12 Questions
What is the primary difference between active and passive transport?
Energy requirements
What type of transport involves moving ions across the membrane against the concentration gradient?
Primary active transport
Which type of transport protein changes shape to allow movement of molecules across the membrane?
Carrier protein
What is the term for the movement of bulk materials into or out of a cell?
Bulk transport
What is the term for a positively charged ion?
Cation
What type of transport is involved in the uptake of mineral nutrients from the soil by plant roots?
Active transport
What is the primary function of the hydrophilic portion of a phospholipid molecule?
To interact with aqueous environments outside the cell
What is the orientation of phospholipid molecules during membrane assembly?
Hydrophobic tails facing inside the cell, hydrophilic heads facing outside the cell
What type of molecule can easily pass through a plasma membrane unaided?
Non-polar molecules
What is the function of the hydrophobic portion of a phospholipid molecule?
To provide structure and support to the cell membrane
What is responsible for the selective permeability of a plasma membrane?
The composition of the phospholipid bilayer
What type of molecules require help to get across the plasma membrane?
Polar molecules
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