Question 15 Marks
Attempt any five of the following:
$(a)$ What are Purines and Pyrimidines? Name the purines and Pyrimidines present in $\text{DNA}$ and $\text{RNA}$ nucleic Acids.
$(b)$ Write the full forms of $\text{DNA}$ and $\text{RNA}$.
$(c)$ Name the vitamin whose deficiency causes convulsions.
$(d)$ Which vitamin B group can be stored in our body?
$(e) (i)$. What is the difference between a nucleoside and nucleotide?
$(ii).$ Write one difference between a-helix and $ẞ-$pleated sheet structures of protein.
$(f)$ What are nucleic acids? Why two strands in $\text{DNA}$ are not identical but are complementary?
$(g)$ Some enzymes are named after the reaction, where they are used. What name is given to the class of enzymes which catalyse the oxidation of one substrate with simultaneous reduction of another substrate?
$(a)$ What are Purines and Pyrimidines? Name the purines and Pyrimidines present in $\text{DNA}$ and $\text{RNA}$ nucleic Acids.
$(b)$ Write the full forms of $\text{DNA}$ and $\text{RNA}$.
$(c)$ Name the vitamin whose deficiency causes convulsions.
$(d)$ Which vitamin B group can be stored in our body?
$(e) (i)$. What is the difference between a nucleoside and nucleotide?
$(ii).$ Write one difference between a-helix and $ẞ-$pleated sheet structures of protein.
$(f)$ What are nucleic acids? Why two strands in $\text{DNA}$ are not identical but are complementary?
$(g)$ Some enzymes are named after the reaction, where they are used. What name is given to the class of enzymes which catalyse the oxidation of one substrate with simultaneous reduction of another substrate?
Answer
View full question & answer→Attempt any five of the following:
$(i)$ Pyrimidines: These are three bases derived from pyrimidines. These are cytosine $(C)$, thymine $(T)$ and uracil $(U)$.In $\text{DNA}, T$ is present but in $\text{RNA}$, U is present.
Purines: There are two bases derived from purine. These are adenine $(A)$ and guanine $(G)$.
In $\text{DNA}$, Purines present are Adenine $(A)$ and Guanine $(G)$ and Pyrimidines present are Cytosine $(C)$ and Thymine $(T)$ while in $\text{RNA}$, Purines are the same while Pyrimidines present in $\text{RNA}$ includes Cytosine $(C)$ and Uracil $(U)$.
$(ii)$
$\text{DNA}\rightarrow $ Deoxyribonucleic acid
$\text{RNA} \rightarrow $ Ribonucleic acid
$(iii) B_6 /$ Pyridoxine
$(iv)$ Vitamin $B^{12}$ can be stored in our body.
$(v)$ i. Nucleoside: It is formed when pentose sugar combines with nitrogen base.
Nucleotide: When nucleoside bonds with phosphate group.
ii. \alpha $-$helix has intramolecular hydrogen bonding while $\beta-$pleated has intermolecular hydrogen bonding / $\alpha -$helix results due to regular coiling of polypeptide chains while in $\alpha -$pleated all polypeptide chains are stretched and arranged side by side.
$(vi)$Nucleic acids are polymers of Nucleotides.
Because the $H-$bonds are formed between specific pairs of bases/pairing between $A \ T$ and between $C \ G.$
$(vii)$ Enzyme oxidoreductase, the ending of name of an enzyme is -ase.
$(i)$ Pyrimidines: These are three bases derived from pyrimidines. These are cytosine $(C)$, thymine $(T)$ and uracil $(U)$.In $\text{DNA}, T$ is present but in $\text{RNA}$, U is present.
Purines: There are two bases derived from purine. These are adenine $(A)$ and guanine $(G)$.
In $\text{DNA}$, Purines present are Adenine $(A)$ and Guanine $(G)$ and Pyrimidines present are Cytosine $(C)$ and Thymine $(T)$ while in $\text{RNA}$, Purines are the same while Pyrimidines present in $\text{RNA}$ includes Cytosine $(C)$ and Uracil $(U)$.
$(ii)$
$\text{DNA}\rightarrow $ Deoxyribonucleic acid
$\text{RNA} \rightarrow $ Ribonucleic acid
$(iii) B_6 /$ Pyridoxine
$(iv)$ Vitamin $B^{12}$ can be stored in our body.
$(v)$ i. Nucleoside: It is formed when pentose sugar combines with nitrogen base.
Nucleotide: When nucleoside bonds with phosphate group.
ii. \alpha $-$helix has intramolecular hydrogen bonding while $\beta-$pleated has intermolecular hydrogen bonding / $\alpha -$helix results due to regular coiling of polypeptide chains while in $\alpha -$pleated all polypeptide chains are stretched and arranged side by side.
$(vi)$Nucleic acids are polymers of Nucleotides.
Because the $H-$bonds are formed between specific pairs of bases/pairing between $A \ T$ and between $C \ G.$
$(vii)$ Enzyme oxidoreductase, the ending of name of an enzyme is -ase.
