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Earn 100

Select the incorrect statement regarding the salient features of the double-helix structure of DNA
(a)It is made of two polynucleotide chains
(b)The two chains have anti-parallel polarity
(c)Guanine is bonded with thymine by three -bonds
(d)The two chains are coiled in a right-handed fashion

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Important Questions on Molecular Basis of Inheritance
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A hypothetical sequence of a transcription unit is represented below
Template strand
Coding strand
If we switch the position of the promoter with a terminator in the above-given transcription unit and transcription occurs, then the sequence of RNA transcribed will be

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Match the following columns and select the correct option
column I (Genes of lac operon) |
column II (Function) |
a. Operator gene | (i) Interacts with repressor protein |
b. Promoter gene | (ii) Transcribes mRNA for polypeptide synthesis |
c. Structural gene | (iii) Provides attachment site for RNA polymerase |
d. Regulator gene | (iv) Controls the activity of operator gene |
