Tag: non cellular organism : virus

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Multiple choice botany the world of microbes bacteria - introduction, shape and structure bacteria: types and structure bacteria; benefits and harmful effects non cellular organism : virus world of virus

Which of the following microtubule arrangement is absent in the kinetosome of eukaryotic flagella?

  1. 9+0

  2. 9+2

  3. Both of the above

  4. None of the above
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
  • Eukaryotic cilia and flagella have similar organization-
  • They possess a central bundle of microtubules called the axoneme which contain nine outer doublet microtubules surrounded by a central pair of singlet microtubules.
  • This characteristic 9 + 2 arrangement of microtubules is seen when the axoneme of eukaryotic flagella.
  • The correct answer is OPTION B.
Multiple choice botany the world of microbes bacteria - introduction, shape and structure bacteria: types and structure bacteria; benefits and harmful effects non cellular organism : virus world of virus

The bacterial cell wall is made up of 

  1. Cellulose

  2. Hemicellulose

  3. Cellulose and hemicellulose

  4. Peptidoglycan

  5. Glycogen
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Peptidoglycans (or mucopeptide or glycopeptide or murein) are the structural elements of almost all bacterial cell walls. They constitute as much as 95% of the cell wall in some Gram positive bacteria to as little as 5 to 10% in Gram negative bacteria. Peptidoglycans are made up of a polysaccharide backbone consisting of alternating muramic acid and glucose amine residues in equal amounts.

Multiple choice botany bacteria bacteria - introduction, shape and structure bacteria: types and structure bacteria; benefits and harmful effects non cellular organism : virus world of virus

Bacteroides are?

  1. Enlarged non-motile cellular bacteria Rhizobium leguminosarum in root nodules of legumes

  2. A bacterial cell infected with viruses

  3. A motile bacterium

  4. Nitrosomonas bacteria in soil
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Bacteroids are the differentiated, non-motile form of Rhizobium bacteria found within the root nodules of legumes, where they fix nitrogen.

Multiple choice botany the world of microbes bacteria - introduction, shape and structure bacteria: types and structure bacteria; benefits and harmful effects non cellular organism : virus world of virus

Membrane bound organelles are absent in 

  1. Plasmodium

  2. Saccharomyces

  3. Streptococcus

  4. Chlamydomonas
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Membrane bound organelles are absent in prokaryotes. As compared to a eukaryotic cell, the only comparable organelles present in prokaryotes are ribosomes which are naked nucleoprotein particles. Plasmodium is a unicellular eukaryotic organism which belongs to Kingdom Protista. Saccharomyces is also a unicellular eukaryotic organism which belongs to Kingdom Mycota or Fungi. Streptococcus is a unicellular prokaryotic organism which belongs to Kingdom Monera. Chlamydomonas is a unicellular eukaryotic organism, previously classified under Kingdom Plantae as Chlorophyceae but has now been moved to Kingdom Protista. Of the given options only Streptococcus is a prokaryotic organism. Hence, membrane bound cell organelles are missing in Streptococcus.

Multiple choice botany bacteria bacteria - introduction, shape and structure bacteria: types and structure bacteria; benefits and harmful effects non cellular organism : virus world of virus

Which of the following is common features of Amoeba?

  1. Pseudopodia, food vacuole, phagocytosis, assimilation and egestion

  2. Phagocytosis, contractile vacuole, lysosome, holozoic and ingestion

  3. Contractile vacuole, absorption of food, egestion and grinding of food particles

  4. Pseudopodia, ciliary movement, contractile vacuole and phagocytosis
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

An Amoeba is a type of organism belongs to kingdom Protista. They have the ability to alter its shape, primarily by extending and retracting pseudopods. Amoeba has contractile vacuole which expels excess water from the cell. The various processes which are involved in the nutrition of Amoeba are:
Ingestion, digestion, absorption, assimilation and egestion. Amoeba has not excretory organs. The undigested food collects inside the Amoeba is thrown out of the body by the cell membrane. Thus, the correct answer is option A.