Eukaryotic cells also have type I and type II topoisomerases. The type I enzymes are topoisomerases I and III;

The eukaryotic type II topoisomerases cannot underwind DNA (introduce negative supercoils), but they can relax both positive and negative supercoils.

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#Id: 3517

#Unit 2. Cellular Organization

A gene family is defined as a group of genes that encode related or identical products as a result of gene-duplication events.

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#Id: 4789

#Unit 5. Developmental Biology

In embryos whose mothers have mutant glp-1, ABp is transformed into an ABa cell

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#Id: 6802

#Unit 3. Fundamental Processes

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#Id: 5803

#Unit 7. System Physiology – Animal

Hyperthyroidism Thyrotoxicosis

Graves’ Disease Toxic Goiter

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#Id: 9269

#Unit 6. System Physiology – Plant

Fe protein 

contains 2 identical subunits (dimer) – nif H

Each subunit has MW of 30 ~ 72 kD.

Each subunit contains an Fe-S cluster (4Fe and 4S2-).