Question

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. Transporter proteins and ion channels function in membrane transport by providing a ________1__________ pathway through the membrane for specific polar solutes or inorganic ions. A _________2_________ is highly selective in the solute it transports, binding the solute at a specific site and changing conformation so as to transport the solute across the membrane. For an uncharged molecule, the direction of passive transport across a membrane is determined solely by its ________3__________ gradient. On the other hand, for a charged molecule, the _________4_________ must also be considered. The Na K pump is responsible for maintaining high extracellular sodium ion concentrations. This pump carries out a type of transport called _________5_________ . Group of answer choices 1

Answer 1

Answer:

I believe the answer choices are:

passive, symport, free diffusion, hydrophobic, ion channel, hydrophilic, light-driven, passive transport, facilitated diffusion, concentration, amino acid, membrane potential, active transport, transporter protein, noncovalent, amphipathic.

Transporter proteins and ion channels function in membrane transport by providing a 1. hydrophilic pathway through the membrane for specific polar solutes or inorganic ions. A 2. transporter protein is highly selective in the solute it transports, binding the solute at a specific site and changing conformation so as to transport the solute across the membrane. For an uncharged molecule, the direction of passive transport across a membrane is determined solely by its 3. concentration gradient. On the other hand, for a charged molecule, the 4. membrane potential must also be considered. The Na+/ K+ pump is responsible for maintaining high extracellular sodium ion concentrations. This pump carries out a type of transport called 5. active transport.

Explanation:

• Polar or water soluble solutes can only interact with the hydrophilic domains of transport proteins.
• Transporters, along with permeases and carriers, are a type of membrane transport proteins. Transport proteins bind the solute molecules and undergo conformational changes to transfer the molecule across the membrane.
• Uncharged molecules moves across membranes based on their concentration gradient i.e. the difference of concentration between the intra and extracellular environment. Whereas, charged molecules and ions require a membrane potential to be transported. One example is the Na+/K+ pump.
• Na+/K+ pump is an ATP dependent ion channel that utilizes the enzyme Na+/K+-ATPase to break down ATP into ADP and inorganic phosphates.