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Science Assessment

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Chonchida Poksawas

on 25 February 2014

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Transcript of Science Assessment

The Dodgy Barbeque!
Happy Birthday Chloe!
Chloe invited many guests to her birthday garden party. They celebrated her birthday joyfully, but nobody knew that they would have got food poisoning from beef burgers...
Chloe's dad cooked beef burgers for the guests. Everybody was very hungry, so Chloe's dad cooked the beef burgers quickly.
Unfortunately, Chloe and her guests ate them! This is when salmonella entered the guests' bodies. Many of them realized that beef burgers were only burnt on the outside, but the inside were cold.
Beef burgers were not cooked properly, and so the heat did not kill salmonella. Foods need to be cooked long enough and at a high enough temperature to kill harmful bacteria.
It is cold in the middle!
Heat them through again.
The third way is through bites from animals or insects. Malaria is one example of virus, which you can get through bites from a mosquitoes. Another example is rabies virus, they can enter the body through bites from dogs.
Another way for infectious diseases to get into the body is through cuts. A type of bacteria called Tetanus live in soil. They can get into the body through a cut.
Infectious diseases are also transmitted in contaminated water. There are several types of bacteria and viruses in contaminated water. They can get into the body if you swim in the water or swallow it.
I'm very hungry!
Just wait for a minute........
Ha ha ha! The burgers need to be cooked at above 165 degrees to kill me!
Later on, Chloe's dad put them back on the barbeque to heat them through again.
In this case, the bacteria were in beef burgers. The guests will have got food-poisoning because beef burgers were not cooked properly, so Salmonella in the beef was not killed, or maybe the guests ate them with dirty hands that have not been washed properly.
Infectious diseases are transmitted in droplets in the air. Tiny droplets of liquid from a person, who is infected with the bacterium, contained flu viruses and cold.
A few hours later, some of the guests had bad stomach pain, and a few vomited. By this time, the bacteria had passed barriers, which they must overcome when entering the guests' bodies.
I wonder why i feel sick...
The First Barrier
The second barrier is the stomach acid. The hydrochloric acid in your stomach dissolves food you eat and also kills of the harmful bacteria in your food.
The Third Barrier
The third barrier is the white blood cell. Some white blood cells kill bacteria by moving toward them, then the cell surround the bacteria, and at last they are taken into the white blood cell and killed.
Some white blood cells produce a type of chemical called antibodies. The antibodies attach onto the bacteria and hold on to them. A bacterium may not be able to cause much disease with lots of antibodies on them.
Mouth is the first barrier that the bacteria must get through. Saliva in your mouth contains an enzyme that kills bacteria, but this does not always help, especially with Salmonella.
The Immune System
The immune system is the organs and processes, which protects the body against diseases.

The Second Barrier
White Blood Cell Attacking Bacteria!
Later on the next day, many of the guests were still being sick and had diarrhea. This was the first time that they have got food-poisoning, so it takes a while for the white blood cells to recognize Salmonella.
During the time, when the white blood cells are recognizing the bacteria, Salmonella were dividing themselves in the large intestine. They divided themselves in the large intestine because if they stay in the stomach or in the small intestine, they would have received stomach acid.
Steps of Binary Fission
Different ways in which infectious diseases are transmitted.
After that day, the guests always make sure that their food are clean and have been cooked properly, also they make sure that they wash their hands before eating. But their bodies can now recognize the bacteria, so if the next time Salmonella arrive again, the white blood cell will produce antibodies very quickly.
Step 3
Step 4
After that, the cross wall is created.
Step 5
Finally, they separate from each other and they become two bacterial cells.
Step 1
Step 2
The two chromosomes separate from each other.
Bacterial Chromosome
Bacterial Cell wall
Cell membrane
A copy of chromosome
The chromosome moves to the center, and then the bacteria replicates its chromosome. Now, there are two chromosomes.
Bacterial cell wall
Cell membrane
Bacterial chromosome
Replicated chromosome
When the chromosomes moved apart from each other, it starts to divide itself.
Bacterial chromosome
Replicated chromosome
cell membrane
Bacterial cell wall
The cell starts to divide itself.
Bacterial cell wall
Cell membrane
Replicated chromosome
Bacterial chromosome
A new cell is formed.
I am feeling very ill...
He must go to the hospital!
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