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प्रश्न
Write the characteristics of viruses.
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उत्तर
The various characteristics of viruses are:
- They are smaller and simpler than bacteria.
- They are ultramicroscopic and visible only under an electron microscope.
- They are considered to be on the boundary line of living and non-living things.
- They are obligate parasites and cannot live on their own.
- They cannot multiply on their own. They require living machinery to multiply.
- Viruses consist of genetic materials (DNA or RNA) surrounded by a protective coat of protein (capsid).
- Viruses are responsible for causing many dreadful diseases in plants, animals, and humans.
संबंधित प्रश्न
The most common carrier of communicable diseases is ___________.
Match the pairs.
| ‘A’ group | ‘B’ group | ||
| a. | Xylitol | 1. | Pigment |
| b. | Citric acid | 2. | To impart sweetness |
| c. | Lycopene | 3. | Microbial restrictor |
| d. | Nycin | 4. | Protein binding emulsifier |
| 5. | To impart acidity | ||
Observe the following figure and answer the questions :
- Identify the process shown in the figure.
- Explain the process in short.
Use the Whittaker method to classify bacteria, protozoa, fungi, algae, prokaryotic and eukaryotic microbes.
Who am I?
I have a nucleus and membrane-bound cell organelles.
Draw a neat and labelled diagram.
Bacteriophage.
Microorganisms are measured in _______.
Vaccines stimulate the body to produce ______ against the ______ in the microbes.
Name the scientist who first discovered the penicillin antibiotic. Can you name any other known antibiotic?
In what way do the four main parts of a cell work together to enable microorganisms to function as independent living units?
