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NCERT Books Free Download for Class 12 Chemistry Chapter 14 - Biomolecules

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Last updated date: 29th May 2024
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NCERT Books for Class 12 Chemistry Chapter 14 - Free PDF Download

Free NCERT Books download for Class 12 Chemistry Chapter 14 - Biomolecules on Vedantu.com. Students can also download the NCERT Textbooks Solutions in PDF for Class 6 to 12 all subjects. Register for Chemistry tuition to clear your doubts and score more in your exams.

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Class 12 Chemistry Chapter 14 NCERT Books - Biomolecules

Description of Chapter 14 Biomolecules of Class 12 Chemistry:

Chapter 14 of the Biomolecules part of the Class 12 Chemistry textbook talks about DNA and RNA. DNA is a long, spiral-shaped double helix composed of nucleotide subunits, each composed of a sugar molecule called deoxyribose and one of four nitrogenous bases—adenine (A), thymine (T), cytosine (C), or guanine (G). Given the complementary pairing of nucleotides—A with T and C with G—the nucleotide subunits in DNA can pair in two ways to form base pairs. If the bases are oriented so that their hydrogen-bonding sites match up, they form an antiparallel (also called Watson-Crick) base pair. If the bases are inverted so that their sugar-phosphate backbones overlap, the result is a parallel (also called Hoogsteen or anti-Hoogsteen) base pair.

The DNA double helix is held together by weak bonds between the bases. There are hydrogen bonds between single strands of DNA, and there are also intermolecular interactions that take place between two adjacent strands.

DNA contains several types of nucleotide subunits, some of which can combine to form RNA molecules, including the ribonucleotides uridine (U), adenosine (A), guanosine (G), and inosine (I).

The environmental temperature determines the structure of an RNA molecule. The A-form of RNA shows two intertwining base pairs with a single unpaired sugar molecule between them. It is found in hot temperatures or solutions with high salt concentrations. The B-form is found at lower temperatures or in mild solutions.

Ribosomes are cellular organelles that make proteins.

How to prepare For CBSE Class 12 Chemistry Chapter 14

Before you start your preparation for CBSE Class 12 Chemistry Chapter 14, it is important to understand what the CBSE Board wants to test.

CBSE wants you to demonstrate the knowledge of topics like - chemical kinetics, hydrocarbons, diffusion and osmosis, acid-base equilibria.

We know that chemistry can be a tough subject but this blog post will help you prepare for this chapter with concise yet detailed notes on how major concepts are covered in this chapter.

This article is not all-inclusive; it is designed to be a summary of all the topics touched in Chapter 14 of CBSE Text Book, IBSSB Chemistry.

FAQs on NCERT Books Free Download for Class 12 Chemistry Chapter 14 - Biomolecules

1. How to download Class 12 Chemistry Chapter 14 NCERT Book for CBSE?

Students can download it from Vedantu. On this page, Students can download Class 12 Chemistry Chapter-14 PDF Solutions of the Book.

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

As a result of denaturation, globules get unfolded and helices get uncoiled. Secondary and tertiary structures of the protein are destroyed, but the primary structures remain unaltered. It can be said that during denaturation, secondary and tertiary-structured proteins get converted into primarily structured proteins. Also, as the secondary and tertiary structures of a protein are destroyed, the enzyme loses its activity

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

The deficiency of vitamin A leads to xerophthalmia (hardening of the cornea of the eye) and night blindness. The deficiency of vitamin C leads to scurvy (bleeding gums) The sources of vitamin A are fish liver oil, carrots, butter, and milk. The sources of vitamin C are citrus fruits, amla, and green leafy vegetables.

4. What are nucleic acids? 

Nucleic acids are biomolecules found in the nuclei of all living cells, as one of the constituents of chromosomes. There are mainly two types of nucleic acids: deoxyribonucleic acid (DNA) and ribonucleic acid (RNA). Nucleic acids are also known as polynucleotides as they are long-chain polymers of nucleotides

5. What are the two important functions of nucleic acids?

Two main functions of nucleic acids are:

  • DNA is responsible for the transmission of inherent characters from one generation to the next. This process of transmission is called heredity.

  •  Nucleic acids (both DNA and RNA) are responsible for protein synthesis in a cell. Even though the proteins are synthesized by the various RNA molecules in a cell, the message for the synthesis of a particular protein is present in DNA.