Question
Define the following with an example of each:
- Polysaccharides.
- Denatured protein.
- Essential amino acids.
✓
Answer
- Carbohydrates which yield a large number of monosaccharide units on hydrolysis are called polysaccharides. Starch, cellulose, glycogen and gums are most common examples.
- When native protein is subjected to physical change such as change in temperature or a chemical change such as change in pH, its H-bonds are disturbed. This disturbance unfolds the globules and uncoils the helix. As a result, the protein loses its biological activity.
- Amino acids which cannot be synthesised inside our body and must be obtained through the diet are called essential amino acids. Examples: Valine, leucine, isoleucine.
Need a full question paper?
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Explore more
Similar questions
To coat a layer of $0.004\ mm$ thick Ag on the surface of copper metal whose area is $60 \ cm^2$, it will be necessary to flow a current of $5.0$ ampere in $A g N O _3$ solution, for how much time should it flow? $($Density of silver $=10.5 g \ cm ^{-3}$ and atomic mass of $Ag =108)$
→Write the $\text{IUPAC}$ names of the following coordination compounds:
→- $\ce{[Cr(NH_3)_3cl_3]}$
- $\ce{K3[Fe(CN)_6]}$
- $\ce{[CoBr_2(em)_2]}^+, ($en $=$ ethylenediamine$)$
The decomposition of hydrocarbon follows the equation
$k =\left(4.5 \times 10^{11} s^{-1}\right) e ^{-28000 K / T }$ Calculate Ea.
→$k =\left(4.5 \times 10^{11} s^{-1}\right) e ^{-28000 K / T }$ Calculate Ea.
Two elements $A$ and $B$ form compounds having formula $AB_2$ and $AB_4.$ When dissolved in $20 g$ of benzene $(C_6H_6), 1 g$ of $AB_2$ lowers the freezing point by $2.3 K$ whereas $1.0 g$ of $AB_4$ lowers it by $1.3 K.$ The molar depression constant for benzene is $5.1 K \ \text{kg mol}^{–1}.$ Calculate atomic masses of $A$ and $B.$
→- Explain the following giving suitable examples:
- Sandmeyer’s reaction.
- Coupling reaction of a diazonium salt.
- Explain the observed $K_b$ order:
How would you account for the following?
→- The atomic radii of the metals of the third $(5d)$ series of transition elements are virtually the same as those of the corresponding members of the second $(4d)$ series.
- The E^o value for the $\ce{Mn^{3+}/Mn^{2+}}$ couple is much more positive than that for $\ce{Cr^{3+}/Cr^{2+}}$ couple or $\ce{Fe^{3+}/Fe^{2+}}$ couple.
- The highest oxidation state of a metal is exhibited in its oxide or fluoride.
What product will be formed on reaction of propanal with 2-methylpropanal in the presence of $N a O H$ ? What products will be formed ? Write the name of the reaction also.
→Explain with chemical reactions, the reaction of carboxylic acids with ammonia.
Explain standard hydrogen electrode. (SHE)
Write chemical equations for the following conversions:
- Nitrobenzene to benzoic acid.
- Benzyl chloride to 2-phenylethanamine.
- Aniline to benzyl alcohol.