Sickle cell anaemia is due to
- Change of Amino Acid in α-chain of Haemoglobin
- Change of Amino Acid in β-chain of Haemoglobin
- Change of Amino acid in both α and β chain of Haemoglobin
- Change of Amino acid either α or β chain of Haemoglobin
The Correct Option is B
Solution and Explanation
Top NEET Biology Questions
Given below are two statements:
Statement I: The primary source of energy in an ecosystem is solar energy.
Statement II: The rate of production of organic matter during photosynthesis in an ecosystem is called net primary productivity (NPP).
In light of the above statements, choose the most appropriate answer from the options given below:- NEET (UG) - 2025
- Biology
- Ecosystems
- Name the class of enzyme that usually catalyzes the following reaction: \[ S - G + S^{\prime} \rightarrow S + S^{\prime} - G \] Where \( G \) represents a group other than hydrogen, \( S \) is a substrate, and \( S^{\prime} \) is another substrate.
- Given below are two statements: Statement I: In the RNA world, RNA is considered the first genetic material evolved to carry out essential life processes. RNA acts as a genetic material and also as a catalyst for some important biochemical reactions in living systems. Being reactive, RNA is unstable.
Statement II: DNA evolved from RNA and is a more stable genetic material. Its double helical strands being complementary, resist changes by evolving repair mechanisms. In the light of the above statements, choose the most appropriate answer from the options given below:- NEET (UG) - 2025
- Biology
- Structure of DNA and RNA
- Match List - I with List II
List I List II A. The Evil Quartet III. Causes of biodiversity losses B. Ex situ conservation I. Cryopreservation C. Lantana camara II. Alien species invasion D. Dodo IV. Extinction - Which of the following enzyme(s) are NOT essential for gene cloning?
A. Restriction enzymes
B. DNA ligase
C. DNA mutase
D. DNA recombinase
E. DNA polymerase- NEET (UG) - 2025
- Biology
- Molecular Biology
Top NEET Principles of Inheritance and Variation Questions
Which of the following statements are correct about Klinefelter’s Syndrome?
A. This disorder was first described by Langdon Down (1866).
B. Such an individual has overall masculine development. However, the feminine development is also expressed.
C. The affected individual is short statured.
D. Physical, psychomotor and metal development is retarded. E. Such individuals are sterile.Choose the correct answer from the options given below:
- NEET (UG) - 2023
- Biology
- Principles of Inheritance and Variation
- Which one of the following symbols represents mating between relatives in human pedigree analysis?
- NEET (UG) - 2023
- Biology
- Principles of Inheritance and Variation
- The phenomenon of pleiotropism refers to
- NEET (UG) - 2023
- Biology
- Principles of Inheritance and Variation
- Given below are two statements:
Statement I: Mendel studied seven pairs of contrasting traits in pea plants and proposed the Laws of Inheritance
Statement II: Seven characters examined by Mendel in his experiment on pea plants were seed shape and colour, flower colour, pod shape and colour, flower position and stem height.
In the light of the above statements, choose the correct answer from the options given below:- NEET (UG) - 2022
- Biology
- Principles of Inheritance and Variation
- Which of the following occurs due to the presence of an autosome linked dominant trait?
- NEET (UG) - 2022
- Biology
- Principles of Inheritance and Variation
Top NEET Questions
Given below are two statements:
Statement I: The primary source of energy in an ecosystem is solar energy.
Statement II: The rate of production of organic matter during photosynthesis in an ecosystem is called net primary productivity (NPP).
In light of the above statements, choose the most appropriate answer from the options given below:- NEET (UG) - 2025
- Ecosystems
- Given below are two statements:
Statement I: A hypothetical diatomic molecule with bond order zero is quite stable.
Statement II: As bond order increases, the bond length increases.
In the light of the above statements, choose the most appropriate answer from the options given below:- NEET (UG) - 2025
- Chemical bonding and molecular structure
- Name the class of enzyme that usually catalyzes the following reaction: \[ S - G + S^{\prime} \rightarrow S + S^{\prime} - G \] Where \( G \) represents a group other than hydrogen, \( S \) is a substrate, and \( S^{\prime} \) is another substrate.
Identify the correct orders against the property mentioned:
A. H$_2$O $>$ NH$_3$ $>$ CHCl$_3$ - dipole moment
B. XeF$_4$ $>$ XeO$_3$ $>$ XeF$_2$ - number of lone pairs on central atom
C. O–H $>$ C–H $>$ N–O - bond length
D. N$_2$>O$_2$>H$_2$ - bond enthalpy
Choose the correct answer from the options given below:- NEET (UG) - 2025
- Chemical bonding and molecular structure
- A microscope has an objective of focal length \(f_o = 2\) cm and an eyepiece of focal length \(f_e = 4\) cm. The tube length of the microscope is \(L = 40\) cm. If the distance of distinct vision of eye is \(D = 25\) cm, the magnification in the microscope is:
- NEET (UG) - 2025
- Optical Instruments
Concepts Used:
Types of Cells
Cells are the basic building blocks of all living organisms. They can be classified into two main types: prokaryotic and eukaryotic.
- Prokaryotic cells: These are simple, single-celled organisms that lack a true nucleus and other membrane-bound organelles. They have a simple cell wall and are usually smaller in size than eukaryotic cells. Examples of prokaryotic cells include bacteria and archaea.
- Eukaryotic cells: These are complex, multicellular organisms that have a true nucleus and various membrane-bound organelles. They are typically larger in size than prokaryotic cells and can be found in plants, animals, fungi, and protists. Eukaryotic cells can be further classified into different types based on their structure and function, including:
- Animal cells: These are eukaryotic cells found in animals and humans. They lack a cell wall and have a flexible cell membrane that allows them to change shape. Animal cells contain various organelles, including mitochondria, ribosomes, and a nucleus.
- Plant cells: These are eukaryotic cells found in plants. They have a rigid cell wall made of cellulose and contain chloroplasts for photosynthesis. Plant cells also contain various organelles, including mitochondria, ribosomes, and a nucleus.
- Fungal cells: These are eukaryotic cells found in fungi. They have a cell wall made of chitin and contain various organelles, including mitochondria, ribosomes, and a nucleus.
- Protist cells: These are eukaryotic cells found in protists, which are a diverse group of unicellular and multicellular organisms. Protist cells can vary in size and shape and can contain various organelles, depending on their specific function.
Understanding the different types of cells is important for understanding their structure, function, and role in various biological processes.