EEG waves are not action potentials.

The EEG waves originate from alternating excitatory and inhibitory synaptic potentials that produce sufficient extracellular current flow across the cortex.

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#Unit 4. Cell Communication and Cell Signaling

In resting cells, 

GSK3 is catalytically active which phosphorylates and inhibits glycogen synthase, thus blocking glycogen synthesis from glucose

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#Unit 4. Cell Communication and Cell Signaling

In presence of insulin, 

GSK3 becomes phosphorylated by PKB its catalytic activity is inhibited

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#Unit 4. Cell Communication and Cell Signaling

Insulin stimulated activation of PKB promotes rapid activation of glycogen synthase and glycogen synthesis

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#Unit 4. Cell Communication and Cell Signaling

Mating pathway in the yeast S. cerevisiae, is a MAP kinase cascade which linked to GPCRs.

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#Unit 4. Cell Communication and Cell Signaling

Two mating types of yeast cells are: 

1. a 

2. α

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#Unit 4. Cell Communication and Cell Signaling

Haploid yeast cells secrete protein signals known as pheromones, which induce mating between opposite mating types.