Question
Write a note on Double Helical structure of DNA.
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Answer
Information regarding the sequence of nucleotides in the chain of a nucleic acid is called its primary structure. Nucleic acids have a secondary structure too.
James Watson and Francis Crick gave a double strand helix structure for DNA. Two nucleic acid chains are wound about each other and held together by hydrogen bonds are formed between specific pairs of bases. Adenine forms hydrogen bonds with thymine where as cytosine forms hydrogen bonds with guanine.
James Watson and Francis Crick gave a double strand helix structure for DNA. Two nucleic acid chains are wound about each other and held together by hydrogen bonds are formed between specific pairs of bases. Adenine forms hydrogen bonds with thymine where as cytosine forms hydrogen bonds with guanine.
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When RNA is hydrolysed, there is no relationship among the quantities of different bases obtained. What does this fact suggest about the structure of RNA?
Explain :
(a) Acetic acid is a weaker acid than formic acid.
(b) Carboxylic acids have higher boiling points than aldehydes of comparable molecular mass.
(a) Acetic acid is a weaker acid than formic acid.
(b) Carboxylic acids have higher boiling points than aldehydes of comparable molecular mass.
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→- Tetra phosphorus decoxide $(P_4O_{10})$
- Ammonium phosphate $(NH_4)_3PO_4$
- SiC
- $I_2$
- $P_4$
- Plastic
- Graphite
- Brass
- Rb
- LiBr
- Si
What happens when:
→- $SO_2$ gas is passed through an aqueous solution $Fe^{3+}$ salt?
- $XeF_4$ reacts with $SbF_5?$
Give examples and suggest reasons for the following features of the transition metal chemistry:
A transition metal exhibits highest oxidation state in oxides and fluorides.
A transition metal exhibits highest oxidation state in oxides and fluorides.
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→State the factors that determine the basicity of alkyl amine compounds in aqueous medium and explain the order of basicity of alkyl amine compounds based on these factors.
$18g$ of glucose, $C_6H_{12}O_6($Molar Mass$=180g\ mol^{-1})$ is dissolved in $1\ kg$ of water in a sauce pan. At what temperature will this solution boil?
$(K_b$ for water $= 0.52\ K\ kg\ mol^{-1},$ boiling point of pure water $= 373.15\ K).$
→$(K_b$ for water $= 0.52\ K\ kg\ mol^{-1},$ boiling point of pure water $= 373.15\ K).$
The following data were obtained during the first order thermal decomposition of $SO_2Cl_2$ at a constant volume:
$SO_2Cl_2(g)\rightarrow SO_2(g) + Cl_2(g)$
Calculate the rate constant.
$($Given: $\log 4 = 0.6021, \log2 = 0.3010)$
→$SO_2Cl_2(g)\rightarrow SO_2(g) + Cl_2(g)$
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Experiment
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Time/s$^{-1}$
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Total pressure/atm
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$1$
$2$
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$0$
$100$
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$0.4$
$0.7$
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$($Given: $\log 4 = 0.6021, \log2 = 0.3010)$
State two main functions of carbohydrates.