KE REVIEW ~ UNIT 4

Front

What is the function of the plasma membrane?

Back

The plasma membrane regulates the movement of materials into and out of a cell, maintaining homeostasis.

Front

How do channel and carrier proteins function in the plasma membrane?

Back

Both channel and carrier proteins allow for the flow of molecules into and out of a cell.

Front

What is the role of antibiotics in cellular homeostasis?

Back

Antibiotics interfere with the transport of intracellular and extracellular materials, affecting cellular homeostasis.

Front

What type of cellular transport requires energy?

Back

Active transport requires energy to move substances against their concentration gradient.

Front

What is the significance of the CH2 and phosphate molecular structure in the plasma membrane?

Back

This structure allows a cell to regulate the movement of materials into and out of the cell.

Front

Define active transport.

Back

Active transport is the process by which cells use energy to move substances against their concentration gradient.

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.

Front

Explain the concept of cellular homeostasis.

Back

Cellular homeostasis is the ability of a cell to maintain a stable internal environment despite changes in external conditions.

Front

What is the difference between diffusion and osmosis?

Back

Diffusion is the movement of molecules from an area of high concentration to an area of low concentration, while osmosis specifically refers to the movement of water across a semipermeable membrane.

Front

What are lysosomes and their function?

Back

Lysosomes are organelles that contain enzymes to break down waste materials and cellular debris.