Reading Quiz 5 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?
an unsaturated fatty acid tail
What is the primary function of carbohydrates attached to the exterior of cell membranes?
identification of the cell
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
In which situation would passive transport not use a transport protein for entry into a cell?
oxygen moving into a cell after oxygen deprivation
How does the sodium-potassium pump make the interior of the cell negatively charged?
by expelling more cations than are 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 whole cells into a cell?
phagocytosis
In what important way does receptor-mediated endocytosis differ from phagocytosis?
It brings in only a specifically targeted substance.
Many viruses enter host cells through receptor-mediated endocytosis. What is an advantage of this entry strategy?
The virus only enters its target host cell type.
Which of the following organelles relies on exocytosis to complete its function?
Golgi apparatus
vacuole
endoplasmic reticulum
mitochondria
Golgi apparatus
Imagine a cell can perform exocytosis, but only minimal endocytosis. What would happen to the cell?
The plasma membrane would increase in size over time.
