AP Biology Unit 2 Review Qs

Front

What is the primary difference between the membranes of organelles and the plasma membrane in eukaryotic cells?

Back

The proportions of proteins, lipids, and carbohydrates will vary.

Front

What is passive transport?

Back

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

Front

Give an example of passive transport.

Back

The movement of water from the descending loop of a nephron into the interstitium.

Front

What happens to a vesicle's membrane after exocytosis?

Back

It fuses with and becomes part of the plasma membrane.

Front

What does isotonic mean in terms of saline solutions?

Back

Isotonic solutions have the same solute concentration as the cells, preventing net movement of water.

Front

What occurs if a hypotonic solution is injected into a patient?

Back

Red blood cells may burst due to excess water entering the cells.

Front

According to the fluid mosaic model, where are carbohydrates located in the cell membrane?

Back

Carbohydrates are in contact with the aqueous fluid both inside and outside the cell.

Front

What is the role of phospholipids in cell membranes?

Back

Phospholipids form a bilayer that provides structure and flexibility to the membrane.

Front

Define selective permeability in cell membranes.

Back

Selective permeability is the ability of a membrane to allow certain substances to pass while blocking others.

Front

What is the significance of membrane proteins?

Back

Membrane proteins facilitate transport, act as receptors, and provide structural support.