B-cell survival in the follicle is dependent on access to the TNF-family member cytokine B-cell activation factor (BAFF), otherwise known as B lymphocyte survival factor (BLyS), which is secreted by the FDCs.

TLS Online TPP Program

#Id: 8131

#Section 2: General Biology

In most mammalian tissues, ubiquinone (also called coenzyme Q) has 10 isoprene units.

Dolichols of animals have 17 to 21 isoprene units (85 to 105 carbon atoms), bacterial dolichols have 11, and those of plants and fungi have 14 to 24.

TLS Online TPP Program

#Id: 7753

#Section 2: General Biology

Electron affinity: The enthalpy change that results from adding an electron to a gaseous atom.

Electron affinity is becoming less negative (less exothermic) and less likely to gain an electron. 

TLS Online TPP Program

#Id: 8326

#Section 3: Genetics, Cellular and Molecular Biology

The two ends of microfilament polymerize at different rates:

fast-growing end - plus end

slow-growing end - minus end

TLS Online TPP Program

#Id: 7743

#Section 2: General Biology

A covalent radius is one-half the distance between the nuclei of two identical atoms.

TLS Online TPP Program

#Id: 8405

#Section 3: Genetics, Cellular and Molecular Biology

Muscle contraction depends on two processes that consume enormous amounts of ATP: 

1. Filament sliding, driven by the ATPase of the myosin

2. Ca2+ pumping, driven by the Ca2+ ATPase