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Transport of histidine into a bacterial cell was measured at several different histidine concentrations, see table below. Based on these data, is histidine uptake facilitated by a carrier or channel protein? a b Histidine (uM) 2.5 7 с 16 31 72 Select an answer and submit. For keyboard navigation, use the up/down arrow keys to select an answer. A carrier protein because it becomes saturated. A carrier protein because it does not become saturated. A channel protein because it becomes saturated. Transport (uM/min) d A channel protein because it does not become saturated. 42.5 119 240 490 1000 X Your answe

Transport of histidine into a bacterial cell was measured at several different histidine concentrations, see table below. Based on these data, is histidine uptake facilitated by a carrier or channel protein? a b Histidine (uM) 2.5 7 с 16 31 72 Select an answer and submit. For keyboard navigation, use the up/down arrow keys to select an answer. A carrier protein because it becomes saturated. A carrier protein because it does not become saturated. A channel protein because it becomes saturated. Transport (uM/min) d A channel protein because it does not become saturated. 42.5 119 240 490 1000 X Your answe

Biochemistry
Biochemistry
9th Edition
ISBN:9781319114671
Author:Lubert Stryer, Jeremy M. Berg, John L. Tymoczko, Gregory J. Gatto Jr.
Publisher:Lubert Stryer, Jeremy M. Berg, John L. Tymoczko, Gregory J. Gatto Jr.
Chapter1: Biochemistry: An Evolving Science
Section: Chapter Questions
Problem 1P
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**Title: Investigation of Histidine Transport in Bacterial Cells** **Text:** The transport of histidine into bacterial cells was studied at various histidine concentrations. The data below show the measurements of histidine uptake. Based on this data, determine if histidine uptake is facilitated by a carrier or channel protein. **Data Table:** | Histidine (µM) | Transport (µM/min) | |----------------|--------------------| | 2.5 | 42.5 | | 7 | 119 | | 16 | 240 | | 31 | 490 | | 72 | 1000 | **Question:** Select an answer and submit. For keyboard navigation, use the up/down arrow keys to select an answer. a) A carrier protein because it becomes saturated. b) A carrier protein because it does not become saturated. c) A channel protein because it becomes saturated. d) A channel protein because it does not become saturated. *Note: The selected answer in this exercise was option c, which is incorrect.* **Analysis:** The data suggest saturation occurs as the concentration of histidine increases, indicating that the transport is facilitated by a carrier protein. Carrier proteins typically show saturation kinetics because they rely on binding sites that can become fully occupied.
Transcribed Image Text:**Title: Investigation of Histidine Transport in Bacterial Cells** **Text:** The transport of histidine into bacterial cells was studied at various histidine concentrations. The data below show the measurements of histidine uptake. Based on this data, determine if histidine uptake is facilitated by a carrier or channel protein. **Data Table:** | Histidine (µM) | Transport (µM/min) | |----------------|--------------------| | 2.5 | 42.5 | | 7 | 119 | | 16 | 240 | | 31 | 490 | | 72 | 1000 | **Question:** Select an answer and submit. For keyboard navigation, use the up/down arrow keys to select an answer. a) A carrier protein because it becomes saturated. b) A carrier protein because it does not become saturated. c) A channel protein because it becomes saturated. d) A channel protein because it does not become saturated. *Note: The selected answer in this exercise was option c, which is incorrect.* **Analysis:** The data suggest saturation occurs as the concentration of histidine increases, indicating that the transport is facilitated by a carrier protein. Carrier proteins typically show saturation kinetics because they rely on binding sites that can become fully occupied.
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