Question

1. Which of the following statements about Na+ -K+ pump is incorrect?

Select one:

A. The Na+ -K+ pump is an antiport that moves the ions against their concertation gradient.

B. The Na+ -K+ pump is an example of secondary active transport.  

C. The Na+ -K+ pumps potassium against its concentration gradient.

D. The Na+ -K+ pump moves Na+ out of the cell and K+ inside the cell.

E. The Na+ -K+ pumps sodium against its concentration gradient.

2. In general, transport of glucose in and out of cells always occurs down its concentration gradient.

Select one:

A. True  

B. False  

3. Glucose transport in in the interstitial epithelium (from the lumen or cavity to enterocyte) via the SGLTI.

Select one:

A. Is an example of simple diffusion because glucose moves from high concentration in the lumens to low concentration in the enterocyte.

B. Is an example of secondary active transport because glucose uses the sodium of gradient.

C. Is an example of facilitated passive transport because glucose moves from high concentration in the lumen to low concentration in the enterocyte.

D. Is an example of primary active transport that uses a glucose and ATP hydrolysis.

4. Neurotransmitter are synthesized in the cytoplasm of the cell vesicles for storage. Neurotransmitter use a antipode exchanger protein that is proton dependent.

Based on the information above, it can be concluded that   

————.

Hint: this transport is an example of secondary active transport.

A. The PH in the interior of the vesicle is higher than the cytoplasm.

B. The PH in the interior of the vesicle is lower than the cytoplasm.

Answer 1

Hi there, here are your answers.

1. Which of the following statements about Na+ -K+ pump is incorrect?

The correct answer is A. The Na+ -K+ pump is an antiport that moves the ions against their concertation gradient.

Because the sodium-potassium pump is not an antiport, as it involves the movement of these ions against the concentration gradient. An antiport system always involves the movement of two ions across a concentration gradient.

2. In general, transport of glucose in and out of cells always occurs down its concentration gradient.

The correct answer is A. true because glucose is a heavy molecule, a six-carbon sugar that cannot be moved by simple diffusion and thus is transported mainly by facilitated diffusion, always down the gradient.

3. Glucose transport in the interstitial epithelium (from the lumen or cavity to enterocyte) via the SGLTI.

the correct answer is B. Is an example of secondary active transport because glucose uses the sodium of gradient.