Types of flowers

Hypogynous flower- The ovary in such flowers is said to be superior,  e.g., mustard, china rose and brinjal.

Perigynous flower- The ovary here is said to be half inferior. e.g., plum, rose, peach. (Rosaceae)

Epigynous flowers, the ovary is said to be inferior. e.g., guava and cucumber, and the ray florets of sunflower.

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In cells, PI-3 kinase pathway :

Triggers cell division 

Prevents apoptosis

Induces specific changes in cell metabolism

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An important signal transduction protein that binds to PI 3-phosphates is protein kinase B (Akt),  a serine/threonine kinase

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PI-3 kinase was first identified in studies of the 

polyoma virus, a DNA virus

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PKB contains:

A PH domain

A kinase domain

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PH domain of PKB binds with high affinity to the 

3-phosphates in both PI(3,4)P2 and PI(3,4,5)P3

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In unstimulated cells, 

concentration of phosphoinositides is low, and PKB is

inactive because its PH domain physically blocks the kinase active site