18 Questions
What type of transport allows the free passage of specific polar molecules?
Facilitated diffusion
Which type of transport involves carrier proteins that bind specific molecules and undergo a conformational change?
Facilitated diffusion
In which type of transport do molecules move through transmembrane protein channels forming a pore that only allows the passage of water molecules?
Simple diffusion
What is the characteristic feature of aquaporins in terms of transporting water molecules compared to simple diffusion?
Faster transport speed
Which type of transport involves the movement of positive charges towards the outside of the membrane to induce channel opening?
Primary active transport
What do carrier proteins in facilitated diffusion bind to on one side of the membrane?
Specific molecules
Which process involves the transport of large molecules across the cell to the opposite domain of the plasma membrane?
Transcytosis
Which type of vesicles are involved in transcytosis and do not fuse with lysosomes?
Caveolae-derived vesicles
Which integral membrane protein coats caveolae involved in transcytosis?
Caveolin
What causes a curvature in the lipid bilayer during caveola formation in transcytosis?
Concentration of caveolin dimers
Which process involves the uptake of selected molecules into small invaginations of the plasma membrane?
Caveolae-mediated endocytosis
During transcytosis, which of the following processes involves endocytosis followed by exocytosis without modification of vesicle contents?
Transcytosis
Which statement accurately describes the mechanism of glucose uptake in epithelial intestinal cells?
Glucose is transported via secondary active transport, coupled with the movement of sodium ions down their electrochemical gradient.
Which of the following statements accurately describes the role of the sodium/potassium pump in the glucose uptake process?
The sodium/potassium pump establishes the electrochemical gradient for sodium ions, which drives the secondary active transport of glucose.
Which of the following transport mechanisms is represented by the process labeled 'F' in the figure?
Facilitated diffusion through a carrier protein
What is the main driving force behind the secondary active transport of glucose in epithelial intestinal cells?
The electrochemical gradient of sodium ions across the cell membrane
Which of the following statements accurately describes the symport mechanism for glucose uptake?
Glucose and sodium ions are transported simultaneously in the same direction across the cell membrane.
Which of the following transport mechanisms directly utilizes ATP as an energy source?
Primary active transport
Test your knowledge on various cellular processes such as turnover of plasma membrane, antigen presentation, recycling of internalized plasma membrane receptors, and delivery of integral membrane proteins. Learn about the mechanisms behind the release of neurotransmitters in exocytosis and transcytosis.
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