What is the first immunoglobulin heavy chain class to be expressed on the surface of a newly produced B-cell?

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#Question id: 33357

#Unit 1. Molecules and their Interaction Relevant to Biology

Protein A has a binding site for ligand X with a Kd of 10^-6 µM. Protein B has a binding site for ligand X with a Kd of 10^-9 µM. Which statement is incorrect?

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#Question id: 18899

#Unit 13. Methods in Biology

Cobalt-57 is a radioactive element  Used as a tracer to diagnose 

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#Question id: 5741

#Unit 8. Inheritance Biology

In a mammal 2 Barr bodies are observed.  How many X chromosomes does the organism have?

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#Question id: 11139

#Unit 7. System Physiology – Animal

In a simple synapse, neurotransmitter chemicals are released by ________.

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#Question id: 17198

#Unit 7. System Physiology – Animal

What is the role of endorphins?