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If Meselson and Stahl's experiment is continued for four generations in bacteria, the ratio of N15/N15: N15/N14: N14/N14 containing DNA in the fourth generation would be

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Important Questions on Molecular Basis of Inheritance

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12th CBSE
IMPORTANT
NCERT Exemplar Biology - Class 12>Chapter 6 - Molecular Basis of Inheritance>MULTIPLE-CHOICE QUESTIONS>Q 23
If the sequence of nitrogen bases of the coding strand of DNA in a transcription unit is 5' - ATGAATG - 3', the sequence of bases in its RNA transcript would be
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12th CBSE
IMPORTANT
NCERT Exemplar Biology - Class 12>Chapter 6 - Molecular Basis of Inheritance>MULTIPLE-CHOICE QUESTIONS>Q 24
The RNA polymerase holoenzyme transcribes
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12th CBSE
IMPORTANT
NCERT Exemplar Biology - Class 12>Chapter 6 - Molecular Basis of Inheritance>MULTIPLE-CHOICE QUESTIONS>Q 25
If the base sequence of a codon in mRNA is 5'-AUG-3', the sequence of tRNA pairing with it must be
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12th CBSE
IMPORTANT
NCERT Exemplar Biology - Class 12>Chapter 6 - Molecular Basis of Inheritance>MULTIPLE-CHOICE QUESTIONS>Q 26
The amino acid attaches to the tRNA at its
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12th CBSE
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NCERT Exemplar Biology - Class 12>Chapter 6 - Molecular Basis of Inheritance>MULTIPLE-CHOICE QUESTIONS>Q 27
To initiate translation, the mRNA first binds to
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12th CBSE
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NCERT Exemplar Biology - Class 12>Chapter 6 - Molecular Basis of Inheritance>MULTIPLE-CHOICE QUESTIONS>Q 28
In E.coli, the lac operon gets switched on when
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12th CBSE
IMPORTANT
NCERT Exemplar Biology - Class 12>Chapter 6 - Molecular Basis of Inheritance>VERY SHORT ANSWER TYPE QUESTIONS>Q 1
What is the function of histones in DNA packaging?
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12th CBSE
IMPORTANT
NCERT Exemplar Biology - Class 12>Chapter 6 - Molecular Basis of Inheritance>VERY SHORT ANSWER TYPE QUESTIONS>Q 2
Distinguish between heterochromatin and euchromatin. Which of the two is transcriptionally active?