NCERT Solutions for Class 12 Chemistry Chemistry Part-2 Chapter 14

Biomolecules Class 12

Chapter 14 Biomolecules Exercise Solutions

<< Previous Chapter 13 : Amines Next Chapter 15 : Polymers >>

In text : Solutions of Questions on Page Number : 412

Q1 :  

Glucose or sucrose are soluble in water but cyclohexane or benzene (simple six membered ring compounds) are insoluble in water. Explain.


Answer :

A glucose molecule contains five -OH groups while a sucrose molecule contains eight -OH groups. Thus, glucose and sucrose undergo extensive H-bonding with water.

Hence, these are soluble in water.

But cyclohexane and benzene do not contain -OH groups. Hence, they cannot undergo H-bonding with water and as a result, are insoluble in water.

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Q2 :  

What are the expected products of hydrolysis of lactose?


Answer :

Lactose is composed of β-D galactose and β-D glucose. Thus, on hydrolysis, it gives β-D galactose and β-D glucose.

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Q3 :  

How do you explain the absence of aldehyde group in the pentaacetate of D-glucose?


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Q4 :  

The melting points and solubility in water of amino acids are generally higher than that of the corresponding halo acids. Explain.


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Q5 :  

Where does the water present in the egg go after boiling the egg?


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Q6 :  

Why cannot vitamin C be stored in our body?


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Q7 :  

What products would be formed when a nucleotide from DNA containing thymine is hydrolysed?


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Q8 :  

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?


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<< Previous Chapter 13 : Amines Next Chapter 15 : Polymers >>

Exercise : Solutions of Questions on Page Number : 423

Q1 :  

What are monosaccharides?


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Q2 :  

What are reducing sugars?


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Q3 :  

Write two main functions of carbohydrates in plants.


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Q4 :  

Classify the following into monosaccharides and disaccharides.

Ribose, 2-deoxyribose, maltose, galactose, fructose and lactose


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Q5 :  

What do you understand by the term glycosidic linkage?


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Q6 :  

What is glycogen? How is it different from starch?


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Q7 :  

What are the hydrolysis products of (i)sucrose and (ii)lactose?


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Q8 :  

What is the basic structural difference between starch and cellulose?


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Q9 :  

What happens when D-glucose is treated with the following reagents?

(i) HI (ii) Bromine water (iii) HNO3


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Q10 :  

Enumerate the reactions of D-glucose which cannot be explained by its open chain structure.


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Q11 :  

What are essential and non-essential amino acids? Give two examples ofeach type.


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Q12 :  

Define the following as related to proteins

(i) Peptide linkage (ii) Primary structure (iii) Denaturation.


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Q13 :  

What are the common types of secondary structure of proteins?


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Q14 :  

What type of bonding helps in stabilising the -helix structure of proteins?


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Q15 :  

Differentiate between globular and fibrous proteins.


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Q16 :  

How do you explain the amphoteric behaviour of amino acids?


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Q17 :  

What are enzymes?


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Q18 :  

What is the effect of denaturation on the structure of proteins?


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Q19 :  

How are vitamins classified? Name the vitamin responsible for thecoagulation of blood.


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Q20 :  

Why are vitamin A and vitamin C essential to us? Give their important sources.


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Q21 :  

What are nucleic acids? Mention their two important functions.


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Q22 :  

What is the difference between a nucleoside and a nucleotide?


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Q23 :  

The two strands in DNA are not identical but are complementary. Explain.


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Q24 :  

Write the important structural and functional differences between DNA and RNA.


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Q25 :  

What are the different types of RNA found in the cell?


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<< Previous Chapter 13 : Amines Next Chapter 15 : Polymers >>

Chemistry Part-2 - Chemistry : CBSE NCERT Exercise Solutions for Class 12th for Biomolecules will be available online in PDF book form soon. The solutions are absolutely Free. Soon you will be able to download the solutions.

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