Histidine has pKa values of 1.8, 6.0 (R-group) and 9.3 . At pH 8.0, the net charge on histidine is

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#Question id: 28357

#Unit 5. Developmental Biology

 what is the function of the gene tudor (tud) & oskar (osk) and if it is mutated that leads to____

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#Question id: 6945

#Unit 5. Developmental Biology

The portion of the Drosophila body plan which will produce the wing is called

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#Question id: 843

#Unit 1. Molecules and their Interaction Relevant to Biology

_______ enzymes that catalyze isomerization reactions in folding pathways of some proteins.

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#Question id: 32429

#Unit 2. Cellular Organization

In skeletal muscle the cytoplasmic Ca2+ concentration is restored to resting levels within 30 milliseconds, allowing the:

a. Binding of tropomyosin with myosin

b. Binding of calcium with troponin C 

c. Myofibrils to relax

d. Myofibrils to contract

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#Question id: 12416

#Unit 10. Ecological Principles

A type I survivorship curve describes a population that has relatively