Tag: micro organisms

Questions Related to micro organisms

Which of the following is the reason behind the autotrophic nature of algae?

biology micro organisms non cellular organism : virus world of virus bacteria - introduction, shape and structure

  1. It can carry out photosynthesis

  2. They depend on other animals for nutrition

  3. They are insectivores

  4. None of these

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Correct Option: A
Explanation:

The answer is option A "It can carry out photosynthesis"
Because organisms that carry out photosynthesis to make their own food are called autotrophic. Algae contain chlorophyll pigments which helps them to trap energy from sunlight to form glucose (food) on their own.
While option B represents a feature of heterotrophs and option C for carnivores that eat insects.

Which of the following is a microscopic plant?

biology micro organisms non cellular organism : virus world of virus bacteria - introduction, shape and structure

  1. Algae

  2. Fungi

  3. Bacteria

  4. None of the above

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Correct Option: A
Explanation:

Algae are single-celled, aquatic, microscopic plants. As they can make their own food, they are considered as plants. They contain photosynthetic pigment, chlorophyll-like plants. However, they do not have root, leaves and stems, unlike plants.

Thus, the correct answer is 'Algae'.

The agents which are known to cause Creutzfeldt-Jakob disease (CJD) are 

biology micro organisms non cellular organism : virus world of virus bacteria - introduction, shape and structure

  1. Protein particles

  2. A class of bacteria

  3. A class of viruses

  4. Fungi

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Correct Option: A
Explanation:

Creutzfeldt-Jakob disease (CJD) is caused by infectious protein particle called prions.

Which gives the green colour appearance to the pond?

biology micro organisms non cellular organism : virus world of virus bacteria - introduction, shape and structure

  1. Algae

  2. Grass

  3. Fertilizer

  4. None of the above

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Correct Option: A
Explanation:
Planktonic Algae bloom can appear as a paint-like scum on top of the water's surface. The water column turns green throughout and is often described as "pea soup."

So, the correct answer is 'Algae'.

Viruses that infects plants generally have

biology micro organisms non cellular organism : virus world of virus bacteria - introduction, shape and structure

  1. ds DNA

  2. ssRNA

  3. ds RNA

  4. ssDNA

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Correct Option: B
Explanation:

  • Approximately around 70% of viruses infecting plant are ssRNA, 20% are ssDNA and rest are either dsRNA or dsDNA.
  • ssDNA is advantageous due to it's ability to infect and duplicate it's genome faster.

So, the correct option is 'ssRNA'.

Cryptogram of a virus (Gibbs and Harrison 1968) has $4$ pairs of symbols to be used in virus classification. The pair $1$ indicates

biology micro organisms non cellular organism : virus world of virus bacteria - introduction, shape and structure

  1. Type of nucleic acid in virus/ structure of nucleic acid

  2. Molecular weight of nucleic acid/ percentage of nucleic acid

  3. Shape of virus particle/ shape of capsid

  4. Kind of host infected/ kind of vector

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Correct Option: A
Explanation:
Cryptogram code is proposed by Gibbs and Harrison (1968) to describe the virus. The code consists of 4 pairs of symbols. 
The first pair indicates- The type of nucleic acid/number of strands in the particular nucleic acids. For example cryptogram of Poliovirus is written as R/l: 2.5/30: S/S: V/O.
So, the correct answer is option A, Type of nucleic acid in virus/ structure of nucleic acid. 

The latest view for the origin of viruses is?

biology micro organisms non cellular organism : virus world of virus bacteria - introduction, shape and structure

  1. They have arisen from nucleic acid and proteins found in primitive soup

  2. They arose from bacteria as a result of the loss of the cell, ribosome etc

  3. They arose from some bacteria, which has developed a nucleus only

  4. They are modified plasmids, which are in-fact the fragments of the nucleic acids of host

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Correct Option: A

Restriction endonuclease enzyme obtained from?

biology micro organisms non cellular organism : virus world of virus bacteria - introduction, shape and structure

  1. Virus

  2. Bacteria

  3. Plant

  4. Fungi

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Correct Option: A