"A balanced chemical equation never gives us a true picture of how a reaction takes place." Justify the statement by taking a suitable example.

A balanced chemical equation never gives us a true picture of how a reaction takes place. For example: The carbohydrate that we take in our food is oxidised to carbon dioxide and water. C 6 H 12 O 6 aq + 6 O 2 aq → 6 CO 2 aq + 6 H 2 O aq . The above reaction is an exothermic combination reaction. Decomposition of vegetable matter into compost is another example of this type of reaction.

What type of linkage is there in Amylopectin?

Amylopectin is insoluble in the water and constitutes about 80 - 85 % of starch. It is a branched-chain polymer of α - D - glucose unit in which the chain is formed by C 1 – C 4 glycosidic linkage whereas branching occurs at C 1 – C 6 glycosidic linkage.

What are two main functions of Nucleic Acids?

Nucleic acids are the main information-carrying molecules of the cell, and, by directing the process of protein synthesis, they determine the inherited characteristics of every living thing. The two main biological functions of nucleic acids are : (a) Replication of DNA. (b) Synthesis of protein.

What are Non-reducing sugars?

The carbohydrates that cannot reduce Fehling's solution and Tollen's reagent are known as non-reducing sugars. For example, sucrose and raffinose are non-reducing sugars. These carbohydrates can not reduce Fehling’s solution to red precipitate of Cu 2 O or Tollen’s reagent to metallic Ag .

Write four differences between DNA and RNA .

DNA RNA 1 . The sugar present in DNA is D-2-deoxyribose. 1 . The sugar present in RNA is D-ribose. 2 . DNA has double-stranded α - helix structure. 2 . RNA has single-stranded α - helix structure. 3 . DNA has a unique property of replication. 3 . RNA usually does not replicate. 4 . DNA controls the transmission of hereditary effects. 4 . RNA controls the synthesis of proteins.

What do you mean by denaturation of a protein? How does it affect properties of protein?

Denaturation involves the breaking of many of the weak linkages, or bonds (e.g., hydrogen bonds), within a protein molecule that are responsible for the highly ordered structure of the protein in its natural (native) state. Denatured proteins have a looser, more random structure; most are insoluble.

What do you mean by Peptide linkage?

A peptide linkage is a chemical bond formed between two molecules when the carboxyl group of one molecule reacts with the amino group of the other molecule, releasing a molecule of water ( H 2 O ). This is a dehydration synthesis reaction (also known as a condensation reaction), and usually occurs between amino acids.

E M B I B E

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR CHEMISTRY>Chapter -1 - Biomolecules>Haryana Board-2019>Q 11

EASY

12th Haryana Board

IMPORTANT

Earn 100

Which of the following amino acids is not optically active?

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Important Sources of Vitamins

Vitamins are essential for several biochemical reactions and the development of the body. This video describes their sources, types based on their solubility...

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