The diameter of a typical α helix is about 12 Å, which matches the 12 Å wide and 6–8 Å deep major groove of B-form DNA. 

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#Id: 7928

#Unit 2. Cellular Organization

Muscle cells have an abundant, modified smooth ER called the sarcoplasmic reticulum.

The release and reuptake of Ca2+ by the sarcoplasmic reticulum trigger myofibril contraction and relaxation, respectively

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#Id: 3738

#Unit 10. Ecological Principles

Community Similarity

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#Id: 9681

#Unit 4. Cell Communication and Cell Signaling

PI-3 kinase signaling pathway is terminated by

PTEN phosphatase, which hydrolyzes the 3-phosphate

in PI 3-phosphates.

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#Id: 9295

#Unit 6. System Physiology – Plant

The nitrate reductase dimer- Three binding domains

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#Id: 3400

#Unit 3. Fundamental Processes

Cleavage of both LexA and UmuD is stimulated by a protein called RecA, which is activated by single-stranded DNA resulting from DNA damage.