Tag: bacteria - introduction, shape and structure

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

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

  1. It can carry out photosynthesis

  2. They depend on other animals for nutrition

  3. They are insectivores

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

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

Which of the following is a microscopic plant?

  1. Algae

  2. Fungi

  3. Bacteria

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

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

Viruses that infects plants generally have

  1. ds DNA

  2. ssRNA

  3. ds RNA

  4. ssDNA
Reveal answer Fill a bubble to check yourself
B Correct answer
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'.

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

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

  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
Reveal answer Fill a bubble to check yourself
A Correct answer
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. 
Multiple choice biology micro organisms non cellular organism : virus world of virus bacteria - introduction, shape and structure

The latest view for the origin of viruses is?

  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
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The current scientific consensus suggests that viruses may have originated from primitive nucleic acid and protein molecules that evolved to become self-replicating entities.

Multiple choice botany living world and classification of microbes bacteria - introduction, shape and structure bacteria: types and structure bacteria; benefits and harmful effects

Commercial lac is produced from .............

  1. The nest of a type of bird

  2. The exudation of a type of insect.

  3. The scale of a type of a fish

  4. The root of a plant
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Commercial lac is a resinous substance secreted by the lac insect (Laccifer lacca) on certain host trees. It is harvested and processed for use in varnishes and dyes.