Phospholipid Bilayer & Transport

Front

What is the primary function of ATP in cellular processes?

Back

ATP provides energy for active transport.

Front

What does it mean for a cell membrane to be selectively permeable?

Back

It means that certain substances can enter the cell while others cannot.

Front

What cellular structure is responsible for maintaining homeostasis by controlling substance entry and exit?

Back

The cell membrane.

Front

Define osmosis in the context of cellular transport.

Back

Osmosis is the movement of water across a membrane.

Front

What type of transport involves the movement of molecules across a membrane with the help of a protein, without the use of energy?

Back

Facilitated diffusion.

Front

What are the two main types of transport across the cell membrane?

Back

Active transport and passive transport.

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 concentration gradient.

Front

What role do phospholipids play in the structure of the cell membrane?

Back

Phospholipids form a bilayer that acts as a barrier to most water-soluble substances.

Front

What is the significance of the fluid mosaic model in understanding cell membranes?

Back

The fluid mosaic model describes the cell membrane as a dynamic structure with various proteins floating in or on the fluid lipid bilayer, allowing for flexibility and functionality.

Front

How do channel proteins facilitate the movement of substances across the cell membrane?

Back

Channel proteins provide a passageway for specific molecules to cross the membrane, often down their concentration gradient.