The insulin receptor, a receptor tyrosine kinase, activates several signal transduction pathways, including the one leading to the activation of protein kinase B

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#Id: 959

#Unit 5. Developmental Biology

Slow block to polyspermy (cortical granule reaction) becomes active about a minute after the first successful sperm-egg fusion

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#Id: 8260

#Unit 1. Molecules and their Interaction Relevant to Biology

When an instantaneous dipole atom approaches a neighbouring atom, it can cause that atom to also produce dipoles.

The neighbouring atom is then considered to have an induced dipole moment.

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#Id: 4024

#Unit 2. Cellular Organization

Some regions of chromatin are very densely packed with fibers, displaying a condition comparable to that of the chromosome at mitosis. This material is called heterochromatin.

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#Id: 1748

#Unit 4. Cell Communication and Cell Signaling

Expression of class II molecules by B cells is down-regulated by IFN- .

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#Id: 1660

#Unit 4. Cell Communication and Cell Signaling

Naturally occurs when maternal IgG crosses the placenta to the developing fetus.

Maternal antibodies present in breast milk can also provide passive immunity to the infant in the form of maternally produced IgA.