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B) Rate of transport into the cell A or B 10 20 30 40 Time (min) The graph directly above shows the rate of substance transport over time when the cells that do not contain the compounds A, B, or C, are placed in 1 mM solutions of A, B, and C, respectively. Based upon these data which of the following is/are compatible modes of transport for substance A? (active transport, facilitated diffusion, simple diffusion) For substance B? For substance C?

B) Rate of transport into the cell A or B 10 20 30 40 Time (min) The graph directly above shows the rate of substance transport over time when the cells that do not contain the compounds A, B, or C, are placed in 1 mM solutions of A, B, and C, respectively. Based upon these data which of the following is/are compatible modes of transport for substance A? (active transport, facilitated diffusion, simple diffusion) For substance B? For substance C?

Human Anatomy & Physiology (11th Edition)
Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN:9780134580999
Author:Elaine N. Marieb, Katja N. Hoehn
Publisher:Elaine N. Marieb, Katja N. Hoehn
Chapter1: The Human Body: An Orientation
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### Analysis of Substance Transport Over Time The graph above demonstrates the rate of substance transport into cells over time for three different compounds: A, B, and C. These cells do not initially contain the compounds and are placed in 1 mM solutions of A, B, and C, respectively. #### Graph Details: - **Axes:** - **Y-Axis:** Rate of transport into the cell. - **X-Axis:** Time (minutes). - **Curves:** - Two curves are represented: - A decreasing curve which could be for either substance A or B. - A horizontal line at a consistent rate of transport, represented by substance C. #### Interpretation: - The horizontal line (constant rate) for substance C indicates a mode of transport where the rate does not change over time, suggesting a saturation point where the transport rate remains constant, possibly indicative of facilitated diffusion or another regulated transport mechanism. - The curve for substances A or B shows a decreasing rate over time. This could indicate an initial rapid influx followed by a decrease, suggesting mechanisms like simple diffusion where the gradient might decrease over time as equilibrium is approached, or perhaps facilitated diffusion with a varying rate due to changes in concentration gradients or transporter availability. ### Questions: Based upon these data, answer the following: 1. **For Substance A:** What are the compatible modes of transport for substance A? (Active transport, facilitated diffusion, simple diffusion) 2. **For Substance B:** What are the compatible modes of transport for substance B? 3. **For Substance C:** What are the compatible modes of transport for substance C? ### Key Points: - Substance C's transport rate does not change over time, possibly indicating mechanisms like facilitated diffusion or active transport with a regulatory component. - Substances A and B demonstrate a rate that decreases over time, suggesting mechanisms like simple diffusion where the rate slows as equilibrium is approached. These concepts help in understanding how different substances enter cells and the mechanisms through which cells regulate the transport of various compounds.
Transcribed Image Text:### Analysis of Substance Transport Over Time The graph above demonstrates the rate of substance transport into cells over time for three different compounds: A, B, and C. These cells do not initially contain the compounds and are placed in 1 mM solutions of A, B, and C, respectively. #### Graph Details: - **Axes:** - **Y-Axis:** Rate of transport into the cell. - **X-Axis:** Time (minutes). - **Curves:** - Two curves are represented: - A decreasing curve which could be for either substance A or B. - A horizontal line at a consistent rate of transport, represented by substance C. #### Interpretation: - The horizontal line (constant rate) for substance C indicates a mode of transport where the rate does not change over time, suggesting a saturation point where the transport rate remains constant, possibly indicative of facilitated diffusion or another regulated transport mechanism. - The curve for substances A or B shows a decreasing rate over time. This could indicate an initial rapid influx followed by a decrease, suggesting mechanisms like simple diffusion where the gradient might decrease over time as equilibrium is approached, or perhaps facilitated diffusion with a varying rate due to changes in concentration gradients or transporter availability. ### Questions: Based upon these data, answer the following: 1. **For Substance A:** What are the compatible modes of transport for substance A? (Active transport, facilitated diffusion, simple diffusion) 2. **For Substance B:** What are the compatible modes of transport for substance B? 3. **For Substance C:** What are the compatible modes of transport for substance C? ### Key Points: - Substance C's transport rate does not change over time, possibly indicating mechanisms like facilitated diffusion or active transport with a regulatory component. - Substances A and B demonstrate a rate that decreases over time, suggesting mechanisms like simple diffusion where the rate slows as equilibrium is approached. These concepts help in understanding how different substances enter cells and the mechanisms through which cells regulate the transport of various compounds.
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