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प्रश्न
How do vaccines work?
उत्तर
Vaccines contain dead or weakened microbial strains of a particular disease. When a vaccine is introduced into a healthy body. It produces specific cells against the pathogen.
These cells, are called antibodies and they becomes active when the pathogen attack our body. The body fights and kills them by producing specific set of reactions.
These antibodies remain in the body for life long and protect against the microbe when microbe enters the body again.
Vaccines can be given either orally (in the forms of drops) or injected in the body.
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संबंधित प्रश्न
Give the schematic representation of the TCA cycle.
Draw diagram of Nitrogen cycle.
Match the following.
| Microorganism | Role Played |
| Nitrosomonas | Nitrogen fixation |
| Azotobacter | Ammonification |
| Pseudomonas species | Nitrification |
| Putrefying bacteria | Denitrification |
Which free living microorganism helps in nitrogen fixation?
The nitrogen molecules present in the air can be converted into nitrates and nitrites by
Free-living soil bacteria such as Pseudomonas sp. are responsible for the ______ process in the nitrogen cycle.
In the Nitrification process, the ammonium compounds are oxidised to soluble ______.
Nitrogen is an essential component of protein, DNA, and chlorophyll.
Consider the following statements. Which of the statements given below is incorect?
Match column I with Column II.
| Column I | Column II |
| A Acidic | (i) Phenylalanine (Phe) |
| B Neutral | (ii) Cysteine (Cys) |
| C Aromatic | (iii) Valine (Val) |
| D S(Sulphur) containing | (iv) Asparagine (Asn) |
Select the correct answer from the options given below.
