MCQ
The type of cofactor is:
- AProsthetic group
- BCoenzyme
- CMetal ion
- ✓All of these
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$I.$ It does not help in water conduction.
$II.$ It is also called alburnum.
$III.$ It is dark in colour but very soft.
$IV.$ It has tracheary elements, which are filled with tannin, resin, etc.