Molecular Basis of Inheritance MCQ Questions & Answers in Botany

111. One gene-one enzyme relationship was established for the first time in

A Salmonella typhimurium

B Escherichia coli

C Diplocococcus pneumoniae

D Neurospora crassa

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112. An environmental agent, which triggers transcription from an operon, is a

A regulator

B inducer

C depressor

D controlling element

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113. Telomerase is an enzyme which is a

A simple protein

B RNA

C ribonucleoprotein

D repetitive DNA

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114. Nucleosome core is made of

A $${H_1},{H_2}A,{H_2}B$$ and $${H_3 }$$

B $${H_1},{H_2}A,{H_2}B,{H_4}$$

C $${H_1},{H_2}A,{H_2}B,{H_3}$$ and $${H_4 }$$

D $${H_2}A,{H_2}B,{H_3}$$ and $${H_4 }$$

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115. Read the following four statements (A-D).
(A) In transcription, adenosine pairs with uracil.
(B) Regulation of lac operon by repressor is referred to as positive regulation.
(C) The human genome has approximately 50,000 genes.
(D) Haemophilia is a sex-linked recessive disease.
How many of the above statements are correct?

A Two

B Three

C Four

D One

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116. In an inducible operon, the genes are

A Always expressed

B Usually not expressed unless a signal turns them "on"

C Usually expressed unless a signal turns them "off"

D Never expressed

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117. Out of 64 codons, 61 codons code for 20 types of amino acid. It is called

A degeneracy of genetic code

B overlapping of gene

C wobbling of codon

D universility of codons

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118. One gene -one enzyme hypothesis was postulated by

A Hershey and Chase

B A. Garrod

C Beadle and Tatum

D R. Franklin

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119. In a DNA percentage of thymine is 20% then what will be the percentage of guanine?

A 20%

B 40%

C 30%

D 60%

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120. In Escherichia coli, lac operon is induced by

A lactose

B promoter gene

C β-galactosidase

D I-gene

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111. One gene-one enzyme relationship was established for the first time in

112. An environmental agent, which triggers transcription from an operon, is a

113. Telomerase is an enzyme which is a

114. Nucleosome core is made of

116. In an inducible operon, the genes are

117. Out of 64 codons, 61 codons code for 20 types of amino acid. It is called

118. One gene -one enzyme hypothesis was postulated by

119. In a DNA percentage of thymine is 20% then what will be the percentage of guanine?

120. In Escherichia coli, lac operon is induced by

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