Enzymes are proteins (except ribozymes which are RNA). They have specific 3D structures with active sites. They catalyze biological reactions. Denatured by heat or extreme pH.
Explanation:
Boron trifluoride (BF₃) has covalent bonds where boron shares three electrons with three fluorine atoms. Although BF₃ can accept a lone pair to form coordinate bonds (as in BF₄⁻), its own bonds are polar covalent. Ionic bonding occurs between metal and non-metal.
Explanation:
Polyethylene (polythene) softens on heating and hardens on cooling, so it is thermoplastic. Bakelite is thermosetting; rubber is elastomer; silk is natural polymer.
Explanation:
In both electrolytic and galvanic cells, oxidation occurs at the anode (AN OX). The anode is positive in electrolytic cells, negative in galvanic. Reduction at cathode (RED CAT). Electroplating: object at cathode, dissolution at anode.
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