When a fresh water protozoan possessing a contractile vacuole, is placed in a glass containing marine water, the vacuole will
Disappear
Increase in size
Decrease in size
Increase in number
The Correct Option is A
Solution and Explanation
Top Questions on Biomolecules
Given below are two statements:
Statement I: Arginine and Tryptophan are essential amino acids.
Statement II: Glycine does not have any chiral carbon.
In the light of the above statements, which is the correct option?- JEE Main - 2026
- Chemistry
- Biomolecules
How many tripeptides are possible when following three amino acids make tripeptide? (No amino acid should repeat twice)
(A) Glycine
(B) Alanine
(C) Valine
- JEE Main - 2026
- Chemistry
- Biomolecules
- Both $\text{DNA}$ and $\text{RNA}$ are chiral molecules. The chirality in $\text{DNA}$ and $\text{RNA}$ arises due to the presence of :
- JEE Main - 2026
- Chemistry
- Biomolecules
- Given below are two statements:
Statement I: All the pairs of molecules (PbO, PbO₂); (SnO, SnO₂) and (GeO, GeO₂) contain amphoteric oxides.
Statement II: Glycine does not have any chiral carbon.
In the light of the above statements, choose the correct option.
- JEE Main - 2026
- Chemistry
- Biomolecules
- Given below are two statements:
Statement I: Arginine and Tryptophan are essential amino acids.
Statement II: Glycine does not have any chiral carbon.
In the light of the above statements, which is the correct option?
- JEE Main - 2026
- Chemistry
- Biomolecules
Questions Asked in NEET exam
- An oxygen cylinder of volume 30 litre has 18.20 moles of oxygen. After some oxygen is withdrawn from the cylinder, its gauge pressure drops to 11 atmospheric pressure at temperature \(27^\circ\)C. The mass of the oxygen withdrawn from the cylinder is nearly equal to: [Given, \(R = \frac{100}{12} \text{ J mol}^{-1} \text{K}^{-1}\), and molecular mass of \(O_2 = 32 \text{ g/mol}\), 1 atm pressure = \(1.01 \times 10^5 \text{ N/m}^2\)]
- NEET (UG) - 2025
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A constant voltage of 50 V is maintained between the points A and B of the circuit shown in the figure. The current through the branch CD of the circuit is :
- NEET (UG) - 2025
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The output (Y) of the given logic implementation is similar to the output of an/a …………. gate.
- NEET (UG) - 2025
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- A parallel plate capacitor made of circular plates is being charged such that the surface charge density on its plates is increasing at a constant rate with time. The magnetic field arising due to displacement current is:
- NEET (UG) - 2025
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What is Microalbuminuria ?
- NEET (UG) - 2025
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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.