A student carried out an investigation using amylase from a saprophytic fungus. Six wells (holes) of the same size were cut in a starch agar plate. Each well was filled with the same
concentration and volume of amylase solution. An equal volume of buffer solution was added to
produce a different pH in each well. The plates were incubated at 25°C for 4 hours and then
covered with iodine solution. It was observed that there were clear rings around each well. The
width of these clear rings is shown in the table.
pH
Width of clear ring
/ mm
4
1
5
2
6
6
7
11
8
9
9
3
i)
What conclusion can be drawn from the results?
1) Use an appropriate method to estimate the maximum rate of reaction that was observed in
this investigation. Show your working
Maximum rate of reaction

4.) metal

"-the movement of carbon from the nonliving environment into living things and back to the environment

-carbon is the essential component of proteins, fats, and carbohydrates (which make up all organisms)

-carbon exists in air, water, and living organisms

-producers convert carbon dioxide in the atmosphere into carbohydrates during photosynthesis

-bacteria in the atmosphere cycles through the system in filtration units

-in cellular respiration, carbon is released back into the atmosphere as carbon dioxide

-some carbon is stored in limestone (forming one of the largest "carbon sinks" on earth)

-largest carbon reservoir on earth= limestone

-carbon stored in the bodies of organisms as fat, oils, or other molecules may be released into the soil or air when the organism dies

-this may form deposits of coal, oil, or natural gas (fossil fuels, which increased the atmospheric carbon dioxide)

-fossil fuels store carbon left over from bodies of organisms that died millions of years ago

-they are located in the surface of earth, deep within the earth and beneath the ocean floor."    

because photosynthesis could not occur (apex)