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


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62.

DNA element with ability to change position is called

  • cistron

  • transposon

  • intron

  • recon


B.

transposon

Transposon is a DNA segment or genetic element moving from one chromosome to another. It was introduced by R W Hedges and A E Jacob in 1974.

Cistron is the functional unit of DNA molecules as it codes for a particular gene product.

Recon is the cross- over unit or it is segment of DNA which participates in crossing over.

Introns are the interrupted genes which do not form the part of mRNA and are further removed from primary mRNA during gene expression in eukaryotes.


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63.

Initiation codon is

  • UUU

  • UGA

  • AUG

  • UAG


64.

DNA mutiplication is called

  • translation

  • replication

  • transduction

  • transcription


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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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