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

DNA of E.coli  

  1. ds circular

  2. ss circular

  3. ds linear

  4. ss linear
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

  E. coli , a gram negative rod shaped bacteria has since the time of discovery have been commonly used for biological lab experiment and research. The simple cell structured E. coli has one circular chromosome and a ds circular DNA molecule with 4.6 million base pairs in length and 4288 protein coding genes.

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

Muramic acid is present in cell walls of

  1. Bacteria

  2. Green algae

  3. Yeast

  4. All fungi
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The cell walls of bacteria are composed of a macromolecule peptidoglycan which is a repeating framework of long glycan chains having alternate N-acetyl glucosamine and N-acetyl muramic acid; these glycan chains are cross-linked by short peptide fragments to provide a strong but flexible support framework. This makes option A correct. The green algal cell wall is composed mainly of cellulose which makes option B incorrect. Chitin is common constituent of cell walls of all type of fungi; option C is incorrect. The yeast cell wall itself is mainly composed of glucans ($\beta$$-glucans), mannoproteins and chitin; option D is incorrect. Thus, the correct answer is option A.

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

What are the major groups of microorganisms?

  1. Bacteria, fungi

  2. Protozoa, algae

  3. Bacteria, fungi, protozoa, algae and virus.

  4. Fungi, algae and virus
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Microorganisms are the organisms that we cannot see by our naked eyes. It can be prokaryotic unicellular like bacteria, eukaryotic unicellular like protozoa, eukaryotic multicellular like fungi and algae and even acellular like viruses.

Thus, the correct answer is option C.

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

Unicellular organisms are capable of (i) Independent existence (ii) Performing the essential functions of life

  1. Only I

  2. Only II

  3. Both A and B

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

Unicellular organisms are made up of a single cell and perform all the life processes for survival and independent existence.  Hence, the cell is called as the fundamental structural and functional unit of life.

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

Many bacteria bear minute hairy structures on their cell wall which are involved in genetic transfer are called as

  1. Hairs

  2. Flagella

  3. Pili

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

Pili are minute hair like appendages, that emerges from suface of Gram -ve bacteria. They have similar structure as flagella and often involved in attachment to surface and making of biofilm. They also help in DNA exchange. They are involved in conjugation which results in transfer or exchange of genetic material. 

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

Escherichia colt has the following combination of characters.

  1. Rod shaped, 1-3$\mu $m long, gram negative
  2. Rod shaped, 1- 3$\mu $m long, gram positive
  3. Spiral, 1-3$\mu $m long, gram negative
  4. Spiral, 1-3$\mu $m long, gram positive
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Escherichia coli is a rod-shaped, gram-negative bacterium that is typically 1-3 micrometers in length.

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

Binary fission in Amoeba involves ____________.

  1. Amitosis

  2. Mitosis

  3. Meiosis

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

The reproduction in amoeba is asexual, called binary fission, where it replicated its cells by mitosis and its cell divide in two equal daughter cells. Amitosis is similar to binary fission. Meiosis does not take place in amoeba.

The correct answer is B. 

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

Torula condition' occurs in ________.

  1. Rhizopus

  2. Ulothrix

  3. Spirogyra

  4. Riccia
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
When some species of like mucor they grow in high concentrated liquid medium of sugar and they brown up into small pieces called odia and further they grow like yeast by budding and this condition called Torula condition.
Hence the correct answer is A. 
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

Amoeba takes food through ____________.

  1. Phagocytosis

  2. Pinocytosis

  3. Endocytosis

  4. All the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Amoeba takes its food by the method of phagocytosis (i.e ingesting or engulfing the food particles), also by means of pinocytosis (wherein amoeba wraps around its membranes around the food forms vesicles and pinch it inside the membrane and then gradually digests it) and by endocytosis (in which the outermost the membrane of amoeba either stretches inwards or projects outwards to obtain nutrition.

The correct answer is D.