When equal amounts of extrorotatory and levorotatory isomers are present, the resulting mixture becomes optically inactive because the optical activities of each isomer cancel each other.

Such a mixture is called a racemic or dl-mixture or (±)-conglomerate and this process of converting an optically active compound into the racemic modification is known of racemization. 

TLS Online TPP Program

#Id: 7678

#Unit 1. Molecules and their Interaction Relevant to Biology

Counter-clockwise rotation starting at 0º gives negative dihedral angles from -1º through

90º ending at -180º (the same dihedral angle  as +180º).

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#Id: 3048

#Unit 10. Ecological Principles

Succession is affected by the distance that dispersing organisms have to travel from undisturbed mainland areas.

TLS Online TPP Program

#Id: 5697

#Unit 7. System Physiology – Animal

Central diabetes insipidus – Failure to Produce ADH Nephrogenic diabetes insipidus - Inability of the Kidneys to Respond to ADH

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#Id: 1234

#Unit 7. System Physiology – Animal

In bone, 

1,25-dihydroxycholecalciferol acts synergistically with PTH to stimulate osteoclast activity and bone resorption.

TLS Online TPP Program

#Id: 2325

#Unit 3. Fundamental Processes

SR proteins are involved in exon definition in which they interact with U1 and U2AF forming commitment E complex.