In the absence of Hg2+, MerR functions as a repressor and binds to the operator region of the mer operon, thus preventing transcription of the structural genes.

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#Id: 4912

#Unit 13. Methods in Biology

Standard Deviation - The spread of statistical data is measured by the standard deviation.

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#Id: 2147

#Unit 9. Diversity of Life Forms

Homoplasy complicates building the phylogeny for a group of species.

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#Id: 6515

#Unit 7. System Physiology – Animal

Norepinephrine is the only small-molecule transmitter that is synthesized in synaptic vesicles

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#Id: 2921

#Unit 13. Methods in Biology

RCF units are therefore dimensionless (denoting multiples of g) and revolutions per
minute are usually abbreviated as r.p.m.

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#Id: 10358

#Unit 4. Cell Communication and Cell Signaling

T-dependent response

Recognition of protein antigens and requires the participation of CD4 helper T cells