DNA.

DNA or deoxyribonucleic acid is generally known as genetic material or genome which is most important thing to inherite for the next generations. Physically, DNA is made up by 2 single strands of polymere of nucleotides which called polynucleotide. Each nucleotide is made up by by 3 things, which are pentose or deoxyribose(sugar or monosaccharide), phosphate, and nitrogenous bases. The phosphate group is a link for polymerisation of nucleotide which bonded at 3rd carbon of first deoxyribose ring and link the second sugar ring at 5th carbon to form phosphodiestre bridge and water due to this reaction. So, the line of sugar is a backbone for the strand. In this case, both of the strands have same backbone but have different nitrogenous bases, which exists in purine-pyrimidine pair. Purine and pyrimidine are name group of nitrogenous bases, which are purine has 2 ring structure and pyrimidine has single ring structure. The main groug of nitrogenous bases are consist by Adenine, Thymine, Cytosine and Guanine. Adenine and guanine are recognised by purine bases while thymine and cytosine are recognised by pyrimidine bases. Naturally, adenine always paired with thymine by double hydrogen bonds and cytosine is paired to guanine by triple hydrogen bonds due to the number of existance of electronegative groups at bases's ring. Unlike with RNA strand which has one different base group, which is thymine replaced or converted into uracil during RNA production especially. Otherwise, both strands are bonded in antiparallel which is the structure drawn by upward and downward direction of polymerisation of nucleotide. So, the strands are recognised by 5'(5 prime) and 3'(3 prime). Usually, 5' strand is recognised easily in ring structure drawing which is an oxygen(a functional group) in the ring is upward. In addition, the length of 10 units of nucleotides is 3.4 nm or 3.4 Angstrom. Before a production of a new cell, especially for mitosis and meiosis process are carried out, a replication of chromosome which is derived from DNA occured and the main characteristic DNA in this process is semiconservative. This characteristic was proved by Messelson and Stahl by using the comparison result between 2 isotopes, N14 and N15 which are used during the replication process. N15 is heavier than N14 and detected by radiotion detector.

scary MOVIE

Yesterday,my friend, Maya has told me a story , a real scary story about last Saturday night. Coincidently, a man mudered at last Friday near to her house.
In that night, actually in raining night. She was alone with her cat, Comot, becauseher parents went out of town to visit her sick grandmother and she wanted to stay home due to finish her school project.She told me that she be alone for a first time and always reminds about the murdered guy. She really scared.
Durinng she was finishing her works, she felt uncomfortable and want to forget those guy. So, she decided to make a hot chocolate drink in the kitchen. Suddenly, a loud thunder was bang and followed by weird sound at the kitchen window. the sound continued scratching and made she be more nervous to look after the window.When she looked up the window, alittle hairy hand emerged and scratching around. Her heart then extremely pulsed hader like it'll blow up. She just stared at the hand with shivering body. Then, slowly a hairy tail seen followed by cat's voice. ''What, just a cat'', whispered her in mind. ''Hey, wait a second .Is that Comot''. Then, she ran to the window and looked again after it. ''Ohh...thankgoodness, it's really Comot. I've forgot her''. After that, she graped on it's body and take it inside. ''I'm verry sorry for forgetting you outside'', whispered her again while dried it out with a special towel.
She relieved that nothing bad happened in that night. Then, she continued to finish her works. After apart of project was done, she looked on her watch. ''Oh...no,it's already 11o'clock. I'll miss my favourite show'', said her. She put her pen on the table and ran toward her television, and switch it on. ''Ah...luckily, it's just stated now''. She brang a cup of hot chocolate drink and sat on her sofa. ''Miaw...'', cat's voicing and jump on her lap.
About 30 minutes later, she heard a sound at outside. A sound like many things were fallen by someone. ''Oh...no, what the heck is going around''. She's standing up and the cat ran away into her room. She walked slowly to the front window to peep up what's going here. Then she saw a man walked into her garage and opened it up. ''Is that a thief?'', asked her alone.She wanted to call 999, but the thunder stillbang outside . It was very dangerous to call it up.If she yelled around, her voice not clearly heard by neighbourhood due to heavy rain. So, she decided to go to neighbour's houses to get some helps, but nobody was suitable, except those auntie, Miss Nana. ''I heard that she has a lot of weird phobians'', thought her. Then, she asked her for some helps and she agreed.
They went together to her garage and enter inside it.Suddenly, a big thunder was bang and caused the current blacked out. She was shocked and heard, ''aaahh....''. She saw the auntie had ran away. ''What a weird auntie'', said her and continue to walked in. It was very dark she didn't see anything in there. Then, she smelled an unpleasent smell and reminded about that guy again. Her heart pulsed harder back, with a shivering body and a pair of statued legs. ''Darn it, it's smell like a carcass'', thought her. Afew steps were moving backward and felt like a liquid dropped onto her cheek. ''What is this, it's sticky'', asked her alone. During that time, she only thought about that guy only. It was very terrible and she wanted to cry.
But then, she saw alight and thought, ''what is that. She came neerer and neerer. Suddenly, she felt something big touched on her shoulder and tried to look back. She saw a pair of eyes sharply stared on her. After that, she didn't see anything. After a period, she saw her parents's faces in front of her. ''Am I dreaming'', thought her again and her mother grasped her hand tightly. Then, she saw a stranger emerged behind them with those eyes again. She really scared and got up quickly and said, ''mom,dad why you're not running from those guy?''. ''You've waken up, honey. Relax'', said dad. She blurring. ''this guy is a mechanic that I've asked before to repair the vav.'', said dad again. ''Look your face honey, what a mess'', said mom. She touched her face and thought, ''What, just an oil''.
The mechanic came neerer to her and asked her for hos apologose. She looked his face and reminded back that she'd seem before, in the park with her dad. She went inside her room and her parents laughed to her. ''Such a looser'', she sighed in shame.