Tag: bacteria

Questions Related to bacteria

Alga Acetobularia is

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

  1. Unicellular prokaryote.

  2. Multicellular prokaryote.

  3. Unicellular eukaryote.

  4. Multicellular eukaryote.

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Correct Option: C
Explanation:

Acetabularia is a single-celled green photosynthetic algae which contain chloroplasts of the photosynthetic function. Being unicellular it has a complex shape and has been a model organism for the study of gene expression with morphogenesis. It has a large nucleus which contains a genetic material. Because of the presence of nucleus which is absent in prokaryote, these algae is classified in eukaryotes. hence algae Acetabularia is a unicellular eukaryote.

Which one of the following statements correctly disguises Nitrosamines and Nitrobacteria?

botany bacteria bacteria - introduction, shape and structure bacteria: types and structure bacteria; benefits and harmful effects

  1. Nitrosamines is nitrifying bacterium whereas Nitrobacteria is a denitrifying bacterium

  2. Nitrosamine oxidizes ammonia to nitrite while Nitrobacteria oxidizes nitrite to nitrate

  3. Nitrosamine fixes atmospheric nitrogen into ammonia while Nitrobacteria oxidizes ammonia to nitrate

  4. Nitrosamines is responsible for amino acid synthesis while Nitrobacteria is responsible for protein synthesis

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Correct Option: A

$NH _3$ in amoeba is excreted through

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

  1. Food vacuole.

  2. Contractile vacuole.

  3. Plasma membrane.

  4. Both B and C.

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Correct Option: D
Explanation:

Amoeba is a unicellular organism. The main waste material in amoeba ammonia (NH$ _3$) along with carbon dioxide (CO$ _2$). The waste material is excreted through body surface (plasmalema) by the process of diffusion. In this process, contractile vacuoles play important role.

Thus, the correct answer is option B.

Entamoeba histolytica is transmitted through

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

  1. Insect bite

  2. Bird dropping

  3. Improperly cooked pork meat

  4. Food or water contaminated with cysts

Show answer
Correct Option: D
Explanation:

Entamoeba histolytica is a protozoan protist. It is pathogenic in nature. It resides in the upper part of the human large intestine and causes the disease known as amoebic dysentery or amoebiasis. The symptoms of the disease are abdominal pain, repeated motions with blood and mucus. Entamoeba histolytica is transmitted through food or water contaminated with cysts. A mature cyst is called quadri-nucleate cyst. It has four nuclei and two chromatid bodies. Quadrinucleate cyst is the infective stage.

How many young Amoebae hatch out from a cyst of E. histolytica?

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

  1. One

  2. Two

  3. Four

  4. Six

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Correct Option: A
Explanation:

Entamoeba histolytica is a protozoan protist. It is pathogenic in nature. The type of nutrition present in Entamoeba is parasitic. The parasite is generally with one pseudopodium. The contractile vacuole is absent as there is no need of osmoregulation. It feeds on red blood corpuscles by damaging the wall of the large intestine and reaching the blood capillaries. It produces ulcers. It resides in the upper part of the human large intestine and causes the disease known as amoebic dysentery or amoebiasis. Entamoeba histolytica is transmitted through food or water contaminated with cysts. A mature cyst is called quadri-nucleate cyst. It has four nuclei and two chromatid bodies. Quadrinucleate cyst is the infective stage. Only one young Amoeba with four nuclei hatches out from a cyst of Entamoeba histolytica. However, single cyst of Entamoeba histolytica produces eight Amoebae.

Which one of the following is the basis of biological control of crown gall?

botany bacteria bacteria - introduction, shape and structure bacteria: types and structure bacteria; benefits and harmful effects

  1. Agro bacterium radiocasted strains contain a plasmid which directs the synthesis of bactenocin

  2. The Ti(tumour inducing) plasmid in Agro bacterium tumefactions is integrated with host plant DNA and is transcribed into mRNA

  3. The cloning strategy leading to a composite(chimeric) plasmid harbouring two or more genes that code for distinct bacteriocins against phytopathogenic bacteria

  4. Agrobacterium radiobacter plasmid interferes with the production of auxin by a tumefaction

Show answer
Correct Option: A

Match items in Column I with those in Column II -
 

Column I Column II
(A) Peritrichous flagellation (J) Ginkgo
(B) Living fossil  (K) Macrocystes
(C) Rhizophore (L) Escherichia coli
(D) Smallest flowering plant (M) Selaginella
(E) Largest Perennial alga (N) Wolffia

Select  the correct answer with the following

botany bacteria bacteria - introduction, shape and structure bacteria: types and structure bacteria; benefits and harmful effects

  1. A L ; B J; C M ; D N ; E K

  2. A K ; B J; C L ; D M; E N

  3. A J ; B K; C N ; D L; E K

  4. A N ; B L; C K ; D N; E J

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Correct Option: A

Which one of the following is the most important criterion used to classify living organisms into three primary kingdoms, namely-Archaea, Eubacteria and Eukarya?

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

  1. Genetic relatedness

  2. Morphological characters

  3. Physiological characters

  4. Phenotypic characters

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Correct Option: A

Rhodopseudomonas and Rhodospirillum are ______________.

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

  1. Purple non-sulphur bacteria

  2. Green non-sulphur bacteria

  3. Green sulphur bacteria

  4. Purple sulphur bacteria

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Correct Option: A

Yeast die when alcohol concentration reaches about $13$%, still yeast perform alcholic fermentation why?

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

  1. To obtain ATP

  2. Utilization of $O _{2}$

  3. For oxidation of $NADH _{2}$

  4. Obligate aerobic

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Correct Option: A