Subject

Biology

Class

NEET Class 12

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 Multiple Choice QuestionsMultiple Choice Questions

61.

Streptomycin is obtained from

  • Streptomyces griseus

  • S. aureofaciens

  • S. venezuelae

  • S. ramosus


62.

DNA element with ability to change position is called

  • cistron

  • transposon

  • intron

  • recon


63.

Initiation codon is

  • UUU

  • UGA

  • AUG

  • UAG


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64.

DNA mutiplication is called

  • translation

  • replication

  • transduction

  • transcription


B.

replication

DNA multiplication takes place by replication at S- phase of interphase during cell cycle. It is semi- conservative in nature.

Transcription is the mode by which DNA passes its genetic information to mRNA. It is the first step in protein synthesis which takes place in nucleus of eukaryotic cells.

Translation is the synthesis of a chain of polypeptide by mRNA. It takes place at the site of ribosomes and involves three steps- Initiation, Elonagtion and Termination.

Transduction is the transfer of genes from one bacterial cell to another by means of a virus.


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65.

Which is always present in photochemical smog?

  • O3

  • CO2

  • SO2

  • CH4


66.

The soil which is transported by wind is known as

  • colluvial

  • eolian

  • aluvial

  • glacial soil


67.

Lichen is the pioneer vegetation on which succession?

  • Hydrosere

  • Lithosere

  • Psammosere

  • Xerosere


68.

In Pinus, male cone bears a large number of

  • ligules

  • anthers

  • micro- sporophylls

  • mega- sporophylls


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69.

Decomposers are

  • autotrophs

  • autoheterotrophs

  • organotrophs

  • heterotrophs


70.

Cleavage polyembryony occurs in

  • Pinus

  • Mini Cycas

  • Cycas

  • Ephedra


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