Tag: non cellular organism : virus

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

Which one of the following statements about viruses is correct?

  1. Viruses possess their own metabolic system.

  2. All viruses contain both RNA and DNA.

  3. Viruses are obligate parasites.

  4. Nucleic acid of viruses is known as capsid.
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

A virus is a small infectious agent, that replicates only inside the living cells of other organisms. Viruses can infect all types of life forms, from animals and plants to microorganisms, including bacteria and archaea. All viruses are obligate parasites; i.e., they lack metabolic machinery of their own to generate energy or to synthesize proteins, so they depend on host cells to carry out these vital functions. Thus, option C is correct.
Viruses do not possess their own metabolic system. So, depends on host machinery. Thus, option A is wrong.
All viruses contains either DNA or RNA as genetic material but, not both. Thus, option B is wrong.
The protein coat of virus is called as capsid. Thus, option D is wrong.

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

The latest view for the origin of virus is that

  1. They arose from nucleic acid and protein found in primitive water.

  2. They arose from bacteria as a result of loss of cell wall.

  3. They arose from some of the bacteria, which had developed a nucleus only.

  4. They are modified plasmids, which are fragments of the nucleic acids of the host.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Viruses play an important role in horizontal gene transfer and genetic diversity. The evolution history showcases the origin of viruses as to have evolved from plasmids when pieces of DNA moved between cells. As
big bits of cellular DNA became independent and some DNA stuck with cell genomes. Thus, the correct answer is option D.

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

A virus can be considered living being as it

  1. Reproduces inside the host

  2. Respires

  3. Can cause disease

  4. Responds to touch stimuli
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
  • A virus is an organism that can be considered both living and non-living. 
  • It can be considered as living when it is inside any host (bacterium) as the virus infects the host cell and replicates inside it making several copies of it. 
  • When it is outside the host cell, it is non- living as it can not carry out its life- processes of either reproducing or digestion etc.
  • Thus, option A is correct here.
Multiple choice biology micro organisms non cellular organism : virus world of virus bacteria - introduction, shape and structure

Viruses are non-cellular organisms but replicate themselves once they infect the host cell. To which of the following kingdom do viruses belong to?

  1. Monera

  2. Protista

  3. Fungi

  4. None of these
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Viruses are non-cellular organisms and replicate only when they infect the host cell. 

Viruses belong to none of these. Option D.

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

Viruses are living because

  1. They can reproduce.

  2. They have protein synthesising machinery.

  3. They have some genes.

  4. They are parasites.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Reproducing is one of the characteristics of the living organisms. Viruses definitely multiply. Viruses must use host cells to create more virions. Since viruses don’t have organelles, nuclei or even ribosomes, they don’t have the tools they need to copy their genes and create whole new virions. Instead, viruses enter living cells and then hijack the host’s cellular equipment to copy viral genetic information, build new capsids and assemble everything together. So, the correct answer is 'They can reproduce'.

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

All are oncogenic virus except?

  1. Influenza virus

  2. Hep. B virus

  3. HIV

  4. V. Zoster
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation
Oncogenic viruses are those that are suspected of causing cancer in human beings and some other animals. They all have DNA as their genetic material. For example, human papillomaviruses, the Epstein-Barr virus, and the hepatitis B virus, the HIV, and influenza virus. The V. Zoster virus is not an oncogenic virus.

So, the correct answer is 'V. Zoster'.
Multiple choice biology micro organisms non cellular organism : virus world of virus bacteria - introduction, shape and structure

Which of the following is the characteristic feature that distinguishes an algae from fungi?

  1. Heterotrophic

  2. Autotrophic

  3. Parasitic

  4. Sporophytic
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The algae posses the chlorophyll pigments in the cells which allow these organisms to prepare the food by the process of photosynthesis. They are autotrophic because they can prepare the food on their own. The fungi are the heterotrophic or saprophytic organisms as they do not possess the chlorophyll pigments. They cannot prepare the food and depend on the other sources for food. 

Thus, the correct answer is option B. 

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

Which of the following microorganism is autotrophic in nature?

  1. Algae

  2. Bacteria

  3. Fungi

  4. None of the above
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

An organism that is capable of synthesizing its own food from inorganic substances using light or chemical energy is called as autotrophic organism. It includes green plants, algae and certain bacteria. Algae are photoautotrophs meanings they use light as the source of energy to prepare their food.

Thus, the correct answer is option A. 

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

Algae can grow

  1. On the surface of water

  2. Inside the water

  3. On the tree

  4. None of the above
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
Both macroalgae and microalgae need sunlight, water,chlorophyll, carbon dioxide, the correct environment and nutrients to grow and make their own energy. Macroalgae have air-bladders or flexible stipes which help the algae to rise to the surface of the water and catch the sunlight.

So, the correct answer is 'A'.
Multiple choice biology micro organisms non cellular organism : virus world of virus bacteria - introduction, shape and structure

Which of the following statements is true about viruses?

  1. Viruses are filterable facultative parasites

  2. Viruses are capable of performing metabolic activities on their own

  3. All viruses known to man are facultative parasites

  4. Some viruses have cellular structure and are saprophytes
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Viruses are obligate filterable parasites capable of independent existence and when they enter inside the body of the host they start utilising the host machinery for its own reproduction. 

Thus, the correct answer is option A.