The Concentration of Sucrose in Phloem Sap Can Be as High

question 11

Multiple Choice

The concentration of sucrose in phloem sap can be as high as 0.5 M. The loading of sucrose into the phloem sieve tube element

• A) does not require energy.
• B) directly uses the energy supplied by ATP hydrolysis.
• C) is linked to K⁺ movement into the companion cell.
• D) is linked to proton uptake (proton-sucrose symport).
• E) is linked to proton-sucrose antiport.

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