Practice question
Question
PIN proteins are plasma membrane-localized carrier proteins required for polar auxin transport in plants. Four different carrier proteins are shown in the diagram below labeled P1-P4. Arrow indicates the direction of auxin flow. Which among these is most likely to be a PIN protein?
Explanation
The principle of enzyme kinetics explains that substrate binding and catalytic efficiency determine reaction rates. Hence P 4 fits best because it reflects active-site specificity and regulation, as documented in authoritative sources on biochemistry.
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