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#Id: 3995


When an ethidium ion intercalates between two base pairs, it causes the DNA to unwind by 260, reducing the normal rotation per base pair from 360 to 100. In other words, ethidium decreases the twist of DNA.

#Unit 2. Cellular Organization #Structure of chromatin and chromosomes #Part B Pointers
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TLS Online TPP Program

#Id: 788

#Unit 3. Fundamental Processes

Transcription initiation and termination, both require breaking of hydrogen bonds.

TLS Online TPP Program

#Id: 4325

#Unit 11. Evolution and Behavior

If a life force besides the airborne microorganisms were responsible for microbial growth within the sterilized flasks, it would have access to the broth, whereas the microorganisms would not.

TLS Online TPP Program

#Id: 4324

#Unit 11. Evolution and Behavior

His design allowed air inside the flasks to be exchanged with air from the outside, but prevented the introduction of any airborne microorganisms, which would get caught in the twists and bends of the flasks’ necks.

TLS Online TPP Program

#Id: 4496

#Unit 13. Methods in Biology

In recording limb lead I, the negative terminal of the electrocardiograph is connected to the right arm and the positive terminal is connected to the left arm

TLS Online TPP Program

#Id: 4326

#Unit 11. Evolution and Behavior

He correctly predicted that sterilized broth in his swan-neck flasks would remain sterile as long as the swan necks remained intact.

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