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

A. bZIP
B. helix-turn-helix
C. TFIID
D. zinc finger

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

A. 60°C
B. 70 °C
C. 90 °C
D. 100 °C

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3. Who’s X-ray work aided Watson and Crick in their discovery of the double helix?

A. W.H. Bragg
B. R. Franklin
C. L. Pauling
D. Leaderberg

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4. DNA replication in eukaryotes occurs only in

A. G1 phase
B. S phase
C. G2 phase
D. M phase

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5. Which polymerase is active in DNA repairing

A. Polymerase I
B. Polymerase II
C. Polymerase III
D. none of these

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