Almost all enzymes are:
| 1. Polysaccharides | 2. Proteins |
| 3. Nucleic acids | 4. Lipids |

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In the absence of carbonic anhydrase in the human body, the reaction between carbon dioxide and water leading to the formation of carbonic acid:
1. Will not occur
2. Will slow down considerably
3. Will get faster
4. Will remain unaltered

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Which of these can have catalytic activity?
| 1. RNA | 2. DNA |
| 3. Prostaglandins | 4. Sterols |

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Enzymes speed up the chemical reactions by:
1. Getting used up in the reaction
2. Formation of different products
3. Converting endothermic reactions to exothermic
4. Lowering activation energy

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