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. 

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#Id: 187

#Unit 5. Developmental Biology

In the frog (Xenopus laevis)

A gradient of the paracrine factor activin (a morphogen), causes concentration-dependent expression differences of two genes in unspecified cells.

TLS Online TPP Program

#Id: 9227

#Unit 6. System Physiology – Plant

The specificity factor (W) estimates the preference of rubisco for CO2 versus O2

where Vc and Vo  are the maximum velocities for carboxylation and oxygenation, respectively, and Kc and Ko are the Michaelis–Menten constants for CO2 and O2, respectively

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#Id: 4037

#Unit 7. System Physiology – Animal

Acetylcholine (ACh), released from parasympathetic nerve fibers, activates muscarinic (M2) receptors in the SA node.

TLS Online TPP Program

#Id: 10048

#Unit 4. Cell Communication and Cell Signaling

ADAM 10 is a matrix metalloprotease, a member

of a class of metal-containing enzymes that cleave the

extracellular segments of target proteins.

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#Id: 8053

#Unit 1. Molecules and their Interaction Relevant to Biology

1. Alanine is can be mutated to