Enzyme first used for nitrogen fixation
- Nitrogenase
- Nitroreductase
- Transferase
- Transaminase
The Correct Option is A
Solution and Explanation
Top Questions on Nutrition
- Which among the following is not a characteristic feature of fatty liver?
- Which of the following is NOT a clinical manifestation of Kwashiorkor?
- Arrange the major steps involved in implementation of a public nutrition programme in correct order.
A. Determine strategies for the programme; develop the action plan and implement it
B. Prioritize the issues or nutrition health problems, to identify those that the programme will address
C. Identify the issues or health problems in the community
D. Identify risk and contributing factors and set the goals and objectives for the programme
E. Sustain the entire programme or its components; and evaluate the programme
- Match the LIST-I with LIST-II
List-I (Standardization Logo) List-II (Description/Application) A. 
I. Marked where essential vitamins and minerals have been added to the food. B. 
II. Displayed on the pack for foods that are free from harmful ingredients, food additives, or harmful processing aids. C. 
III. 100% Organic (food is free of artificial preservatives, flavors, colors, pesticides, and chemical fertilizers). D. 
IV. Marked on vegetable oil, pulses, cereals, veggies, honey, fruits, and vegetables indicating their quality. - Arrange steps involved in meal planning in the correct sequence.
A. Determining the Recommended Dietary Allowances (RDA)/Estimated Average Requirement (EAR) as given in the latest ICMR, NIN tables
B. Recording personal data
C. Selecting specific foods using the food exchanges provided in each meal
D. Distributing the food exchanges between different meals
E. Estimating the amount of different food exchanges
Questions Asked in NEET exam
- Given below are two statements:
Statement I: The DNA fragments extracted from gel electrophoresis can be used in the construction of recombinant DNA.
Statement II: Smaller size DNA fragments are observed near the anode while larger fragments are found near the wells in an agarose gel.- NEET (UG) - 2025
- Molecular Biology
Given below are two statements:
Statement I: Transfer RNAs and ribosomal RNA do not interact with mRNA.
Statement II: RNA interference (RNAi) takes place in all eukaryotic organisms as a method of cellular defence.
In the light of the above statements, choose the most appropriate answer from the options given below:- NEET (UG) - 2025
- RNA interference
- 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
- Structure of DNA and RNA
- 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
- Two gases A and B are filled at the same pressure in separate cylinders with movable pistons of radii \(r_A\) and \(r_B\) respectively. On supplying an equal amount of heat to both the cylinders, their pressures remain constant and their pistons are displaced by 16 cm and 9 cm respectively. If the change in their internal energies is the same, then the ratio \(r_A / r_B\) is:
- NEET (UG) - 2025
- Thermodynamics
Concepts Used:
Metabolism of Nitrogen
Nitrogen Cycle
The central part of nitrogen metabolism is the Nitrogen Cycle. A nitrogen molecule is made of two nitrogen atoms held together by a solid triple covalent bond (N ≡ N). There are three central pools of nitrogen – atmosphere, soil, and biomass.
Atmospheric Pool
The process of converting atmospheric nitrogen (N2) to ammonia (NH3) is called nitrogen fixation. Atmospheric nitrogen is rooted in three ways – biological, electrical, and industrial.
Soil Pool
The above processes rooted atmospheric nitrogen into the soil. This nitrogen is then taken up by plants and animals, accordingly.
Biomass Pool
When plants and animals die, the organic nitrogen within them has degraded to ammonia the process is ‘Ammonification‘ and it returns nitrogen back to the soil.