Below is shown different types of transporter proteins. Assume that both of the

Question

Below is shown different types of transporter proteins. Assume that both of the solutes (shown as small circles and squares) have a higher concentration outside of the cell than inside the cells. Which of the transporters below is mediating passive transport by acting as a uniport? A, B, C, D or E? Which of the following must uses a transporter for active transport using an ATP-driven pump when transporting the solutes in the directions indicated? Name at least one similarity and one difference between the following: transport by a symport and transport by an antiport active transport and transporter-mediated passive transport

Explanation / Answer

Answer:

2.a. A symporter is an integral membrane protein that is involved in movement of two or more different molecules or ions across a phospholipid membrane in the same direction and is a type of cotransporter.

An antiporter is an integral membrane protein involved in secondary active transport of two or more different molecules or ions across a phospholipid membrane in opposite directions.

Similarity: Both symporter and antiporter transports two solutes together across the membrane.

Difference: In antiport two species of ion or other solutes are pumped in opposite directions across a membrane, while in a symport, both the ions are transported together in the same direction.

b. Similarity: Both use ion channels to move ions across the cell membrane, in or out of the cell.

Difference: Transporter mediated passive transport moves ions from high concentration to low, using no metabolic energy. Active Transport moves ions from low concentration to high, using metabolic energy in the form of ATP.

Related Questions

Navigate

• Browse (All)
• Browse B
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.