Water and gases can diffuse across membranes in the direction of their concentration gradients. This is termed
transport.

Question

Water and gases can diffuse across membranes in the direction of their concentration gradients. This is termed 
 transport.

BlackTom AI · Accepted Answer

The question states: Water and gases can diffuse across membranes in the direction of their concentration gradients. This is termed 
 transport. The provided answer is an array containing "passive" and the answer options list is ["空白1"].

Option analysis:
- Option 1: 空白1. This entry is a placeholder in Chinese meaning 'blank 1' rather than a valid term. Since it does not name a type of transport, it cannot be correct as written. In a typical fill-in-the-blank prompt, one would expect the term to be filled into the blank to complete the sentence meaningfully.

Given the scientific concept, the correct term to fill the blank is passive transport, because diffusion of water and gases down their concentration gradient occurs without energy expenditure by the cell.

Why this matters: Diffusion down a gradient is characteristically passive, requiring no input of cellular energy, unlike active transport which moves substances against their gradient and typically uses energy sources like ATP or a proton gradient.

Why other potential misinterpretations can mislead readers: if someone says diffusion is active, that would imply energy use and movement against a gradient, which contradicts the fundamental definition of diffusion driven by concentration differences. If someone suggests merely a generic term like 'facilitated diffusion' or 'osmosis' without context, they could be partially correct in some cases, but the sentence as stated best matches the broad term 'passive transport' for diffusion across membranes.

In summary, the concept described aligns with passive transport for substances moving down their concentration gradients, whereas the given option 空白1 does not provide a valid term to fill the blank.

Water and gases can diffuse across membranes in the direction of their concentration gradients. This is termed transport.未知题型

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