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CSIR-NET LIFE SCIENCE NOTE FOR UNIT-1 - C.STABILIZING INTERACTION AND WATER

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UNIT-1 - C.STABILIZING INTERACTION AND WATER                   A.STABILIZING INTERACTIONS- 1.CO-VALENT BONDS - Atoms can become more stable is by sharing electrons (rather than fully gaining or losing them), thus forming  covalent bonds . Covalent bonds are more common than ionic bonds in the molecules of living organisms. For instance, covalent bonds are key to the structure of carbon-based organic molecules like our DNA and proteins. Covalent bonds are also found in smaller inorganic molecules, such as  \text H_2\text O H ​ 2 ​ ​ O H, start subscript, 2, end subscript, O ,  \text {CO}_2 CO ​ 2 ​ ​ C, O, start subscript, 2, end subscript , and  \text {O}_2 O ​ 2 ​ ​ O, start subscript, 2, end subscript . One, two, or three pairs of electrons may be shared between atoms, resulting in single, double, or triple bonds, respectively. The more electrons that are shared between two atoms, the stronger their bond ...

DAY2 DOWNLOAD

                                              DOWNLOAD HERE- (CLICK  ON WATER)                                      WATER BOOK FOR BIO CHEMISTRY- DOWNLOAD HERE-                                                                                                                    LEHLINGER  NELSON COX SOURCE CREDIT-http://www.esalq.usp.br/lepse/imgs/conteudo_thumb/mini/Principles-of-Biochemistry-by-ALbert-Leningher.pdf MORE BOOKS WILL UPDATED SOON!!!!!!!!!!!!!!!!!!!!! ...

1.Multiplication and Division tricks; GENERAL APTITUDE

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1.Multipication tricks- Multiplication by 5 Multiply the number by 10/2 because 5 = 10/2. Examples: 46×5 = 460/2 = 230 106×5 = 1060/2 = 53 27×5 = 270/2 = 135 Multiplication by 25 Multiply the number by 100/4 because 25 = 100/4. Examples: 36×25 = 36×100/4 = 900 64×25 = 64×100/4 = 1600 17×25 = 17×100/4 = 425 Multiplication by 125 Multiply the number by 1000/8 because 125 = 1000/8. Example: 72×125=72×1000/8=9000 112×125=112×1000/8=14000 42×125=42×1000/8=5250 Multiplication of two digit number having same unit digit Let’s understand with the help of an example. Let’s calculate answer of 63 X 43 Step 1:  In the first step multiply unit place digit of both the number it is our last two digits. Step 2:  In the second step multiply 6×4=24, now add 3 in 24 (24+3 = 27), so 27 will be our first two digits. Therefore answer is 2709. Example: 35×75 = 2625 21×31 = 701 Multiplication ...