Nuclear envelope

Double-membrane structure; the outer membrane is continuous with the endoplasmic reticulum and the two membranes are perforated by nuclear pore complexes

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#Id: 7173

#Unit 5. Developmental Biology

Twin and Siamois encode homeodomain transcription factors and are expressed in the organizer

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#Id: 5641

#Unit 7. System Physiology – Animal

Rhodopsin is comprised of: 

Retinal (an aldehyde of vitamin A)

Opsin protein (GPCR)

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#Id: 1725

#Unit 4. Cell Communication and Cell Signaling

Soluble CD23 binds to CD21 on the surface of IgE synthesizing B cells, IgE synthesis is increased.

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#Id: 8971

#Unit 11. Evolution and Behavior

The Death of a Gene

When a gene is duplicated, the new copy is often dead-on arrival (lacks the regulatory elements). 

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#Id: 2067

#Unit 8. Inheritance Biology

COMPONENTS OF PHENOTYPIC VARIANCE

1. Genetic variance (Vg)

2. Environmental variance (Ve)

3. Genetic–environmental interaction variance (VGE)