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13 Dec 2019

Which of the following transport steps in an intestinal epithelial cell can, under certain conditions, occur against a concentration gradient? (uptake refers to "into the cell", export: "out of the cell")

a. uptake of glucose

b. export of glucose

c. uptake of Na+ at the basolateral plasma membrane

d. uptake of Na+ at the apical plasma membrane

e. export of K+

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17 Dec 2019
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Related questions

TRUE OR FALSE FOR 31-36

31. GLUTs are uniporters that use ATP hydrolysis for energy.

32. GLUT1 transports glucose across the blood brain barrier.

33. GLUT2 initially transports glucose into the pancreas after eating, allowing insulin to be released into the bloodstream.

34. After insulin signaling, GLUT4 is transported to the membrane of various cells to increase glucose transport in tissues (But not if you have Type II Diabetes).

35. If the plasma membrane of an animal cell was made entirely permeable to Na+, the Na+/K+pump would continue to pump ions and hydrolyse ATP, but not build a Na+gradient.

36. Passive carriers are localized to the basolateral membrane of epithelial cells, activate transporters are localized to the apical membrane.

1- Which of the following examples involves active transport?

a)

Release of calcium stored at high concentrations in the endoplasmic reticulum into the cytoplasm.
b)

Sodium ions (Na+) flowing into a cell through a channel protein.
c)

Transporting calcium out of a cell into an solution rich in calcium.
d)

Uptake of a hydrophobic dye newly placed in a solution by cells living in the solution.

2- Chemical analysis of a cellular membrane would normally reveal the presence of

A) sugars

B) proteins

C) lipids

D) nucleic acids

E) A, B and C

3- If you place a culture of animal cells into a container filled with molecules of red dye that have a strong negative charge, and the dye ends up inside the cell, what is the most likely explanation for the uptake?

a)

osmosis
b)

active transport
c)

pinocytosis
d)

phagocytosis
e)

exocytosis

Q1. Both neurons and epithelial cells can sometimes be joined to neighboring cells via gap junctions
a. TRUE
b. FALSE

Q2. Which of the following transport proteins is important for maintaining the electrical gradient across the plasma membrane of a neuron?
a. Facilitated transport proteins
b. Voltage-gated Na+ channel
c. Na+/K+ ATPase
d. Na+/glucose symporter SGLT1

Q3. During an action potential, Na+ influx______ the membrane potential, and K+ efflux subsequently ______ the membrane potential.
a. Depolarizes; repolarizes
b. Hyperpolarizes; depolarizes
c. Repolarizes; depolarizes
d. Polarizes; hyperpolarizes

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