Figure 4 25-Compare simple diffusion, passive transport and active transport wit

ID: 149645 • Letter: F

Question

Figure 4 25-Compare simple diffusion, passive transport and active transport with regards to the following (make a table): a. b. c. d. c. Direction of transport relative to the concentration gradient Energy requirement Intrinsic directionality Transport protein requirement Saturation kinetics 26- Explain why it is right to argue that the transport of glucose across the apical membrane of 27-Base on the role of the liver as a regulator of blood glucose, explain the physiologieal importance 28- Some cells have aquaporins (channels that facilitate the flow of water molecules through the intestinal epithelial cells is ultimately powered by ATP hydrolysis. of its glucose transporter being a passive transporter. plasma membrane). For these cells, what regulates the rate and direction of water diffusion across the membrane? a. Aquaporin conformation b. Resting membrane potential c. Solute concentrations on either side of the membrane d. Availability of ATP 29- For each of the following sentences, fill in the blanks with the best word or phrase selected from the list below. Not all words or phrases will be used; each word or phrase should be used only once. A molecule moves down its concentration gradient bytransport, but requires transport to move up its concentration gradient. Transporter proteins and ion channels function in membrane transport by providing a through the membrane for specific polar solutes or inorganic ions. highly selective in the solutes they transport, binding the solute at a specific site and changing conformation so as to transport the solute across the membrane. On the other hand, pathway are discriminate between solutes mainly on the basis of size and electrical charge. Active hydrophilic noncovalent amino acid passiveamphipathic ion channels transporter proteins hydrophobie

Explanation / Answer

Q 25

Characteristics

Simple Diffusion

Active Transport

Passive Transport

A direction of transport relative to the concentration gradient

Molecules move along the Concentration Gradient

The movement of molecules against the concentration gradient

Movement of molecules across the membrane along the concentration gradient from higher to lower

Energy Requirement

No need of energy

Energy required in the Form of ATP

No need of Energy

Intrinsic directionality

No Intrinsic directionality

It has intrinsic directionality

No intrinsic directionality

Transport protein requirement

Not required

Required

Saturation kinetics

Not Exhibits

Some times Exhibits

Exhibits