In planarian regeneration, an anterior polarity is dependent on repression of Wnt signaling, & allows head formation.

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#Id: 8140

#Unit 2. Cellular Organization

Anterograde transport

COPII vesicles = ER to Golgi

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#Id: 5688

#Unit 7. System Physiology – Animal

Oxytocin and vasopressin are typical neural hormones, that is, hormones secreted into the circulation by nerve cells

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#Id: 7427

#Unit 5. Developmental Biology

When the ratio of PSF relative to that of bacteria exceeds a certain threshold, cells stop proliferating and initiate the expression of genes that are required for their aggregation.

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#Id: 2094

#Unit 8. Inheritance Biology

Tandem duplication- Duplicated chromosome segment is adjacent to the original segment.

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#Id: 781

#Unit 3. Fundamental Processes

Intrinsic terminators—

1. Inverted Repeat on DNA 

2. Dyad Symmetry

3. Forms GC–rich hairpin 

4. Base of hairpin 7 U residues (T residues in the DNA)