Molecular Basis of Inheritance — Practice Quiz
Maharashtra Board · Class 12 · Biology
Try a 4-question quiz on Molecular Basis of Inheritance for Maharashtra Board Class 12 Biology: tap an answer to check it and see why.
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Quick Quiz: Molecular Basis of Inheritance
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Who first isolated nucleic acid from white blood cell nuclei in 1869?
In Griffith's transformation experiment, which bacterial strain was virulent and pathogenic?
How many base pairs of DNA does one nucleosome approximately contain?
Which type of DNA replication was experimentally proved by Meselson and Stahl?
Sample Questions
Which enzymes are involved in DNA packaging in prokaryotes? (Select all correct answers)
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DNA gyrase, DNA topoisomerase I
DNA gyrase and DNA topoisomerase I are involved in maintaining the supercoiled state of DNA during packaging in prokaryotes. DNA ligase joins DNA fragments, RNA polymerase synthesizes RNA, and DNA helicase unwinds DNA.
Which functions of DNA are correctly described? (Select all correct answers)
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Heterocatalytic - synthesis of RNA and proteins, Autocatalytic - synthesis of DNA itself
Heterocatalytic function involves DNA directing synthesis of molecules other than itself (RNA, proteins). Autocatalytic function involves DNA directing its own synthesis (replication).
What is the universal initiation codon for protein synthesis?
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AUG
AUG is the universal initiation codon that codes for methionine and starts protein synthesis in all organisms. UAA, UAG, and UGA are stop codons that terminate protein synthesis.
In the lac operon, what happens when lactose is present?
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Inducer inactivates repressor
When lactose is present, it acts as an inducer that binds to the repressor protein, inactivating it. This allows the operon to be switched on and enzymes for lactose metabolism to be produced.
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