Plus Two Chemistry Chapter Wise Previous Questions Chapter 14 Biomolecules is part of Kerala Plus Two Chemistry Chapter Wise Previous Year Questions and Answers. Here we have given Plus Two Chemistry Chapter Wise Questions and Answers Chapter 14 Biomolecules.
Kerala Plus Two Chemistry Chapter Wise Previous Questions and Answers Chapter 14 Biomolecules
Which among the give vitamins is water soluble? [March-2018]
State two differences between globular and fibrous proteins. [March-2018]
|Fibrous Protein||Globular Protein|
|Fibre-like structure||Spherical shape|
|Insoluble in water||Soluble in water|
|The polypeptide chains run parallel||The polypeptide chains are coiled|
a. Which of the following is a polysaccharide?
b. Explain the amphoteric behaviour of amino acid. [March-2017]
b. In aqueous solution, the carboxyl group can lose a proton and amino group can accept a proton, giving rise to a dipolar ion known as switter ion. This is neutrial but contains both positive and negative charges. In switter ionic form. Aminoacids show amphoteric behaviour as they react both with acids and bases.
Cane sugar, Glucose and Starch are Carbohydrates.
a. Represent the structure of Glucose.
b. Write a method to prepare Glucose from Starch. Write the chemical equation of the reaction.
c.Suggest any two uses of Carbohydrates. [March-2016]
c. Carbohydrates are used as storage molecules as starch in plants and glycogen in animals. We build furniture from cellulose in the form of wood and clothe ourselves with cellulose in the form of cotton fibre. They provide raw material for many important industries like textiles, paper, etc.
Carbohydrates are broadly divided into monosaccharides, oligosaccharides and polysaccharides.
a. Write one example each of monosaccharide and oligosaccharide.
i. Write an one method for the preparation of glucose
ii. What is peptide linkage? [March-2015]
a. Monosaccharide: Glucose, Fructose Oligosaccharide:Maltose, Lactose, Sucrose Polysaccharide: Cellulose
Inversion of cane sugar
- Peptide linkage is an amide formed between -COOH group and -NH2 group
Biomolecules are formed by certain specific linkages between simple monomeric units. Write the names of linkages and monomeric units in the following class of biomolecules.
c. Nucleic acid [March-2014]
a. α-D-glucose. The bond is glycosidic linkage.
b. Amino acid. Peptide bond is the linkage.
c. Nucleotide. Phosphodiester linkage.
a. What are the common type of secondary structure of proteins?
b. Draw the pyranose structure of a-D (+) Glucose. [Model-2014]
a.Secondary structure gives the manner in which the polypeptide chains are folded and bent as a result of hydrogen bonding. Two types of secondary structures a-helix structure and p-pleated sheet structure.
a. Amino acids can be classified into essential amino acids and non- essential amino acids.
i. What is the basis of such classification?
ii Write one example each for essential and non-essential amino acids.
b. Write any two differences between DNA and RNA. [March-2013]
a. The amino acids which can be synthesised in the body are known as non-essential amino acids. Those which are not synthesised by our body and must be obtained through died are known as essential amino acids.
Non-essential: Glycine, Alanine Essential: Valine, Lysine
- In DNA the sugar is deoxyribose while in RNA it is ribose.
- DNA is double stranded, RNA is singlestranded but coiled.
- DNA contain thymine whereas RNA contains uracil along with adenine, guanine, cytosine.
a. What is denaturation of proteins ?
b. Give two examples of denaturation. [June-2012]
a.The biological activity of protein is changed when it is subjected to heat, light or chemical reagents. This is denaturation.
b. Coagulation of egg white on boiling and the process by which milk turns curd are examples of denaturation. Carbohydrates are classified into mono-saccharides, oligosaccharides and polysaccharides.
a. What is the basis of such classification ?
b. Give an example for an oligosabcharide? [March-2012]
a. Carbohydrates are classified based on their behaviour on hydrolysis. If a carbohydrate cannot be hydrolysed, they are called monosaccharides. Oligosaccharides give two to tenmonosa-ccharide units on hydrolysis. Polysaccharides give a large number of monosaccharide units on hydrolysis.
a. What are polysaccharides?
b. Give two examples for polysaccharides.
c. What is invert sugar ? [Model-2012]
a. Polysaccharides give a large number of monosaccharide units on hydrolysis.
b. Starch and cellulose.
c. Sucrose solution is dextro rotatory. When it is subjected to hydrolysis, the resultant sugar solution becomes leavorotatory. This sugar is called invert sugar.
Give an account of the structure and shape of proteins considering the primary, secondary, tertiary and quaternary levels. [Say-2011]
- Primary structure: It is the sequence in which the different amino acids are linked to one another.
- Secondary structure: Due to the hydrogen bonds present, the protein molecule may coil up or take up a
(5-pleated structure which is the secondary structure of proteins.
- Tertiary structure: The tertiary structure represents over all folding of the polypeptide chains. This gives rise to fibrous and globular shapes.
- Quarternary structure: Some proteins have two or more polypeptide chains called Quarternary structure
Names of some carbohydrates, their properties and structural patterns are given below. Match them properly.
|Glucose||Disaccharide||d-1, 4 link|
|Lactose||Insoluble in water||1, 6-linkage|
|Monosaccharide||2-glucose units linked|
|Amylopectin||Insoluble in water||1, 6-linkage|
What happens when glucose is treated with the following ?
a. Br2 water
b. HI/Red phosphorus
c. Acetic anhydride [March-2010]
a. It turns to gluconic acid.
b. Glucose becomes n-hexane.
c. Glucose penta acetate is formed
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