The termination sequences are unidirectional; that is, they function in only one orientation. The ter site is recognized by a unidirectional contrahelicase

TLS Online TPP Program

#Id: 7456

#Unit 5. Developmental Biology

Phosphorylation of RegA is mediated by sensor histidine kinases/phosphatases which either phosphorylate or dephosphorylate themselves on a histidine residue when a signal molecule binds to their sensor domain.

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#Id: 1309

#Unit 2. Cellular Organization

E1’s ion-binding sites are exposed to the cytoplasm, and it has high affinity for Na+ but low affinity for K+

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#Id: 5858

#Unit 10. Ecological Principles

The number of species should increase with increasing island size. This is also known as the species-area hypothesis.

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#Id: 6929

#Unit 8. Inheritance Biology

Deletions can be detected cytologically by studying the banding patterns in stained chromosomes. 

TLS Online TPP Program

#Id: 1243

#Unit 7. System Physiology – Animal

FSH & LH control growth of the ovaries and testes.