Rate-limiting step in synthesis of catecholamines:  Tyrosine is converted to dihydroxy-phenylalanine (DOPA) by tyrosine hydroxylase

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#Id: 4702

#Unit 11. Evolution and Behavior

Females are more related to their sisters (0.75) than they would be to their own offspring (0.50).

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#Id: 5892

#Unit 3. Fundamental Processes

DNA polymerases fall into five families based on sequence homologies; the palm is well conserved among them, but the thumb and fingers provide analogous secondary structure elements from different sequences.

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#Id: 678

#Unit 3. Fundamental Processes

The RNA component is typically short 159 bases long in Tetrahymena, and 451 bases long in humans, though 1.3 kb in yeast

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#Id: 5735

#Unit 10. Ecological Principles

Communities in Climatically Similar Habitats May Themselves Be Similar in Species Richness

A stable community changes little in species richness over time

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#Id: 6277

#Unit 8. Inheritance Biology

Polymeric Gene interaction (9:6:1) The combination of two dominant alleles that intensifies the phenotype or creates a median variation. 

Long                                          circular

                        A                                                                     

                                                                                           Disc shape

                       

Long                                                    circular

                         B