DNA STRUCTURE AND REPLICATION QUIZ

What is the range of melting point temperatures (Tm) for most DNA molecules?

60 to 80°C

50 to 60°C

80 to l00°C

70 to 90°C

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Reverse transcriptase produces

DNA from peptides

DNA from RNA

RNA from RNA

RNA from DNA

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When DNA polymerase is in contact with guanine in the parental strand, what does it add to the growing daughter strand?

Phosphate

Uracil

Cytosine

Guanine

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Which of the following enzyme adds complementary bases during replication?

Helicase

Replicase

Synthesase

Polymerase

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DNA with a G-C content of 50% will melt at approximately

70 °C

60°C

100 °C

90 °C

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If one cell has AT contents 40%, what will be the percentage of Guanine residue?

15%

Guanine residue can not be calculated

30%

60%

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Which of the following is not a structural motif in DNA binding proteins?

zinc finger

TFIID

bZIP

helix-turn-helix

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A cesium chloride will separate DNA molecules by

absorption

density

resorption

adhesion

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The chromosomal DNA complexes with

five types of histone as H1, H2A, H2B, H3 and H4

two types of histone as H1 and H4

three types of histone as H1, H2A and H4

four types of histone as H1, H2A, H3 and H4

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In a typical electrophoresis experiment, larger fragments of DNA move more

slowly, so they appear nearer the top of a gel photograph

slowly, so they appear nearer the bottom of a gel photograph

quickly, so they appear nearer the top of a gel photograph

quickly, so they appear nearer the bottom of a gel photograph

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