Androecium

Each anther is usually bilobed and each lobe has two chambers, the pollen-sacs.

The pollen grains are produced in pollen-sacs. A sterile stamen is called staminode

TLS Online TPP Program

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#XL - Q Biochemistry

TLS Online TPP Program

#Id: 8156

#XL - Q Biochemistry

Two different kinds of sorting signals:

Membrane cargo proteins carry cytoplasmic sorting signals

Soluble cargo proteins carry luminal sorting signals

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#XL - Q Biochemistry

Sar1 GTPase drives the pinching off of COPII vesicles

ARF GTPase drives the pinching off of COPIvesicles

Dynamin GTPase drives the pinching off of clathrin-coated vesicles

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#XL - Q Biochemistry

A second function of small GTPases in vesicle formation is in the pinching off of a completed vesicle from the parent membrane

TLS Online TPP Program

#Id: 8152

#XL - Q Biochemistry

After the vesicle coat is complete, the Sec23 coat subunit promotes GTP hydrolysis causes disassembly of the coat.

TLS Online TPP Program

#Id: 8151

#XL - Q Biochemistry

Sec12

acts as a GEF factor for Sar1