Atmospheric nitrogen : Uses & fixations - Science & Technology
Q. Consider the following statements
1. Atmospheric nitrogen is locked up as nitrogen gas (N2) - two atoms of nitrogen bound together so strongly that they do not react easily with other molecules.
2. The nitrogen atoms have to be separated or "fixed" so they can participate in the chemical reactions needed for life.
3. Nitrogen is essential for life that forms the building blocks of larger molecules like DNA, RNA and protein.
4. On Earth, certain organisms are capable of fixing atmospheric nitrogen and this process is critical for metabolic activity.
5. Smaller amounts of nitrogen are also fixed by energetic events like lightning strikes.
6. Nitrate (NO3) "a nitrogen atom bound to three oxygen atoms" is a source of fixed nitrogen. A nitrate molecule can join with various other atoms and molecules; this class of molecules is known as nitrates.
Which of the above statements are true?- Published on 30 Mar 15a. 1,2,3,4
b. 1,3,5
c. 1,2,3,6
d. All the above
ANSWER: All the above
