Temperature and enzymatic activity Grade 9 students posed the following question: "What is the convenient temperature for the activity of an enzyme?" For this reason, they realized the experiment described below: -They put the same quantity of cooked starch in each of the two test tubes A and B. -They added a small quantity of fresh saliva to each of the two tubes. -Then, they placed both tubes for a convenient duration at different temperatures: •Tube A in ice where the temperature is 0°C Tube B in a water bath where the temperature is 37°C. N.B.: Saliva contains an enzyme: amylase. The chemical medium is neutral in both tubes A and B. By using an appropriate technique, these students obtained the results shown in the Quantity of cooked starch (in 6) opposite document. 1- Represent, in the same table, the variation of the quantities of cooked starch in the tubes A and B in function of time. 2- Pick out the posed problem by grade 9 students. 3- Analyze the obtained results. What do you conclude? 100 Tube A 75 50 Tube B Time (in min) 10 15

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Bacterial Morphology

The bacteria are prokaryotic organisms that are single-celled, and are found to exist as free-living and possess a microscopic size. The morphology is found to vary in the bacteria, where some of them are identified as individual organisms and the others are detected as colonies. The size and shape of the bacterial cell also represent its morphology. 

Bacterial cell structure

Bacteria are single-celled, tiny creatures that may enter healthy tissues and grow rapidly. Bacteria are microscopic organisms that are tiny and unicellular. These are members of the prokaryote kingdom. They live in water, air, soil, and all-natural environments. They are used in industrial and therapeutic processes, and they support a wide range of plant and animal life. The first organism to appear on the planet. Bacteria-like creatures are the oldest known fossils. Bacteria can consume a wide range of organic and inorganic elements, and some may even survive in harsh conditions.