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NCERT Solutions for Class 12 Chemistry Chapter 14 Biomolecules- It is fascinating to know that the living systems (like humans, plants, animals) are made up of non-living atoms and molecules. These molecules can be very complex as well as simple in nature and are simply known as biomolecules for eg. Carbohydrates, Proteins, Lipids and Nucleic acids, etc. The NCERT solutions for Class 12 Chemistry hapter 14 Biomolecules deals with the characteristics, functions, and structures of biomolecules.
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This chapter holds 4 marks in the CBSE Board exams. In this chapter, there are a total of 8 topic wise questions and 25 questions in the exercise. The NCERT solutions for Class 12 Chemistry Chapter 14 Biomolecules PDF download are presented in a very comprehensive manner. These NCERT solutions help students in their preparation of CBSE boards exams as well as in competitive exams like NEET, JEE Main, etc.
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NCERT Solutions for Class 12 Chemistry Chapter 14 Biomolecules Exercises 14.1 to 14.8
Answer :
We know that water is a polar molecule. It is also known that "like dissolves like". So either polar molecule or the compounds which can form hydrogen bonds with water molecules will get dissolved in water.
Glucose and sucrose have five and eight -OH groups respectively. So they are likely to form hydrogen bonds with molecules with water. In the case of cyclohexane and benzene, these are non-polar molecules because of very low electronegativity difference. So these are not soluble in water.
Question 14.2 What are the expected products of hydrolysis of lactose?
Answer :
The expected product in the hydrolysis of lactose is Galactose and Glucose.
Question 14.3 How do you explain the absence of aldehyde group in the pentaacetate of D-glucose?
Answer :
When pentaacetate of glucose is made to react with hydroxylamine , it does not react indicating the absence of free —CHO group.
In aqueous solution, the cyclic structure (have -OH group at C-1 ) should get converted to open chain structure which has an aldehyde group at C-1. It then should react with hydroxylamine and give glucose oxime. But such case is not observed. This suggests that in aqueous solution open chain structure doesn't exist and as a result, the aldehyde group is absent in pentaacetate of glucose.
Answer :
Amino acids have both acidic and basic group(amine) which lead to the formation of zwitterions and make them dipolar compounds. Due to this property, they form strong molecular bonds themselves and also with water. This result high melting point and good solubility in water as compared to haloacids.
Halo acids doesn't exhibit the property of dipolar compounds. Only carboxyl group of haloacid is involved in H-bonding, not the halogen atom. That's why they have low melting points and less solubility than amino acids.
Question 14.5 Where does the water present in the egg go after boiling the egg?
Answer :
Due to denaturation of proteins, globules unfold and helix gets uncoiled which changes its biological activity. In denaturation, secondary and tertiary structures are destroyed whereas primary structure remains the same.
Due to this process (denaturation of proteins) coagulation of egg take place while boiling. In egg, the globular protein changes into a rubber-like structure which is responsible for absorption of water.
Question 14.6 Why cannot vitamin C be stored in our body?
Answer :
Vitamin C is a water-soluble vitamin which is excreted from the body in the form of urine and cannot be stored. So they must be supplied in the diet regularly.
Question 14.7 What products would be formed when a nucleotide from DNA containing thymine is hydrolysed?
Answer :
When a nucleotide from the DNA containing thymine is hydrolyzed, the products are thymine β-D-2-deoxyribose and phosphoric acid.
Answer :
When RNA is hydrolysed, there is no relationship among the quantities of different bases obtained, this fact suggests that RNA is a single strand structure. Unlike DNA which is a double strand structure in which pairing of bases occurs (for e.g. adenine pairs with thymine). Thus, on hydrolysis, the amount of adenine produced will be the same as the amount produced by thymine. In RNA there is no relationship with quantities of bases, meaning bases don't occur in pairs or it is single strand structure.
Question 14.1 What are monosaccharides?
Answer :
Monosaccharides are the carbohydrates that cannot be hydrolysed further to give simpler units of polyhydroxy aldehyde or ketone. Nearly 20 monosaccharides are known to occur in nature. The general formula of monosaccharides is where, n =3 to 7. Some common examples of monosaccharides are glucose, fructose.
Question 14.2 What are reducing sugars?
Answer :
The carbohydrate which can reduce Fehling’s solution and Tollens’ reagent is referred to as reducing sugar. Also, all monosaccharides whether ketose or aldose are reducing sugars.
Question 14.3 Write two main functions of carbohydrates in plants.
Answer :
The importance of carbohydrates in plants:-
(i) Carbohydrates are used as storage molecules as starch in plants.
(ii) The cell wall of the plants is made up of cellulose
Question 14.4 (1) Classify the following into monosaccharides and disaccharides.
(1) Ribose
Answer :
Ribose is a monosaccharide carbohydrate since it doesn't give simpler units upon hydrolysis.
Question 14.4(2) Classify the following into monosaccharides and disaccharides.
Answer:
It is a monosaccharide carbohydrate because upon hydrolysis it doesn't break into simpler ketone or aldehyde.
Question 14.4(3) Classify the following into monosaccharides and disaccharides.
Answer :
Maltose is a disaccharide carbohydrate i.e., upon hydrolysis it yields two monosaccharide units.
Question 14.4(4) Classify the following into monosaccharides and disaccharides.
Answer :
Galactose is a monosaccharide carbohydrate.
Question 14.4(5) Classify the following into monosaccharides and disaccharides.
Answer :
It is a monosaccharide carbohydrate because upon hydrolysis it doesn't break into simpler compounds of ketone and aldehyde.
Question 14.4(6) Classify the following into monosaccharides and disaccharides.
Answer :
Lactose is a disaccharide carbohydrate since it breaks into two simpler monosaccharide units.
Question 14.5 What do you understand by the term glycosidic linkage?
Answer :
It is the linkage by which two monosaccharide units are joined together by an oxygen atom. This linkage is formed by loss of water molecule.
Question 14.6 What is glycogen? How is it different from starch?
Answer :
Glycogen is a polysaccharide carbohydrate which is stored in the body of animals or human beings. Whenever our body requires glucose (energy), glycogen breaks down to glucose with the help of the enzyme. It is present in liver, brain and muscles. Whereas starch is a polysaccharide carbohydrate stored in plants.
Question 14.7(i) What are the hydrolysis products of
Answer :
Upon hydrolysis sucrose breaks into .
Question 14.7(ii) What are the hydrolysis products of
Answer :
Hydrolysis of lactose gives .
Question 14.8 What is the basic structural difference between starch and cellulose?
Answer :
Cellulose is a long straight-chain polysaccharide made of - D - glucose units and has 1,4 - glycoside linkage.
Whereas starch is made up of 2 components:- Amylose and amylopectin.
Amylose is a long straight chain made of - D - glucose units and joined by 1,4 - glycosidic linkage.
Amylopectin is a branched structure and chains are formed at 1,4 - glycoside linkage and branching occurs at 1.6 - glycosidic linkage.
Question 14.9(i) What happens when D-glucose is treated with the following reagents?
Answer :
When glucose is treated with HI for long time, n - Hexane is formed.
Question 14.9(ii) What happens when D-glucose is treated with the following reagents?
Answer :
Since bromine water is an oxidising agent so it will oxidise aldehyde group to carboxylic acid group. Thus glucose is converted to gluconic acid.
Question 14.9(iii) What happens when D-glucose is treated with the following reagents?
Answer :
On reacting glucose with nitric acid, oxidation takes place and glucose is converted into saccharic acid.
Question 14.10 Enumerate the reactions of D-glucose which cannot be explained by its open chain structure.
Answer :
Below are the few reactions which cannot be explained by the open structure of glucose:-
1. Even if glucose has an aldehyde group, it does not give Schiff’s test and as a result, it does not form the hydrogen sulphite addition product with NaHSO 3 .
2. The pentaacetate of glucose does not react with hydroxylamine, which indicates the absence of free —CHO group.
3. It is found that glucose exists in two different crystalline forms which are named as α and β. This property can only be explained by the cyclic structure of glucose.
Question 14.11 What are essential and non-essential amino acids? Give two examples of each type.
Answer :
The amino acids which are required for the body and can be synthesised in the body are known as non-essential amino acids. E.g Glycine, Alanine. Whereas, the amino acids which are required for our body but cannot be synthesised by our body and should be taken through diet are known as essential amino acids. E.g. Valine, Leucine
Question 14.12(i) Define the following as related to proteins
Answer :
Peptide linkage is an amide bond formed between –COOH group and –NH 2 group. The reaction between two molecules of either different or similar amino acids proceeds by the combination of the amino group of one molecule with the carboxyl group of the other molecule. This will result in the elimination of a water molecule and formation of a peptide bond –CO–NH–.
Question 14.12(ii) Define the following as related to proteins
Answer :
Primary structure of proteins: Each and every polypeptide present in a protein has amino acids linked with each other in a specific sequence and it is this sequence of amino acids that are known to be the primary structure of that protein. Any change in this primary structure that is, the sequence of amino acids creates a different protein.
Question 14.12(iii) Define the following as related to proteins
Answer :
When a protein in its raw form, is subjected to change like change in temperature e.g boiling in hot water or chemical change like a variation in pH, the hydrogen bonds are disturbed. This results in unfolding of globules and uncoiling of the helix and thus protein loses its biological activity. This is called denaturation of the protein .
Question 14.13 What are the common types of secondary structure of proteins?
Answer :
Secondary structures of proteins are found to exist in two types of structure:-
(i) Helix structure:- α-Helix is a way in which a polypeptide chain forms all possible hydrogen bonds by twisting into a right-handed screw or helix with the –NH group of each amino acid and residue hydrogen bonded to the of an adjacent turn of the helix.
(ii) pleated sheet:- In this structure, all peptide chains are stretched out to maximum extension and then laid side by side which is held together by strong intermolecular hydrogen bonds.
Question 14.14 What type of bonding helps in stabilising the a-helix structure of proteins?
Answer :
Hydrogen bonding is the intermolecular bonding which helps in stabilising the -helix structure of proteins. Hydrogen bonds are formed between -NH- of amino acid and of the adjacent turn of helix.
Question 14.15 Differentiate between globular and fibrous proteins .
Answer :
The difference between fibrous protein and globular protein is given below :-
Fibrous Protein | Globular Protein |
When the polypeptide chains run parallel and are held together with the help of hydrogen and disulphide bonds. | In case of a globular protein, the chains of polypeptides coil around and give a spherical shape |
These proteins are generally insoluble in water. | These proteins are generally soluble in water. |
E.g. keratin, myosin | E.g., Insulin, albumins |
Question 14.16 How do you explain the amphoteric behaviour of amino acids?
Answer :
Amino acid has both acidic group and basic group . Thus in aqueous solution, the carboxyl group can lose a proton and the basic group (amine group) can accept a proton. In this way, it forms zwitter ion which can act in both ways i.e., acidic as well as basic. Hence amino acids are amphoteric in nature.
Question 14.17 What are enzymes?
Answer :
Enzymes are the biocatalysts i.e., they catalyse biological reactions. Enzymes are very specific in nature and a particular enzyme can be used for a particular substrate. They are generally named after the name of a compound on which they act. For e.g conversion of maltose to glucose requires enzyme maltase.
Question 14.18 What is the effect of denaturation on the structure of proteins?
Answer :
In denaturation of protein, globules get unfolded and helix gets uncoiled and also globular protein converts into fibrous protein. The primary structure remains the same but secondary and tertiary structure of the protein are destroyed so its biological activity changes.
Question 14.19 How are vitamins classified? Name the vitamin responsible for the coagulation of blood.
Answer :
On the basis of their solubility in water vitamins are classified as:-
Vitamin K is responsible for the coagulation of blood.
Question 14.20 Why are vitamin A and vitamin C essential to us? Give their important sources.
Answer :
Vitamin A:- Sources of this vitamin are carrots, butter and milk. Its deficiency causes Xerophthalmia (hardening of the cornea of the eye).
Vitamin C:- Sources of this vitamin are citrus fruits, amla and green vegetables. Its deficiency causes Scurvy (bleeding gums).
Question 14.21 What are nucleic acids? Mention their two important functions.
Answer :
Nucleic acids are biomolecules found in nuclei of a cell. They are of two types
(i) DNA - Deoxyribonucleic acid
(ii) RNA - Ribonucleic acid.
The two important functions of nucleic acid are:-
(i) DNA present in chromosomes is responsible for heredity by transferring genes.
(ii) Both the nucleic acids are responsible for the protein synthesis in a cell.
Question 14.22 What is the difference between a nucleoside and a nucleotide?
Answer :
Nucleoside | Nucleotide |
1. It has base and sugar. | 1. It has base, sugar and phosphoric acid. |
2. The base is attached to 1 ' position of sugar. | 2. In this, the base is attached to 1' positon and phosphoric acid to 5' position of sugar moiety. |
Question 14.23 The two strands in DNA are not identical but are complementary. Explain.
Answer :
The two strands in DNA are not identical but they held together because they form hydrogen bonds with each other. So they are not identical but complementary to each other. Cytosine forms a hydrogen bond with guanine and adenine forms a hydrogen bond with thymine. SO, that's why the two strands act as a complementary for each other.
Question 14.24 Write the important structural and functional differences between DNA and RNA.
Answer :
Structural differences between DNA and RNA:-
(i) The sugar moiety in DNA is D-2-deoxyribose whereas sugar moiety in RNA is D-ribose.
(ii) DNA contains thymine but it is absent in RNA.
(iii) The helical structure of DNA is double-stranded whereas it is single-stranded in case of RNA.
Functional differences between DNA and RNA:- The main function of DNA is to provide heredity but the main function of RNA is a synthesis of protein in a cell.
Question 14.25 What are the different types of RNA found in the cell?
Answer :
The three types of RNA found in the cell are:-
(i) messenger RNA (m - RNA)
(ii) ribosomal RNA (r - RNA)
(iii) transfer RNA (t - RNA)
More About Biomolecules Class 12 Chemistry Chapter
After completing the NCERT syllabus for Class 12 Chemistry chapter 14 Biomolecules you will be able to explain the characteristics of biomolecules like proteins, carbohydrates, and nucleic acid; classify proteins, carbohydrates, nucleic acid, and vitamins on the basis of their structures; describe the role of biomolecules in biosystem and also able to explain the difference between RNA and DNA. By referring to the NCERT solutions for class 12 , students can understand all the important concepts and practice questions well enough before their examination. Read further to know more about NCERT textbook solutions for Class 12 Chemistry Chapter 14 PDF download.
NCERT Solutions Class 12 Chemistry
Chapter 1 | |
Chapter 2 | |
Chapter 3 | |
Chapter 4 | |
Chapter 5 | |
Chapter 6 | |
Chapter 7 | |
Chapter 8 | |
Chapter 9 | |
Chapter 10 | |
Chapter 11 | |
Chapter 12 | |
Chapter 13 | |
Chapter 14 | Biomolecules |
Chapter 15 | |
Chapter 16 |
14.1 Carbohydrates
14.2 Proteins
14.3 Enzymes
14.4 Vitamins
14.5 Nucleic Acids
14.6 Hormones
If you have a doubt or question that is not available here or in any of the chapters, contact us. You will get all the answers that will help you score well in your exams.
Mostly 1 question is asked from this chapter in JEE mains from the chapter Biomolecules.
For complete solutions : https://school.careers360.com/ncert/ncert-solutions-class-12-chemistry
This chapter holds weightage of 4 Marks in Board exams. Refer to NCERT book and for more questions NCERT exemplar.
Weightage of NCERT class 12 Chemistry chapter 14 in NEET is 3 percent
hello,
Yes you can appear for the compartment paper again since CBSE gives three chances to a candidate to clear his/her exams so you still have two more attempts. However, you can appear for your improvement paper for all subjects but you cannot appear for the ones in which you have failed.
I hope this was helpful!
Good Luck
Hello dear,
If you was not able to clear 1st compartment and now you giving second compartment so YES, you can go for your improvement exam next year but if a student receives an improvement, they are given the opportunity to retake the boards as a private candidate the following year, but there are some requirements. First, the student must pass all of their subjects; if they received a compartment in any subject, they must then pass the compartment exam before being eligible for the improvement.
As you can registered yourself as private candidate for giving your improvement exam of 12 standard CBSE(Central Board of Secondary Education).For that you have to wait for a whole year which is bit difficult for you.
Positive side of waiting for whole year is you have a whole year to preparing yourself for your examination. You have no distraction or something which may causes your failure in the exams. In whole year you have to stay focused on your 12 standard examination for doing well in it. By this you get a highest marks as a comparison of others.
Believe in Yourself! You can make anything happen
All the very best.
Hello Student,
I appreciate your Interest in education. See the improvement is not restricted to one subject or multiple subjects and we cannot say if improvement in one subject in one year leads to improvement in more subjects in coming year.
You just need to have a revision of all subjects what you have completed in the school. have a revision and practice of subjects and concepts helps you better.
All the best.
If you'll do hard work then by hard work of 6 months you can achieve your goal but you have to start studying for it dont waste your time its a very important year so please dont waste it otherwise you'll regret.
Yes, you can take admission in class 12th privately there are many colleges in which you can give 12th privately.
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A career as social media manager involves implementing the company’s or brand’s marketing plan across all social media channels. Social media managers help in building or improving a brand’s or a company’s website traffic, build brand awareness, create and implement marketing and brand strategy. Social media managers are key to important social communication as well.
In a career as a copywriter, one has to consult with the client and understand the brief well. A career as a copywriter has a lot to offer to deserving candidates. Several new mediums of advertising are opening therefore making it a lucrative career choice. Students can pursue various copywriter courses such as Journalism, Advertising, Marketing Management. Here, we have discussed how to become a freelance copywriter, copywriter career path, how to become a copywriter in India, and copywriting career outlook.
Careers in journalism are filled with excitement as well as responsibilities. One cannot afford to miss out on the details. As it is the small details that provide insights into a story. Depending on those insights a journalist goes about writing a news article. A journalism career can be stressful at times but if you are someone who is passionate about it then it is the right choice for you. If you want to know more about the media field and journalist career then continue reading this article.
For publishing books, newspapers, magazines and digital material, editorial and commercial strategies are set by publishers. Individuals in publishing career paths make choices about the markets their businesses will reach and the type of content that their audience will be served. Individuals in book publisher careers collaborate with editorial staff, designers, authors, and freelance contributors who develop and manage the creation of content.
In a career as a vlogger, one generally works for himself or herself. However, once an individual has gained viewership there are several brands and companies that approach them for paid collaboration. It is one of those fields where an individual can earn well while following his or her passion.
Ever since internet costs got reduced the viewership for these types of content has increased on a large scale. Therefore, a career as a vlogger has a lot to offer. If you want to know more about the Vlogger eligibility, roles and responsibilities then continue reading the article.
Individuals in the editor career path is an unsung hero of the news industry who polishes the language of the news stories provided by stringers, reporters, copywriters and content writers and also news agencies. Individuals who opt for a career as an editor make it more persuasive, concise and clear for readers. In this article, we will discuss the details of the editor's career path such as how to become an editor in India, editor salary in India and editor skills and qualities.
Linguistic meaning is related to language or Linguistics which is the study of languages. A career as a linguistic meaning, a profession that is based on the scientific study of language, and it's a very broad field with many specialities. Famous linguists work in academia, researching and teaching different areas of language, such as phonetics (sounds), syntax (word order) and semantics (meaning).
Other researchers focus on specialities like computational linguistics, which seeks to better match human and computer language capacities, or applied linguistics, which is concerned with improving language education. Still, others work as language experts for the government, advertising companies, dictionary publishers and various other private enterprises. Some might work from home as freelance linguists. Philologist, phonologist, and dialectician are some of Linguist synonym. Linguists can study French, German, Italian.
The career of a travel journalist is full of passion, excitement and responsibility. Journalism as a career could be challenging at times, but if you're someone who has been genuinely enthusiastic about all this, then it is the best decision for you. Travel journalism jobs are all about insightful, artfully written, informative narratives designed to cover the travel industry. Travel Journalist is someone who explores, gathers and presents information as a news article.
Welding Engineer Job Description: A Welding Engineer work involves managing welding projects and supervising welding teams. He or she is responsible for reviewing welding procedures, processes and documentation. A career as Welding Engineer involves conducting failure analyses and causes on welding issues.
A quality controller plays a crucial role in an organisation. He or she is responsible for performing quality checks on manufactured products. He or she identifies the defects in a product and rejects the product.
A quality controller records detailed information about products with defects and sends it to the supervisor or plant manager to take necessary actions to improve the production process.
A Product Manager is a professional responsible for product planning and marketing. He or she manages the product throughout the Product Life Cycle, gathering and prioritising the product. A product manager job description includes defining the product vision and working closely with team members of other departments to deliver winning products.
A QA Lead is in charge of the QA Team. The role of QA Lead comes with the responsibility of assessing services and products in order to determine that he or she meets the quality standards. He or she develops, implements and manages test plans.
A metallurgical engineer is a professional who studies and produces materials that bring power to our world. He or she extracts metals from ores and rocks and transforms them into alloys, high-purity metals and other materials used in developing infrastructure, transportation and healthcare equipment.
An Azure Administrator is a professional responsible for implementing, monitoring, and maintaining Azure Solutions. He or she manages cloud infrastructure service instances and various cloud servers as well as sets up public and private cloud systems.
An AWS Solution Architect is someone who specializes in developing and implementing cloud computing systems. He or she has a good understanding of the various aspects of cloud computing and can confidently deploy and manage their systems. He or she troubleshoots the issues and evaluates the risk from the third party.
Careers in computer programming primarily refer to the systematic act of writing code and moreover include wider computer science areas. The word 'programmer' or 'coder' has entered into practice with the growing number of newly self-taught tech enthusiasts. Computer programming careers involve the use of designs created by software developers and engineers and transforming them into commands that can be implemented by computers. These commands result in regular usage of social media sites, word-processing applications and browsers.
A Product Manager is a professional responsible for product planning and marketing. He or she manages the product throughout the Product Life Cycle, gathering and prioritising the product. A product manager job description includes defining the product vision and working closely with team members of other departments to deliver winning products.
Individuals in the information security manager career path involves in overseeing and controlling all aspects of computer security. The IT security manager job description includes planning and carrying out security measures to protect the business data and information from corruption, theft, unauthorised access, and deliberate attack
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