A student wrote the following statements about a possible mechanism for loading sucrose from a source.
1. When energy is released from ATP, the released energy is used to move sucrose through a co-transporter protein in the companion cell membrane.
2. As sucrose is moved into a companion cell the pH in the cell wall of the companion cell decreases.
3. Proton pumps in the cell membrane of a companion cell move sucrose into the phloem sieve tube element.
Which statements are correct?
1 )
1, 2 and 3
2 )
1 and 2 only
3 )
1 and 3 only
2 only
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