★ Biochemistry Quiz
How many different amino acids do organisms use to build proteins?
A. 10
B. 12
C. 20
D. 22
Select your answer:

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Immunology › ViewWhat type of immunoglobulin gene rearrangement occurs during B cell progenitor development?
A. DH-JH rearrangement
B. DL-JL rearrangement
C. both heavy and light chain rearrangement
D. VH-DJH rearrangement
E. VL-DJL rearrangement
Central and Peripheral Nervous System › View
This system detects stimuli with receptors.
A. Somatic
B. Autonomic
C. Peripheral
D. Sympathetic