Do the following processes require energy when transporting molecules across the cell membrane?
(c) active transport

Identify the type of transport described by each of the following:

a. An ion moves from low to high concentration in the cell.

 Match the lipoprotein (1 to 4) with its description (a to d).

1. chylomicrons

2. VLDL

3. LDL

4. HDL

b. transports most of the cholesterol to the cells

Identify the type of transport (passive diffusion, facilitated transport, or active transport) that will occur for the following molecules:

(b) glucose, no energy required

Identify the type of transport (passive diffusion, facilitated transport, or active transport) that will occur for the following molecules:

(b) nitrogen

Describe the concentration of the solution outside the cell as hypertonic or hypotonic if that solute is being transported across the cell membrane by

(b) facilitated transport.

Which process requires energy—passive or active transport? Why is energy sometimes required to move solute across the cell membrane?

During respiration, oxygen gas diffuses into cells spontaneously. Which type of transport is this?

How would you expect an H⁺ ion to move out of the cell if [H⁺] inside the cell is lower than extracellular fluid?