Phospholipid Bilayer & Transport

Front

What is the structure of a phospholipid?

Back

A phospholipid consists of a hydrophilic (water-loving) head and two hydrophobic (water-fearing) tails, forming a bilayer in cell membranes.

Front

What role do channel proteins play in the phospholipid bilayer?

Back

Channel proteins facilitate the transport of specific substances across the cell membrane without the use of energy.

Front

What is facilitated diffusion?

Back

Facilitated diffusion is a passive transport process that allows substances to cross membranes with the assistance of special proteins, without the need for energy.

Front

What is the primary function of the cell membrane?

Back

The cell membrane regulates what enters and exits the cell, providing protection and structural support.

Front

Define hydrophobic. What does it mean in the context of phospholipids?

Back

Hydrophobic refers to substances that repel water. In phospholipids, the tails are hydrophobic, preventing water from passing through easily.

Front

Define hydrophilic. What does it mean in the context of phospholipids?

Back

Hydrophilic refers to substances that attract water. In phospholipids, the heads are hydrophilic, allowing them to interact with the aqueous environment.

Front

What is the difference between active transport and passive transport?

Back

Active transport requires energy to move substances against their concentration gradient, while passive transport does not require energy and moves substances along their gradient.

Front

What are glycoproteins and their function in the cell membrane?

Back

Glycoproteins are proteins with carbohydrate chains attached. They play a role in cell recognition and signaling.

Front

What is the significance of the fluid mosaic model?

Back

The fluid mosaic model describes the cell membrane as a flexible structure with various proteins embedded, allowing for movement and interaction.

Front

What is exocytosis?

Back

Exocytosis is the process by which cells expel materials in vesicles that fuse with the cell membrane.