Subject

Biology

Class

NEET Class 12

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 Multiple Choice QuestionsMultiple Choice Questions

61.

During transcription holoenzyme RNA polymerase binds to a DNA sequence and the DNA assumes a saddle like structure at that point. What is that sequence called?

  • CAAT box

  • GGTT box

  • AAAT box

  • TATA box


62.

Three crops that contribute maximum to global food grain production are

  • wheat, rice and maize

  • wheat, maize and sorghum

  • rice, maize and sorghum

  • wheat, rice and barley


63.

Genes for cytoplasmic male sterility in plants are generally located in

  • mitochondrial genome

  • cytosol

  • chloroplast genome

  • nuclear genome


64.

Which one of the following hydrolysis internal phosphodiester bonds in a polynucleotide chain?

  • Lipase

  • Exonuclease

  • Endonuclease

  • Protease


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65.

The name of Norman Borlaug is associated with

  • green revolution

  • yellow revolution

  • white revolution

  • blue revolution


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66.

E. coli cells with a mutated Z gene of the lac operon cannot grow in medium containing only lactose as the source of energy because

  • in the presence of glucose, E. coli cells do not utilize lactose

  • they cannot transport lactose from the medium into the cell

  • the lac operon is constitutevely active in these cells

  • they cannot synthesize functional β- galactosidase


D.

they cannot synthesize functional β- galactosidase

Lac operon is a cluster of genes encoding three proteins that bacteria use to obtain energy from the sugar lactose. There are three structural genes in lac operon.

(i) Lac Z (3063bp)- This genes codes for enzyme β- galactosidase. It breaks lactose into glucose and galactose. Therefore, E. coili cells with a mutated Z genes cannot grow in medium containing only lactose as the source of energy because they cannot synthesize functional β- galactosidase.

(ii) Lac Y (800 bp)- This gene codes for enzyme β galactose permease. It is a membrane bound protein and helps in the transport of metabolites.

(iii) Lac A (800bp)- This gene codes for enzyme β- galactose transacetylase. It transfers an acetyl group from acetyl Co- A to β- galactosidase.


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67.

More than 70% of world's freshwater is contained in

  • Antartica

  • Glaciers and Mountains

  • Greenland

  • Polar ice


68.

Which one of the following pairs is mismatched?

  • Biomass burning - Release of CO2

  • Fossil fuel burning - Release of CO2

  • Nuclear power - Radioactive wastes

  • Solar energy - Green house effect


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69.

Biodiversity act of India was passed by the Parliament in the year

  • 1996

  • 1992

  • 2002

  • 2000


70.

Identify the correctly matched pair

  • Montreal protocol - Global warming

  • Kyoto protocol - Climatic change

  • Ramsar convention - Ground water pollution

  • Basal convention - Biodiversity conservation


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