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Biological Classification · Question 17

NEET (UG) 2019MCQEasy📈 Topic in 25% papers+4−1
1

Which of the following statements is incorrect?

  1. Infective constituent in viruses is the protein coat
  2. Prions consist of abnormally folded proteins
  3. Viroids lack a protein coat
  4. Viruses are obligate parasites

Answer

(1) Infective constituent in viruses is the protein coat

Solution

As per NCERT, a virus is a nucleoprotein; its genetic material (RNA or DNA) is infectious, while the protein coat (capsid) only protects the nucleic acid.

∴ Statement (1) is incorrect.

Prions are infectious agents made of abnormally folded proteins (2 correct); viroids are free RNA without a protein coat (3 correct); viruses multiply only inside living host cells, i.e., they are obligate parasites (4 correct).

Answer: (1)

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2

Which of the following statement is incorrect?

  1. Conidia are produced exogenously and ascospores endogenously.
  2. Yeasts have filamentous bodies with long thread-like hyphae.
  3. Morels and truffles are edible delicacies.
  4. Claviceps is a source of many alkaloids and LSD.
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3

Match Column-I with Column –II. Choose the correct answer from the options given below :

  1. (a)-(i), (b)-(ii), (c)-(iii), (d)-(iv)
  2. (a)-(iii), (b)-(ii), (c)-(i), (d)-(iv)
  3. (a)-(ii), (b)-(i), (c)-(iii), (d)-(iv)
  4. (a)-(ii), (b)-(iii), (c)-(iv), (d)-(i)
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4

Which among the following is not a prokaryote?

  1. Mycobacterium
  2. Saccharomyces
  3. Oscillatoria
  4. Nostoc
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5

Select the wrong statement.

  1. Mushrooms belong to basidiomycetes.
  2. Cell wall is present in members of fungi and plantae.
  3. Pseudopodia are locomotory and feeding structures in sporozoans.
  4. Mitochondria are the powerhouse of the cell in all kingdoms except monera.
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6

After karyogamy followed by meiosis, spores are produced exogenously in

  1. Saccharomyces
  2. Neurospora
  3. Alternaria
  4. Agaricus
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7

Which of the following organisms are known as chief producers in the oceans?

  1. Euglenoids
  2. Cyanobacteria
  3. Dinoflagellates
  4. Diatoms
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8

Ciliates differ from all other protozoans in

  1. having a contractile vacuole for removing excess water
  2. having two types of nuclei
  3. using flagella for locomotion
  4. using pseudopodia for capturing prey
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9

Which of the following are found in extreme saline conditions?

  1. Eubacteria
  2. Cyanobacteria
  3. Mycobacteria
  4. Archaebacteria
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10

Viroids differ from viruses in having

  1. DNA molecules without protein coat
  2. RNA molecules with protein coat
  3. RNA molecules without protein coat
  4. DNA molecules with protein coat
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11

Which among the following are the smallest living cells, known without a definite cell wall, pathogenic to plants as well as animals and can survive without oxygen?

  1. Pseudomonas
  2. Mycoplasma
  3. Nostoc
  4. Bacillus
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