B cell properties

1.    They are APCs

2.    They can express MHC2

3.    Have surface marker  CD19

4.    Antibodies at surface of b cell – IgM, IgD

5.    Part of Adaptive immunity

6.    B cell convert into plasma cell

TLS Online TPP Program

#Id: 421

#Unit 2. Cellular Organization

The nucleosome is 200 bp of DNA, organized by an octamer of small, basic histone proteins into a beadlike structure. 

TLS Online TPP Program

#Id: 6299

#Unit 3. Fundamental Processes

In the case of the bacterial enzyme bearing s70, this transition, often called isomerization, does not require energy derived from ATP hydrolysis and is instead the result of a spontaneous conformational change in the DNA– enzyme complex to a more energetically favorable form.

TLS Online TPP Program

#Id: 7228

#Unit 5. Developmental Biology

Superantigens

Viral or bacterial proteins that bind simultaneously to the Vβ domain of a T-cell receptor and to the α chain of a Class II MHC molecule

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#Id: 4846

#Unit 1. Molecules and their Interaction Relevant to Biology

TLS Online TPP Program

#Id: 7286

#Unit 6. System Physiology – Plant

That time, there was no selective pressure for rubisco to discriminate between CO2 and O2. 

The Km for CO2 is about 9 microM, and that for O2 is about 350 microM. The modern atmosphere contains about 20% O2 and only 0.04% CO2, so an aqueous solution in equilibrium with air at room temperature contains about 250 microM O2 and 11 microM CO2—concentrations that allow significant O2 “fixation” by rubisco and thus a significant waste of energy.