tails of the lower row should be in contact with each other in the middle, forming the interior of the bilayer, while the heads are on the outer surfaces (top for upper row, bottom for lower row) facing the aqueous environment.)