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Biological Classification · Question 69

AIPMT 2010 (Mains)MCQEasy📈 Topic in 25% papers+4−1
1

Given below is the diagram of a bacteriophage. In which one of the options all the four parts A, B, C and D are correct? [Figure]

  1. A Collar, B Tail fibres, C Head, D Sheath
  2. A Tail fibres, B Head, C Sheath, D Collar
  3. A Head, B Sheath, C Collar, D Tail fibres
  4. A Sheath, B Collar, C Head, D Tail fibres

Answer

(3) A Head, B Sheath, C Collar, D Tail fibres

Solution

A bacteriophage (e.g., T4) consists of a polyhedral head containing DNA, a short collar (neck), a contractile tail sheath around a hollow core, a base plate and long tail fibres.

In the figure: A the polyhedral head; B the striated (contractile) sheath; C the collar between head and sheath; D the long jointed tail fibres.

As per NCERT (Fig. 2.6 c), the bacteriophage shows head, sheath and tail fibres.

∴ A Head, B Sheath, C Collar, D Tail fibres.

Answer: (3)

AIPMT 2010 (Mains)

Keep practising — Biological Classification

2

Virus envelope is known as

  1. capsid
  2. virion
  3. nucleoprotein
  4. core
AIPMT 2010 (Prelims)
3

Single-celled eukaryotes are included in

  1. protista
  2. fungi
  3. archaea
  4. monera
AIPMT 2010 (Prelims)
4

Some hyperthermophilic organisms that grow in highly acidic (pH 2) habitats belong to the two groups

  1. eubacteria and archaea
  2. cyanobacteria and diatoms
  3. protists and mosses
  4. liverworts and yeasts
AIPMT 2010 (Prelims)
5

Infectious proteins are present in –

  1. Viroids
  2. Geminiviruses
  3. Satellite viruses
  4. Prions
AIPMT 2010 (Prelims)
6

T.O. Diener discovered a

  1. free infectious DNA
  2. infectious protein
  3. bacteriophage
  4. free infectious RNA
AIPMT 2009
7

Oxygenic photosynthesis occurs in

  1. Oscillatoria
  2. Rhodospirillum
  3. Chlorobium
  4. Chromatium
AIPMT 2009
8

Which one is the wrong pairing for the disease and its causal organism?

  1. Black rust of wheat – Puccinia graminis
  2. Loose smut of wheat – Ustilago nuda
  3. Root knot of vegetables – Meloidogyne sp.
  4. Late blight of potato – Alternaria solani
AIPMT 2009
9

Bacterial leaf blight of rice is caused by a species of

  1. Alternaria
  2. Erwinia
  3. Xanthomonas
  4. Pseudomonas
AIPMT 2008
10

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
AIPMT 2008
11

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

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