lacZ encodes for b-galactosidase,a tetramer of 500 kD. The enzyme breaks lactose is cleaved into glucose and galactose.  This enzyme also produces an important byproduct, b-1,6-allolactase.

TLS Online TPP Program

#Id: 5270

#Unit 7. System Physiology – Animal

The inherent leakiness of the sinus nodal fibers to sodium and calcium ions causes their self-excitation.

TLS Online TPP Program

#Id: 7576

#Unit 5. Developmental Biology

Sperm that are not capacitated are “held up” in the cumulus matrix and are unable to reach the egg

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#Id: 1926

#Unit 4. Cell Communication and Cell Signaling

Classical Pathway

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#Id: 7407

#Unit 5. Developmental Biology

The segment polarity genes encode proteins that are constituents of the Wnt and Hedgehog signaling pathways.

TLS Online TPP Program

#Id: 1407

#Unit 4. Cell Communication and Cell Signaling

In the absence of ATP, the myosin head is firmly attached to the actin filament.