What radioactive isotope was used by Meselson and Stahl to label DNA in their experiment?
1. | 35S | 2. | 15N |
3. | 32P | 4. | None |
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Which of the following acts as the substrate and provides energy for DNA replication?
1. | Dideoxyribonucleoside triphospahtes |
2. | Ribonucleoside triphosphates |
3. | Deoxyribonucleoside triphospahtes |
4. | Deoxyribonucleotide triphosphates |
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Which of the following is not a stop codon?
1. | UAA | 2. | UGA |
3. | UAC | 4. | UAG |
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A segment of DNA coding for a polypeptide is most accurately defined as:
1. | Operon | 2. | Gene |
3. | Recon | 4. | Cistron |
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The central dogma of molecular biology was proposed by:
1. | Francis Crick | 2. | James Watson |
3. | Rosalind Franklin | 4. | Erwin Chargaff |
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The unequivocal proof that DNA is the genetic material was provided by:
1. | Avery, Macleod, and McCarty |
2. | Hershey and Chase |
3. | Meselson and Stahl |
4. | Watson and Crick |
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Hershey and Chase proved DNA as the genetic material in their experiment because :
1. | Bacteria that were infected with viruses that had radioactive proteins were not radioactive. |
2. | Bacteria that were infected with viruses that had radioactive DNA were radioactive. |
3. | Both 1 and 2 are correct. |
4. | Both 1 and 2 are incorrect. |
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DNA replication is correctly described as:
1. | Semi-conservative and Continuous |
2. | Semi-conservative and Discontinuous |
3. | Conservative and Continuous |
4. | Semi-conservative and Semi-discontinuous |
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Which of the following acts as a ribozyme for peptide bond formation in bacteria?
1. | 5s rRNA | 2. | 23s rRNA |
3. | 16s rRNA | 4. | 5.1s rRNA |
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Histones are:
1. | Positively charged and basic amino acids |
2. | Negatively charged and basic proteins |
3. | Positively charged and acidic proteins |
4. | Not found in bacteria |
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