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Biological Classification · Question 79

AIPMT 2008MCQMedium📈 Topic in 25% papers+4−1
1

In the light of recent classification of living organisms into three domains of life (bacteria, archaea and eukarya), which one of the following statements is true about archaea?

  1. Archaea completely differ from both prokaryotes and eukaryotes.
  2. Archaea completely differ from prokaryotes.
  3. Archaea resemble eukarya in all respects.
  4. Archaea have some novel features that are absent in other prokaryotes and eukaryotes.

Answer

(4) Archaea have some novel features that are absent in other prokaryotes and eukaryotes.

Solution

Archaea are prokaryotic in cell organisation (no nucleus, no membrane-bound organelles), but share some molecular features with eukarya (e.g., histone-like proteins, similar RNA polymerase).

⇒ As per NCERT, archaebacteria differ from other bacteria in having a different cell wall structure, a feature responsible for their survival in extreme conditions.

∵ They also have unique features such as ether-linked membrane lipids and cell walls without peptidoglycan, found neither in other prokaryotes nor in eukaryotes,

∴ archaea have some novel features absent in other prokaryotes and eukaryotes; they do not differ completely from either group.

Answer: (4)

AIPMT 2008

Keep practising — Biological Classification

2

Cellulose is the major component of cell walls of

  1. Pseudomonas
  2. Saccharomyces
  3. Pythium
  4. Xanthomonas
AIPMT 2008
3

Which one of the following is a slime mould?

  1. Physarum
  2. Thiobacillus
  3. Anabaena
  4. Rhizopus
AIPMT 2007
4

Which one of the following statements about Mycoplasma is wrong?

  1. They are pleomorphic.
  2. They are sensitive to penicillin.
  3. They cause diseases in plants.
  4. They are also called PPLO.
AIPMT 2007
5

Which pair of the following belongs to basidiomycetes?

  1. Puffballs and Claviceps
  2. Peziza and stinkhorns
  3. Morchella and mushrooms
  4. Bird's nest fungi and puffballs
AIPMT 2007
6

Which of the following environmental conditions are essential for optimum growth of Mucor on a piece of bread? Choose the answer from the following options.

  1. B, C and F only
  2. A, C and E only
  3. A, D and E only
  4. B, D and E only
AIPMT 2006
7

What is common about Trypanosoma, Noctiluca, Monocystis and Giardia?

  1. These are all parasites
  2. These are all unicellular protists
  3. They have flagella
  4. They produce spores
AIPMT 2006
8

The causative agent of mad-cow disease is a-

  1. Virus
  2. Bacterium
  3. Prion
  4. Worm
AIPMT 2006
9

The bacterium ( Clostridium botulinum) that causes botulism is-

  1. A facultative aerobe
  2. An obligate aerobe
  3. A facultative anaerobe
  4. An obligate anaerobe
AIPMT 2006
10

Barophilic prokaryotes

  1. grow and multiply in very deep marine sediments
  2. occur in water containing high concentrations of barium hydroxide
  3. readily grow and divide in sea water enriched in any soluble salt of barium
  4. grow slowly in highly alkaline frozen lakes at high altitudes.
AIPMT 2005
11

There exists a close association between the alga and the fungus within a lichen. The fungus

  1. provides protection, anchorage and absorption for the alga
  2. provides food for the alga
  3. fixes the atmospheric nitrogen for the alga
  4. releases oxygen for the alga
AIPMT 2005

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All NEET Botany chapters
Class 11The Living WorldBiological ClassificationPlant KingdomMorphology of Flowering PlantsAnatomy of Flowering PlantsCell: The Unit of LifeCell Cycle and Cell DivisionTransport in PlantsMineral NutritionPhotosynthesis in Higher PlantsRespiration in PlantsPlant Growth and Development
Class 12Reproduction in OrganismsSexual Reproduction in Flowering PlantsPrinciples of Inheritance and VariationMolecular Basis of InheritanceStrategies for Enhancement in Food ProductionMicrobes in Human WelfareOrganisms and PopulationsEcosystemBiodiversity and ConservationEnvironmental Issues
Other chaptersBiomolecules (Biology)