Which of the following transport mechanisms is not rate limited by an intrinsic Vmax?Select one:a. Facilitated diffusion via carrier proteinsb. Primary active transport via carrier proteinsc. Secondary co-transportd. Simple diffusion through protein channelse. Secondary counter-transportClear my choice
Question
Which of the following transport mechanisms is not rate limited by an intrinsic Vmax?Select one:a. Facilitated diffusion via carrier proteinsb. Primary active transport via carrier proteinsc. Secondary co-transportd. Simple diffusion through protein channelse. Secondary counter-transportClear my choice
Solution
The answer is d. Simple diffusion through protein channels.
This is because simple diffusion is driven by the concentration gradient of the molecule and is not mediated by carrier proteins. Therefore, it does not have a Vmax, which is a characteristic of carrier-mediated transport mechanisms such as facilitated diffusion and active transport. In these mechanisms, once all the carrier proteins are occupied (saturated), the rate of transport cannot increase, hence the Vmax. In simple diffusion, as long as the concentration gradient exists, the molecules will continue to move from an area of high concentration to an area of low concentration.
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