Refer to the Graph Showing the Response of a Hydroponic

question 235

Multiple Choice

Refer to the graph showing the response of a hydroponic plant being transferred into a new solution.The dependent variable is the number of phosphate transporters per unit area of root epidermis as a function of time after transfer. Why does the plot line level off after the plant has spent 12 hours in the new solution?

• A) The roots have absorbed all of the phosphate from the solution after 12 hours.
• B) After 12 hours, the activity of the phosphate transporters reaches maximal levels and levels off.
• C) The phosphate that is taken up by the transporters has all been assimilated after 12 hours.
• D) The level of phosphate in the cells has decreased after 12 hours, shutting down transcription of the phosphate transporter genes.
• E) The transcription rate of the phosphate transporter genes goes down after 12 hours, when the roots have adjusted to the phosphate level in the new solution.

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