Cellulose does not form blue colour with iodine because
Cellulose does not form blue colour with iodine because
It is a helical molecule
It does not contain complex helices and hence cannot hold iodine molecules
It breaks down when iodine reacts with it
It is a disaccharide
The Correct Option is B
Solution and Explanation
Cellulose is a linear polymer of glucose molecules, and it does not form the complex helical structure that starch does. The blue color with iodine is a result of the iodine molecules getting trapped within the helical structure of starch, creating a specific complex. Cellulose lacks this helical arrangement, so it does not produce the blue color with iodine.
Therefore, The correct option is (B): It does not contain complex helices and hence cannot hold iodine molecules.
Top Questions on Biomolecules
- Identify correct conversion during acidic hydrolysis from the following: (A) Starch gives galactose.
(B) Cane sugar gives equal amount of glucose and fructose.
(C) Milk sugar gives glucose and galactose.
(D) Amylopectin gives glucose and fructose.
(E) Amylose gives only glucose.
Choose the correct answer from the options given below:- JEE Main - 2025
- Chemistry
- Biomolecules
- Why can't vitamin C be stored in our body?
- CBSE CLASS XII - 2025
- Chemistry
- Biomolecules
- Amino acids show amphoteric behaviour, why?
- CBSE CLASS XII - 2025
- Chemistry
- Biomolecules
- Write the product obtained when D-glucose reacts with \( H_2N - OH \).
- CBSE CLASS XII - 2025
- Chemistry
- Biomolecules
- Nucleotides are joined together by
- CBSE CLASS XII - 2025
- Chemistry
- Biomolecules
Questions Asked in NEET exam
- Arrange the following elements in increasing order of electronegativity:
N, O, F, C, Si
Choose the correct answer from the options given below:- NEET (UG) - 2024
- Modern Periodic Law And The Present Form Of The Periodic Table
- In an ideal transformer, the turns ratio is \(N_p/N_s\) =1/2 .The ratio \(V_S:V_P\) is equal to (the symbols carry their usual meaning):
- NEET (UG) - 2024
- Transformers
- What is the fate of a piece of DNA carrying only gene of interest which is transfered in to an alien organism?
A. The piece of DNA would be able to multiply itself independently in the progeny cells of the organism.
B. It may get integrated into the genome of the recipient.
C. It may multiple and be inherited along with the host DNA.
D. The alien piece of DNA is not an integral part of chromasame.
E. It shows ability to replicate.
Choose the correct answer from the options given below: - If \(x=5\sin(\pi i+\frac{\pi}{3})m\) represents the motion of a particle executing simple harmonic motion, the amplitude and time period of motion, respectively, are :
- NEET (UG) - 2024
- simple harmonic motion
- \(^{290}_{82}X\stackrel{\alpha}{\rightarrow}Y\stackrel{e^+}{\rightarrow}Z\stackrel{\beta^-}{\rightarrow}P\stackrel{e^-}{\rightarrow}Q\)
In the nuclear emission stated above, the mass number and atomic number of the product Q respectively, are :- NEET (UG) - 2024
- Nuclear physics
Concepts Used:
Biomolecules
Biomolecules are the most essential organic molecules, which are involved in the maintenance and metabolic processes of living organisms. These non-living molecules are the actual foot-soldiers of the battle of sustenance of life.
There are four major classes of Biomolecules – Carbohydrates, Proteins, Nucleic acids and Lipids.
- Carbohydrates are chemically defined as polyhydroxy aldehydes or ketones or compounds which produce them on hydrolysis.
- Proteins are another class of indispensable biomolecules, which make up around 50per cent of the cellular dry weight. Proteins are polymers of amino acids arranged in the form of polypeptide chains. The structure of proteins is classified as primary, secondary, tertiary and quaternary in some cases.
- Nucleic acids refer to the genetic material found in the cell that carries all the hereditary information from parents to progeny. There are two types of nucleic acids namely, deoxyribonucleic acid (DNA) and ribonucleic acid (RNA). The main function of nucleic acid is the transfer of genetic information and synthesis of proteins by processes known as translation and transcription.
- Lipids are organic substances that are insoluble in water, soluble in organic solvents, are related to fatty acids and are utilized by the living cell.