Question

question 9 (1 point)
if the size of a cell increases when it is placed in an water solution, that solution is said to be
subatomic
isotonic
hypotonic
hypertonic
question 10 (1 point)
describe the structure of the cell membrane.
a double layer of cholesterol molecules and no proteins
a rigid layer of cellulose with embedded carbohydrates
a phospholipid bilayer with embedded proteins, with hydrophobic tails inward and hydrophilic heads outward
a solid protein sheet with no lipids or carbs

Explanation:

• Question 9: When a cell is placed in a hypotonic solution, water moves into the cell by osmosis (since the solute concentration is lower outside the cell compared to inside), causing the cell to increase in size. An isotonic solution has the same solute concentration as the cell, so no net water movement occurs. A hypertonic solution has a higher solute concentration outside the cell, causing water to move out of the cell (cell would shrink). "Subatomic" is not related to solution - cell relationships.
• Question 10: The cell membrane is a phospholipid bilayer. The phospholipids have hydrophobic tails (which face inward) and hydrophilic heads (which face outward). It also has embedded proteins (such as transport proteins, receptor proteins etc.). A double - layer of cholesterol molecules and no proteins is incorrect as cholesterol is a minor component and proteins are present. A rigid layer of cellulose is the cell wall in plant cells, not the cell membrane. A solid protein sheet with no lipids or carbs is incorrect as lipids (phospholipids) are the main structural component of the cell membrane.

Answer:

• Question 9: C. hypotonic
• Question 10: C. a phospholipid bilayer with embedded proteins, with hydrophobic tails inward and hydrophilic heads outward