If an enzyme is immobilized on a positively-charged support, the net charge of the enzyme will be:

Question

BlackTom AI · Accepted Answer

When an enzyme is immobilized on a positively-charged support, electrostatic interactions come into play. The enzyme, typically a protein, has regions of both positive and negative charge due to the presence of amino acids with various side chains. If the support is positively charged, it will attract the negatively charged regions of the enzyme. This attraction causes a redistribution of charges within the enzyme, making the net charge appear more negative compared to when the enzyme is on a neutral support.

The correct option is 'more negative than the same enzyme on a neutral support'. This is because the positive support will preferentially bind to the negatively charged regions of the enzyme, effectively increasing the net negative charge observed.

In contrast, the option 'more positive than the same enzyme on a neutral support' is incorrect because a positively charged support would repel positive charges on the enzyme, not increase them. The option 'equal to that for the same enzyme on a neutral support' is also incorrect because the interaction with the charged support alters the distribution of charges, changing the net charge compared to a neutral support where no such interactions occur.

If an enzyme is immobilized on a positively-charged support, the net charge of the enzyme will be:单项选择题

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