Question

how do phospholipids contribute to the structure of a cell?
extracellular
phospholipid
bilayer
intracellular
hydrophobic tail
hydrophilic head
a) they provide energy storage for the cell.
b) they form a boundary between the inside and outside of a cell, creating a selectively permeable
c) they act as enzymes to speed up chemical reactions.
a enzyme is a type of protein.
true
false

Explanation:

1. For the phospholipid question: Phospholipids have hydrophilic heads and hydrophobic tails, which self-assemble into a bilayer that forms the cell membrane, a selectively permeable boundary between the cell's interior and exterior. Energy storage is a role of triglycerides, and enzymes are proteins, not phospholipids.
2. For the enzyme question: Enzymes are globular proteins that act as biological catalysts; the statement correctly identifies them as a type of protein.

Answer:

1. B) They form a boundary between the inside and outside of a cell, creating a selectively permeable
2. true