A common feature of all active auxins is a molecular distance of about 0.5 nm between a fractional positive charge on the aromatic ring and a negatively charged carboxyl group.

TLS Online TPP Program

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#Unit 2. Cellular Organization

Linking number is topological property which is expressed as  Total No. of Base Pair/Base pair per turn.

TLS Online TPP Program

#Id: 371

#Unit 2. Cellular Organization

How to calculate linking number?

TLS Online TPP Program

#Id: 372

#Unit 2. Cellular Organization

If Lk <Lk0 and DLk is <0 means negative, then the DNA is said to be “negatively supercoiled.”

TLS Online TPP Program

#Id: 373

#Unit 2. Cellular Organization

Conversely, if Lk >Lk0  and DLk >0 means positive, then the DNA is “positively supercoiled.”

TLS Online TPP Program

#Id: 374

#Unit 2. Cellular Organization

Superhelical Density 

TLS Online TPP Program

#Id: 375

#Unit 2. Cellular Organization

Circular DNA molecules purified from both bacteria and eukaryotes are usually negatively supercoiled, having values of s of approximately –0.06.