Question

2. This question is about transport across membranes. In the kidney, glucose is transported with sodium ions into the proximal convoluted tubule walls via a symporter which is a type of cotransporter. a. The movement described above is an example of secondary active transport. Distinguish between primary and secondary active transport. (2) b. Another well-known cotransporter involving sodium ions is an antiporter that works with primary active transport and uses another ion. Using all the information given, continue Figure 1 below by adding an arrow on each of the two cotransporters and indicate which chemical flows along the drawn arrows: A is the antiporter that uses primary active transport. B is the symporter that uses secondary active transport. Na+ Na+ A B Figure 1: Figure showing two cotransporter systems, an antiporter (A) and a symporter (B) (3) c. Once inside the tubule wall, glucose is then transported into the blood capillaries via GLUT2 transporters along its concentration gradient. What kind of transport is this? (1) d. Points X and Y are two points in a kidney. The water potential in point X was found to be -450 MPa whereas that in point Y was found to be -300 MPa. Fill in the blanks of the following statement: Water travels from point to point by osmosis. (1) (Total: 7 marks)

          2. This question is about transport across membranes.
In the kidney, glucose is transported with sodium ions into the proximal convoluted tubule
walls via a symporter which is a type of cotransporter.
a. The movement described above is an example of secondary active transport.
Distinguish between primary and secondary active transport.
(2)
b. Another well-known cotransporter involving sodium ions is an antiporter that works
with primary active transport and uses another ion. Using all the information given,
continue Figure 1 below by adding an arrow on each of the two cotransporters and
indicate which chemical flows along the drawn arrows:
A is the antiporter that uses primary active transport.
B is the symporter that uses secondary active transport.
Na+
Na+
A
B
Figure 1: Figure showing two cotransporter systems, an antiporter (A) and a symporter (B)
(3)
c. Once inside the tubule wall, glucose is then transported into the blood capillaries via
GLUT2 transporters along its concentration gradient. What kind of transport is this?
(1)
d. Points X and Y are two points in a kidney. The water potential in point X was found to
be -450 MPa whereas that in point Y was found to be -300 MPa. Fill in the blanks of
the following statement:
Water travels from point ____ to point ____ by osmosis.
(1)
(Total: 7 marks)

2. This question is about transport across membranes.
In the kidney, glucose is transported with sodium ions into the proximal convoluted tubule
walls via a symporter which is a type of cotransporter.
a. The movement described above is an example of secondary active transport.
Distinguish between primary and secondary active transport.
(2)
b. Another well-known cotransporter involving sodium ions is an antiporter that works
with primary active transport and uses another ion. Using all the information given,
continue Figure 1 below by adding an arrow on each of the two cotransporters and
indicate which chemical flows along the drawn arrows:
A is the antiporter that uses primary active transport.
B is the symporter that uses secondary active transport.
Na+
Na+
A
B
Figure 1: Figure showing two cotransporter systems, an antiporter (A) and a symporter (B)
(3)
c. Once inside the tubule wall, glucose is then transported into the blood capillaries via
GLUT2 transporters along its concentration gradient. What kind of transport is this?
(1)
d. Points X and Y are two points in a kidney. The water potential in point X was found to
be -450 MPa whereas that in point Y was found to be -300 MPa. Fill in the blanks of
the following statement:
Water travels from point to point by osmosis.
(1)
(Total: 7 marks)

Added by Stephen T.

Question

Please give Ace some feedback