The Mechanisms That Regulate the Loading of Sucrose from the Apoplast

question 4

Multiple Choice

The mechanisms that regulate the loading of sucrose from the apoplast to the sieve- tube members by sucrose- H⁺ symporters are not well understood. Of the following possible regulatory factors, which is least likely to be of direct importance?

• A) sucrose concentration in the apoplast
• B) turgor pressure of sieve- tube members
• C) number of available symporter protein molecules in the plasma membranes of sieve- tube members
• D) density of direct cytoplasmic connections between companion cells and sieve- tube members

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