Splicing is an SN2 reaction that proceeds through a pentavalent phosphorous intermediate.

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#Unit 10. Ecological Principles

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#Unit 2. Cellular Organization

The principal nuclear transport receptor of mRNPs out of the nucleus is :

A. mRNP exporter

B. Nuclear export factor 1 (NXF1)

C. Nuclear export transporter 1 (NXT1)

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#Unit 2. Cellular Organization

phosphoserine/threonine-binding F-box protein is Skp2, which uses a series of leucine-rich repeats to bind to target proteins only when they are phosphorylated.

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#Unit 5. Developmental Biology

In C. elegans

When sperm fuses with the egg cell membrane, polyspermy is prevented by the rapid synthesis of chitin by the newly fertilized egg.

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#Unit 3. Fundamental Processes

APOBEC3G (A3G)—is a potent inhibitor of infection by a range of retroviruses, including HIV. deaminates Cs to produce Us in that DNA strand, leading to hypermutation at levels the virus cannot accommodate, or even to destruction of the damaged strand by DNA glycosylase and apurinic apyrimidinic endonuclease