PYQSide ExamsMy practice

Biological Classification · Question 78

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

Thermococcus, Methanococcus and Methanobacterium exemplify

  1. bacteria whose DNA is relaxed or positively supercoiled but which have a cytoskeleton as well as mitochondria
  2. bacteria that contain a cytoskeleton and ribosomes
  3. archaebacteria that contain protein homologous to eukaryotic core histones
  4. archaebacteria that lack any histones resembling those found in eukaryotes but whose DNA is negatively supercoiled

Answer

(3) archaebacteria that contain protein homologous to eukaryotic core histones

Solution

As per NCERT, archaebacteria (methanogens, halophiles, thermoacidophiles) live in extreme habitats and differ from other bacteria in having a different cell wall structure.

⇒ Methanococcus and Methanobacterium are methanogens and Thermococcus is a hyperthermophile, so all three are archaebacteria.

∵ Their DNA is packed by histone-like proteins (archaeal histones) that are homologous to the eukaryotic core histones H3 and H4,

∴ they are archaebacteria containing proteins homologous to eukaryotic core histones.

⇒ Prokaryotes have no mitochondria or true cytoskeleton, so options (1) and (2) are wrong.

Answer: (3)

AIPMT 2008

Keep practising — Biological Classification

2

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.
AIPMT 2008
3

Cellulose is the major component of cell walls of

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

Which one of the following is a slime mould?

  1. Physarum
  2. Thiobacillus
  3. Anabaena
  4. Rhizopus
AIPMT 2007
5

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
6

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
7

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
8

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
9

The causative agent of mad-cow disease is a-

  1. Virus
  2. Bacterium
  3. Prion
  4. Worm
AIPMT 2006
10

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
11

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

All Biological Classification PYQs →

PDFDownload Biological Classification PYQs as PDF Free, with answer key and a QR code to every solution — print it or study offline⬇
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)