Week 12 Flashcard (11/01/24)

Front

What is the structure of a phospholipid bilayer?

Back

The phospholipid bilayer consists of two layers of phospholipids, with hydrophilic (water-attracting) heads facing outward and hydrophobic (water-repelling) tails facing inward.

Front

How many layers are in the phospholipid bilayer?

Back

2

Front

What happens to water when a 10% sugar solution in a rubber tube is placed in a 5% sugar solution?

Back

More water will enter the rubber tube than leave it due to osmosis.

Front

What part of a phospholipid is hydrophobic?

Back

The lipid 'tails' are hydrophobic.

Front

What is pinocytosis?

Back

Pinocytosis is a form of endocytosis where the cell engulfs liquid substances.

Front

What is the difference between exocytosis and endocytosis?

Back

Exocytosis is the process of expelling materials from the cell, while endocytosis is the process of taking materials into the cell.

Front

What is osmosis?

Back

Osmosis is the movement of water across a semi-permeable membrane from an area of lower solute concentration to an area of higher solute concentration.

Front

What role do semi-permeable membranes play in cellular processes?

Back

Semi-permeable membranes allow certain substances to pass while blocking others, facilitating selective transport.

Front

What is the significance of the hydrophobic and hydrophilic regions in phospholipids?

Back

The hydrophobic tails and hydrophilic heads create a barrier that separates the internal environment of the cell from the external environment.

Front

What is the function of the phospholipid bilayer in cells?

Back

The phospholipid bilayer serves as a barrier to protect the cell and regulates the movement of substances in and out of the cell.