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Which of the following statements about diffusion is true?
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2. Cell Chemistry & Cell Components
Concentration Gradients and Diffusion
0:47 minutiProblema 7
Domanda del libro di testo
A substance moving across a membrane against a concentration gradient is moving by . a. passive transport; b. osmosis; c. facilitated diffusion; d. active transport; e. diffusion
Guida verificata passo dopo passo1
Identify the key concept: A substance moving against a concentration gradient.
Understand that moving against a concentration gradient requires energy input.
Recall that passive transport, osmosis, facilitated diffusion, and diffusion do not require energy.
Recognize that active transport is the process that requires energy to move substances against a concentration gradient.
Conclude that the correct answer involves a process that uses energy to move substances across a membrane.
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Durata del video:
47sConcetti chiave
Ecco i concetti essenziali che devi comprendere per rispondere correttamente alla domanda.
Concentration Gradient
A concentration gradient refers to the difference in the concentration of a substance across a space or membrane. Substances naturally move from areas of higher concentration to areas of lower concentration, a process that is fundamental to understanding transport mechanisms in cells.
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Percorso guidato
04:51
Concentration Gradients and Diffusion
Active Transport
Active transport is the process by which substances move across a cell membrane against their concentration gradient, requiring energy, typically in the form of ATP. This mechanism is crucial for maintaining cellular homeostasis and allowing cells to uptake necessary nutrients even when they are in lower concentrations outside the cell.
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Percorso guidato
02:37Active Transport
Passive Transport
Passive transport is the movement of substances across a cell membrane without the use of energy, occurring along the concentration gradient. This includes processes like diffusion, osmosis, and facilitated diffusion, where molecules move from areas of higher concentration to lower concentration until equilibrium is reached.
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Percorso guidato
05:05Passive vs. Active Transport
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