In a strand of nucleic acid, two nucleotides are linked together by:
1. 3’ – 5’ phosphodiester bond
2. 5’ – 3’ phosphodiester bond
3. 2’ – 5’ phosphodiester bond
4. 3’ – 1’ phosphodiester bond

Subtopic:  The DNA |
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The daughter DNA that was extracted from the culture one generation after the transfer from 15N to 14N medium had:

1. Low density
2. Intermediate density
3. High density
4. One had low and another had high density

Subtopic:  DNA Replication |
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A failure in cell division after DNA replication results in:

1. Point mutation 2. Aneuploidy
3. Polyploidy 4. Apoptosis

Subtopic:  DNA Replication |
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What is another name for thymine?

1.5 – bromouracil2.3 – bromouracil
3.3 – methyl uracil4.5 – methyl uracil

Subtopic:  The DNA |
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In Griffith's experiment, which of the following bacterial strains was capable of causing pneumonia in mice?

1. Live R
2. Bacteria strain with polysaccharide coat
3. Heat Killed S
4. Live R with capsule and Heat Killed S

Subtopic:  Search for Genetic Material |
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What facilitates the opening of the helix during the elongation step of transcription?

1. RNA polymerase 2. Helicase
3. Topoisomerase 4. Gyrase
Subtopic:  Transcription: I |
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The repressor of the lac operon is:

1. Lactose itself 2. A steroid
3. Synthesized constitutively 4. A product of structural gene
Subtopic:  Gene Regulation: Lac Operon |
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The base pairing in a double stranded DNA is correctly described as:

1. Similar 2. Identical
3. Complementary 4. Synergistic

Subtopic:  DNA Double Helix |
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Any mistakes during DNA replication by the enzyme would result into:

1. Cancer 2. Apoptosis
3. Cell fragmentation 4. Mutation

Subtopic:  DNA Replication |
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In a transcription unit, RNA polymerase binds to:

1. Ori 2. Promoter
3. Operator 4. Structural gene

Subtopic:  Transcription: I |
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