What is the primary role of enzymes in biological reactions?

• To accelerate the rate of chemical reactions

• To slow down chemical reactions

• To act as reactants in chemical reactions

• To provide energy for reactions

Which model describes the specific binding of a substrate to an enzyme's active site?

• Lock-and-key model

• Fluid mosaic model

• Bohr model

• Induced-fit model

What happens to enzymes at excessively high temperatures?

• They denature and lose their functional shape

• They become more active

• They change their substrate specificity

• They form more enzyme-substrate complexes

What is the role of cofactors in enzyme activity?

• They assist in catalysis

• They inhibit enzyme activity

• They act as substrates

• They denature enzymes

What is feedback inhibition in metabolic pathways?

• The end product inhibits an enzyme involved in its synthesis

• The substrate inhibits the enzyme

• The enzyme inhibits the substrate

• The enzyme is activated by the end product