Which of the Following Statements Best Summarizes the Acid Growth

question 45

Multiple Choice

Which of the following statements best summarizes the acid growth hypothesis in an actively growing shoot?

• A) Auxin stimulates proton pumps in the plasma membrane and tonoplast.
• B) Auxin-activated proton pumps lower the pH of the cell wall, which breaks bonds and makes the walls more flexible.
• C) Auxins and gibberellins together act as a lubricant to help stretch cellulose microfibrils.
• D) Auxins activate aquaporins that increase turgor pressure in the cells.

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(1) A clause in an installment contract that provides for all future payments to become due immediately on the failure to tender timely payments or on the occurrence of a specified event. (2) A clause in a mortgage loan contract that makes the entire loan balance become due if the borrower misses or is late making monthly mortgage payments.