BIOLOGY

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Homework 1 (III term) Cofactor: Its a substance, such as a metalic ion coenzyme, that must be associated with an enzyme for the enzyme to function. Examples: ThDP (thiamine diphosphate), FAD (flavin adenine dinucleotide), CoA (coenzyme A).

Enzyme: Enzymes are biological assitants. enzymes consist of various types of proteins that work to drive the chemical reaction for a specific action or nutrient. Examples:

Ribozyme: Is an RNA molecule that catalyzes a chemical reaction. Examples: L19 (first ribozyme discovered), Hammerhead ribozymes, Hairpin rybozyme.

Vitamin: Its an organic compounnd requiered as a nutrient in tiny amounts by an organism. Examples: Vitamin A - Retinoids, Vitamin B1 - Thiamine.

Joshua Green Aste 8th Milton 

 Reviewed by GL

The UN water group anounced that the day of water would be celebrated by the UN in thursday, 20 march. The water is a chemical substance wich have two hydrogen atoms and one atom of oxygen(H2O). Properties  -The water can be tasteless, odorless and colorless at room temperature. -Water can also change its state to solid, liquid or gas. -It is a powerfull disolvent, dissolving different types of substances like suggar and salt, it can dissolves gases too, like oxigen and carbon dioxide. -Pure water have a low electrical conductivity.

 -[] -http://www.worldwaterday.org/page/1103

Optional assignment (2)**__ Answers: __**
1.1 We would not be able to cure some diseases because the lymphatic system plays many roles in our immune system as the defence of infection. 1.2 The lymphatic system consists of vessels connected to several lymph nodes located throughout drains lymph from all over the body and back into the bloody stream. These lymph nodes act like filter that contain many white blood cells that will destroy the bacteria 2.1 When your immune system goes down so you are more inclined to have a disease that is around you. 2.2 Vaccines have a bit of the virus in a dead form and it is introduce just a bit to our body to attack the virus and then if you get sick any time of that virus your body will recognize it and destroy it. 2.3 He discovered the vaccine to be immune to the virus of polio.

3.1 Because inside the t cells it reproduce and then it starts destroying them and it continue attacking other cells to reproduce, but they don’t reproduce once per day they reproduce million of times per day. 3.2 There are four types of HIV and they are: - Healthy carrier state - The lymphadenopathy syndrome -AIDS-related complex -AIDS or “frank AIDS”, or “full-blown AIDS”.