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Glucose moves into thecell a) with the use of porins b) readily since it is a small uncharged molecule. It simply crosses the cell membrane O c) with the use of a pump protein O d) with the use of a carrier protein

Glucose moves into thecell a) with the use of porins b) readily since it is a small uncharged molecule. It simply crosses the cell membrane O c) with the use of a pump protein O d) with the use of a carrier protein

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
Section: Chapter Questions
Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...
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### Glucose Transport Mechanisms in Cells The movement of glucose into cells involves specific mechanisms. As part of this educational resource, select the correct answer for the following question: **How does glucose move into the cell?** - **a)** with the use of porins - **b)** readily since it is a small uncharged molecule. It simply crosses the cell membrane - **c)** with the use of a pump protein - **d)** with the use of a carrier protein ### Answer Explanation Understanding how glucose moves into cells is essential for comprehending fundamental physiological processes, such as cellular respiration and energy metabolism. Each option listed provides a potential mechanism of glucose transport. 1. **Porins:** Porins are proteins that form large pores in the cell membrane, allowing the passive diffusion of molecules across. However, these are typically found in the outer membranes of gram-negative bacteria and mitochondria, not in the main mechanism for glucose transport in animal cells. 2. **Simple Diffusion:** This is the process through which small, uncharged molecules pass directly through the lipid bilayer of the cell membrane without the aid of proteins. However, glucose is too large and polar to pass through the membrane this way efficiently. 3. **Pump Proteins:** These transport proteins move molecules across the cell membrane against their concentration gradient using energy, often from ATP. This active transport mechanism is not the primary method for glucose uptake. 4. **Carrier Proteins:** Also known as glucose transporters (GLUTs), these proteins utilize facilitated diffusion to move glucose across the cell membrane along its concentration gradient, making option **d** the correct answer. Understanding the correct mechanism is crucial for appreciating cellular transport dynamics and bioenergetics.
Transcribed Image Text:### Glucose Transport Mechanisms in Cells The movement of glucose into cells involves specific mechanisms. As part of this educational resource, select the correct answer for the following question: **How does glucose move into the cell?** - **a)** with the use of porins - **b)** readily since it is a small uncharged molecule. It simply crosses the cell membrane - **c)** with the use of a pump protein - **d)** with the use of a carrier protein ### Answer Explanation Understanding how glucose moves into cells is essential for comprehending fundamental physiological processes, such as cellular respiration and energy metabolism. Each option listed provides a potential mechanism of glucose transport. 1. **Porins:** Porins are proteins that form large pores in the cell membrane, allowing the passive diffusion of molecules across. However, these are typically found in the outer membranes of gram-negative bacteria and mitochondria, not in the main mechanism for glucose transport in animal cells. 2. **Simple Diffusion:** This is the process through which small, uncharged molecules pass directly through the lipid bilayer of the cell membrane without the aid of proteins. However, glucose is too large and polar to pass through the membrane this way efficiently. 3. **Pump Proteins:** These transport proteins move molecules across the cell membrane against their concentration gradient using energy, often from ATP. This active transport mechanism is not the primary method for glucose uptake. 4. **Carrier Proteins:** Also known as glucose transporters (GLUTs), these proteins utilize facilitated diffusion to move glucose across the cell membrane along its concentration gradient, making option **d** the correct answer. Understanding the correct mechanism is crucial for appreciating cellular transport dynamics and bioenergetics.
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