Binding of the repressor to the operator sequence blocks binding of RNA polymerase and so inhibits transcription.

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#Id: 2976

#Unit 3. Fundamental Processes

The MCM proteins continue to function at the two bidirectional replication forks as the replication helicase.

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#Id: 9300

#Unit 4. Cell Communication and Cell Signaling

Rhodopsin has two components: 

Opsin protein, member of the GPCR A family 

11-cis-retinal light-absorbing pigment

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#Id: 8273

#Unit 1. Molecules and their Interaction Relevant to Biology

Hydrogen bonds are generally stronger than ordinary dipole-dipole and dispersion forces, but weaker than true covalent and ionic bonds.

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#Id: 5622

#Unit 7. System Physiology – Animal

Activation of Aδ fibers, which release glutamate, is responsible for first pain (also called fast pain or epicritic pain)

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#Id: 5300

#Unit 7. System Physiology – Animal

The total duration of the cardiac cycle, including systole and diastole, is the reciprocal of the heart rate.