Review questions Flashcards
Which plasma membrane component can be either found on its surface or embedded in the membrane structure
Protein
Which characteristic of a phospholipid contributes to the fluidity of the membrane
Double bonds in the fatty acid tails
What is the primary function of carbohydrates attached to the exterior of cell membranes
Identification of the cell
A scientist compares the plasma membrane composition of an animal from the Mediterranean coast with one from the Mojave desert form a hypothesis
The cells from the Mojave desert animal will have a higher cholesterol concentration in the plasma membranes
Water moves via osmosis ______.
From an area with a high concentration of water to one of lower concentration
The principal force driving movement in diffusion is
The concentration gradient
What problems faced by organisms that live in freshwater
Their bodies tend to take into much water
How would passive transport not use a transport protein for entry into a cell in a situation
Oxygen moving into a cell after oxygen deprivation
Active transport must function continuously because
Diffusion is constantly moving in solutes In opposite direction
How does the sodium potassium pump make the interior of the cell negatively charged
Bike spelling more cat ions than our taken in
What is the combination of an electrical gradient and a concentration gradient called
Electrochemical gradient
What happens to the membrane of a vesicle after exocytosis
It fuses with and becomes part of the plasma membrane
Which transport mechanism can bring wholesales into a cell
Phagocytosis
And what important way does Receptor mediated endocytosis differ from phagocytosis
It brings in only a specifically targeted substance
Mini viruses enter host cells through receptor mediated endocytosis what is an advantage of this entry stage
The virus only enters its target host cell type
What organelle relies on exocytosis to complete its function
Golgi apparatus
Imagine a cell conform exocytosis but only minimal endocytosis what would happen to the cell
The plasma membrane would increase in size over time
