If a micrometer does not have a ratchet stop or a friction thimble, which of the following should be followed?

Three different culture media are shown below. Medium A Medium B Medium C Na2HPO4 Tide detergent Glucose KH2PO4 Na2HPO4 Peptone MgSO4 KH2PO4 (NH4)2SO4 CaCl2 MgSO4 KH2PO2 NaHCO3 (NH4)2SO4 Na2HPO4 For the three types of media in the above table, which medium (or media) is/are chemically defined?  

Receptor editing:

Which of the following catalyzes the release of CLIP from MHC II?

Which chemokine/s direct/s a B cell out of the blood stream and into a secondary lymphoid tissue toward the T cell area?

From what you learned about SCID in class, which of the following statements does not directly correlate to the type of SCID we discussed?

Both α:β and γ:δ TCR’s are restricted to recognize antigens only when the antigen is bound by and presented by either MHC class I or MHC class II molecules.

Which chemokine/s direct/s a B cell out of the blood stream and into a secondary lymphoid tissue toward the T cell area?

Unproductive rearrangement of the BCR genes on both chromosomes leads to:

MHC restriction: