Question

thank you!!

26.2 Mechanisms of Loading of Solutes into Phoem (12 points) During lecture, we went through an example of loading sugars into phloem using secondary active transport. The model below depicts that process. Use the information from lecture and your textbook to identify the correct answers to each labeled structures (letters) or sucrose concentration numbers) indicated in the model. companion Itube T Table 26.2.1 Identify the relative concentration of sucrose in each of the Suid compartments identified by numbers in the image above. Use terms like high, low, or moderate for comparison purposes among the three fluid compartments in the table. Assume this is for the active loading model. 1 point per line/3 points total Number label Fluid compartment? Relative Sucrose concentration Table 26.2.2 Identify the specific protein transporters or complexes used to facilitate movement of sucrose between the different fluid compartments in the image above, and use that information to answer the associated questions in the table below. Assume this is for the active loading model 15 points per le points total Letter Label Name of membrane Direction of sucrose movement protein transporter across the membrane? or complex? Passive or active transport? Page 13 of 15 BIO 152 Priples of Biology Homework 4

B for Table 26.2.2 is not labeled on the image. i think it was a typo on the assignment. thank you so much again!!

Answer 1

Table 26.2.2 Passive or active transport Parive Passive Active symporter Letter Name of membrane/Direction & sucrose label I protein transporter I movement across or complex ? the membrane A SWEET transporter source cell to companion cell sucrose H+ source cell to I companion cell sorbitol companion cell transporter I to sleve tubel Hexose transporter inside companion cell Tonoplast membrane sieve to transporter I sink cell Glucose sieve wall Transporter 1 to sink cell. I Active Passive Passine Passive

Table 26.2.1. I Number lebel | Fluid compartment | Relative sucrose concentrs source cell low 1 companion cell low sieve element High