Plus Two Chemistry Chapter Wise Previous Questions Chapter 14 Biomolecules

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

Question 1.
Which among the give vitamins is water soluble?   [March-2018]
a. A
b. B
c. D
d. E
Answer:
B

Question 2.
State two differences between globular and fibrous proteins.   [March-2018]
Answer:

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

Question 3.
a. Which of the following is a poly­saccharide?
i. Maltose
ii. Sucrose
iii. Fructose
iv. Cellulose
b. Explain the amphoteric behaviour of amino acid. [March-2017]
Answer:
a.iv. Cellulose
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.

Question 4.
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]
Answer:

b. Starch
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.

Question 5.
Carbohydrates are broadly divided into monosaccharides, oligosaccharides and polysaccharides.
a. Write one example each of mono­saccharide and oligosaccharide.
b.
i. Write an one method for the preparation of glucose
ii. What is peptide linkage? [March-2015]
Answer:
a. Monosaccharide: Glucose, Fructose Oligosaccharide:Maltose, Lactose, Sucrose Polysaccharide: Cellulose
b.

1. starch
   Inversion of cane sugar
2. Peptide linkage is an amide formed between -COOH group and -NH₂ group
   (-C-NH-)

Question 6.
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.
a. Starch
b. Protein
c. Nucleic acid [March-2014]
Answer:
a. α-D-glucose. The bond is glycosidic linkage.
b. Amino acid. Peptide bond is the linkage.
c. Nucleotide. Phosphodiester linkage.

Question 7.
a. What are the common type of secondary structure of proteins?
b. Draw the pyranose structure of a-D (+) Glucose.    [Model-2014]
Answer:
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.

Question 8.
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]
Answer:
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
b.

• 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.

Question 9.
a. What is denaturation of proteins ?
b. Give two examples of denaturation.  [June-2012]
Answer:
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.

Question 10.
a. What is the basis of such classification ?
b. Give an example for an oligosabcharide?     [March-2012]
Answer:
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.
b. Sucrose.

Question 11.
a. What are polysaccharides?
b. Give two examples for polysacchari­des.
c. What is invert sugar ? [Model-2012]
Answer:
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.

Question 12.
Give an account of the structure and sha­pe of proteins considering the primary, secondary, tertiary and quaternary levels.       [Say-2011]
Answer:

1. Primary structure: It is the sequence in which the different amino acids are linked to one another.
2. 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.
3. Tertiary structure: The tertiary structure represents over all folding of the polype­ptide chains. This gives rise to fibrous and globular shapes.
4. Quarternary structure: Some proteins have two or more polypeptide chains called Quarternary structure

Question 13.
Names of some carbohydrates, their properties and structural patterns are given below. Match them properly.
[March-2011]

Glucose	Disaccharide	d-1, 4 link
Sucrose	Reducing	Galactoxide
Lactose	Insoluble in water	1, 6-linkage
Amylopectin	Non-reducing	Fructoxide
	Trisaccharide	Anomers present
	Monosaccharide	2-glucose units linked

Answer:

Glucose	Monosaccharide	Anomers present
Sucrose	Non-reducing	Fructoxide
Lactose	Disaccharide	d-1,4 link
Amylopectin	Insoluble in water	1, 6-linkage

Question 14.
What happens when glucose is treated with the following ?
a. Br₂ water
b. HI/Red phosphorus
c. Acetic anhydride [March-2010]
Answer:
a. It turns to gluconic acid.
b. Glucose becomes n-hexane.
c. Glucose penta acetate is formed

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