AP Biology Unit 2 Test

Front

What is an integral protein?

Back

Integral proteins are proteins that are permanently attached to the biological membrane and can span across the membrane, playing key roles in transport and communication.

Front

What is the primary function of aquaporins?

Back

Aquaporins are specialized channel proteins that facilitate the transport of water across cell membranes.

Front

Describe the pathway for an enzyme secreted by pancreatic cells.

Back

The pathway is: Endoplasmic Reticulum (ER) -> Golgi apparatus -> vesicles that fuse with the plasma membrane.

Front

Which type of molecules can easily pass through the cell membrane?

Back

Small nonpolar molecules can pass through the cell membrane most easily due to their size and lack of charge.

Front

What is the role of aquaporins in cells?

Back

Aquaporins serve as water channel proteins that allow for the rapid transport of water across cell membranes.

Front

Define passive transport.

Back

Passive transport is the movement of molecules across a cell membrane without the use of energy, typically along the concentration gradient.

Front

What is facilitated diffusion?

Back

Facilitated diffusion is a type of passive transport that uses transport proteins to help move molecules across the membrane.

Front

What is the function of the Golgi apparatus?

Back

The Golgi apparatus modifies, sorts, and packages proteins and lipids for secretion or delivery to other organelles.

Front

Explain the concept of selective permeability in cell membranes.

Back

Selective permeability refers to the ability of a cell membrane to allow certain substances to pass while blocking others, maintaining homeostasis.

Front

What are the main components of the cell membrane?

Back

The main components of the cell membrane are phospholipids, proteins, cholesterol, and carbohydrates.