Molecular Basis of Inheritance MCQ Questions & Answers in Botany

131. If the distance between two consecutive base pairs is $$0.34\,nm$$ and the total number of base pairs of a DNA double helix in a typical mammalian cell is $$6.6 \times {10^9}\,bp,$$ then the length of the DNA is approximately

A 2.5 meters

B 2.2 meters

C 2.7 meters

D 2.0 meters

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132. Which step of translation does not consume a high energy phosphate bond ?

A Translocation

B Amino acid activation

C Peptidyl-transferase reaction

D Aminoacyl tRNA binding to active ribosomal site

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133. Which one of the following does not follow the central dogma of molecular biology?

A Pea

B Mucor

C Chlamydomonas

D HIV

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134. Mutation generally produces

A polygenes

B dominant genes

C recessive genes

D lethal genes

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135. The wild type E. coli cells are growing in normal medium with glucose. They are transferred to a medium containing only lactose as sugar. Which of the following changes takes place?

A The lac operon is repressed

B All operons are induced

C The lac operon is induced

D E.coli cells stop dividing

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136. The two polynucleotide chains in DNA are

A discontinuous

B antiparallel

C semi-conservative

D parallel

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137. What does "lac" refer to in what we call the lac operon?

A The number 1,00,000

B Lactose

C Lactase

D Lac insect

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138. Gene and cistron words are sometimes used synonymously because

A one cistron contains many genes

B one gene contains many cistrons

C one gene contains one cistron

D one gene contains no cistron

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139. In sea urchin DNA, which is double stranded, 17% of the bases were shown to be cytosine. The percentages of the other three bases expected to be present in this DNA are:

A $$G$$ 17%, $$A$$ 16.5%, $$T$$ 32.5%

B $$G$$ 17%, $$A$$ 33%, $$T$$ 33%

C $$G$$ 8.5%, $$A$$ 50%, $$T$$ 24.5%

D $$G$$ 34%, $$A$$ 24.5%, $$T$$ 24.5%

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140. Which one of the following pairs of nitrogenous bases of nucleic acids, is wrongly matched with the category mentioned against it?

A Thymine, Uracil - Pyrimidines

B Uracil, Cytosine - Pyrimidines

C Guanine, Adenine - Purines

D Adenine, Thymine - Purines

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131. If the distance between two consecutive base pairs is $$0.34\,nm$$ and the total number of base pairs of a DNA double helix in a typical mammalian cell is $$6.6 \times {10^9}\,bp,$$ then the length of the DNA is approximately

132. Which step of translation does not consume a high energy phosphate bond ?

133. Which one of the following does not follow the central dogma of molecular biology?

134. Mutation generally produces

135. The wild type E. coli cells are growing in normal medium with glucose. They are transferred to a medium containing only lactose as sugar. Which of the following changes takes place?

136. The two polynucleotide chains in DNA are

137. What does "lac" refer to in what we call the lac operon?

138. Gene and cistron words are sometimes used synonymously because

139. In sea urchin DNA, which is double stranded, 17% of the bases were shown to be cytosine. The percentages of the other three bases expected to be present in this DNA are:

140. Which one of the following pairs of nitrogenous bases of nucleic acids, is wrongly matched with the category mentioned against it?

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