What happens to the speed of a chemical reaction when a catalyst is present

Compare the depth of field when focusing with low power and high power. which power has the greater depth of field?

What is the main function of the central vacuole in a plant cell? a. absorbs energy from the sun to produce food b. holds water and maintains turgor pressure c. breaks down molecules to release energy d. contains the cell's genetic material

What is the main fuel source for the work of the cell