Chapter 7 wrong q's

Which of the following is a correct difference between active transport and facilitated diffusion?

Active transport requires energy from ATP, and facilitated diffusion does not.

Seawater is hypertonic to cytoplasm in vertebrate cells and in plant cells. If a red blood cell and a plant cell were placed in seawater, what would happen to the two types of cells?

Both cells would lose water; the red blood cell would shrivel, and the plant plasma membrane would pull away from the cell wall.

Which molecule is most likely to passively diffuse across the plasma membrane?

Carbon Dioxide

Cotransport of Solutes across a membrane?

Cotransport proteins allow a single ATP-powered pump to drive the active transport of many different solutes.

Electrogenic Pumps?

Electrogenic pumps create a voltage difference across the membrane

Facilitated Diffusion

It may occur through channel or transport proteins in the membrane

What type of process is Diffusion?

Its a passive process

Carbohydrates associated with the plasma membrane?

Membrane carbohydrates function primarily in cell-cell recognition.

Which of the following statements about the role of phospholipids in the structure and function of biological membranes is correct?

Phospholipids form a selectively permeable structure.

Where is the plasma membrane would cholesterol most likely be found?

The Interior of the membrane

The plasma membrane is referred to as a fluid "mosaic" stucture. Which of the following statements about that model is true?

The fluid aspect of the membrane is due to the lateral and rotational movement of phospholipids and embedded proteins accound for the mosaic aspect

Hypotonic Solution

Water enters the cell

Hypertonic Solution

Water leaves the cell

An isotonic solution gains salt. What will occur as a result?

Water would leave the cell by osmosis, causing the volume of the cytoplasm to decrease.

Which of the following pairs correctly matches a membrane transport process to its primary function?

pinocytosis: the uptake of water and small solutes into the cell by formation of vesicles at the plasma membrane

Which of the following enables a cell to pick up and concentrate a specific kind of molecule?

receptor-mediated endocytosis

Which of the following statements about the sodium-potassium pump is correct?

the sodium-potassium pump moves Na+ and K+ in opposite directions, resulting in a net negative charge inside the cell.