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DNA Structure and Replication

DNA Structure and Replication
Overwinding or overtightening of DNA during replication is caused and removed by

Single stranded protein, DNAa
DNAb, DNA polymerase
DNAa, gyrase
DNAb, gyrase

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

70 to 90°C
50 to 60°C
60 to 80°C
80 to l00°C

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DNA Structure and Replication
30 nm wide helix with five or six nucleosomes per helix is known as

solenoid
kinoplast
halonoid
none of these

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DNA Structure and Replication
The size of a linear DNA fragment in a gel can be estimated by

the sedimentation coefficient
comparison with a molecular weight standard such as Hind III digested phage lambda
fluorescence in UV light
the time it takes the gel to run

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

60°C
90 °C
100 °C
70 °C

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DNA Structure and Replication
The overall conclusion of the Hershey-Chase experiment was that

DNA was responsible for heredity
proteins and DNA were responsible for heredity
phage DNA was similar to bacterial DNA
the ratio of Adenine to thymine was always the same

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