A mutation in an aquaporin gene results in a non-functional protein. Which of the following cellular processes would be MOST directly affected?
Glucose uptake by muscle cells
Sodium transport across nerve cell membranes
Water reabsorption in the kidneys
Calcium storage in the sarcoplasmic reticulum
Related Questions
Facilitated diffusion differs from simple diffusion in that it:
Requires ATP
Moves substances against their concentration gradient
Requires membrane proteins
Occurs only in plant cells
Facilitated diffusion is different from simple diffusion because it:
Moves molecules against the concentration gradient
Uses carrier proteins
Requires ATP
Occurs only in plant cells
In facilitated diffusion, the carrier protein:
Hydrolyzes ATP to move the molecule
Undergoes a conformational change to transport the molecule
Forms a channel that remains permanently open
Transports molecules against their concentration gradient
If two molecules A & B move in the same direction. This movement can be called
Antiport
Symport
Uniport
Guttation
Which of the following is NOT a characteristic of facilitated diffusion?
It requires specific membrane proteins.
It does not require ATP.
It is a passive process.
It moves substances against their concentration gradient.
Active transport differs from facilitated transport as the former
Requires special membrane protein
Is highly selective
Shows response to protein inhibitors
Is ATP dependent
Which type of molecule is LEAST likely to cross a cell membrane by simple diffusion?
Small, nonpolar molecule
Small, polar molecule
Large, polar molecule
Small, uncharged molecule
Read the following statements regarding porins and select the correct option given below
I. Porins are transport proteins
II. Channel proteins are a type of transport protein, which are usually gated
III. Carrier protein binds the particular solute to be transported
IV. Particular solute is delivered to the other side of the membrane by carrier proteins
I, II and III
I, III and IV
I, II, III and IV
I and IV
Which of the following pair is selective and specific mode of transport?
Passive transport and active transport
Passive transport and facilitated diffusion
Facilitated diffusion and active transport
Simple diffusion and facilitated diffusion
Which statement can be shared by facilitated diffusion and active transport?
Both need carrier transporter, which are sensitive to inhibitors that reacts with protein side chains
Energy is required by both the processes
No energy expenditure in these processes
Both use carbohydrates to move molecules
across the membrane
