1. Why is the endosymbiotic origin of the mitochondrion considered to have preda

Question

1. Why is the endosymbiotic origin of the mitochondrion considered to have predated that of the chloroplast?

2. A chloroplast derived from a secondary endosymbiotic event is often surrounded by four membranes. Trace the origins of these membranes from innermost to outermost.

First membrane:

Second membrane:

Third membrane:

Fourth membrane:

3. When trying to determine the endosymbiotic origin of a chloroplast, what evidence would lead you to believe the following?

a) primary endosymbiotic event only

b) secondary endosymbiotic event in which the endosymbiont is a green alga

c) secondary endosymbiotic event in which the endosymbiont is a red alga

d) secondary replacement

Explanation / Answer

Answer:

1) The chloroplast are evolved from photosynthetic endosymbionts which has the mitochondria, and mitochondris are evolved from the aerobic endosymbionts. Mitochondris evolved from the endosymbiont related to purple or nonsulfur or photosynthetic bacteria

2)

First membrane: Host Phagocytic vacuole

Second membrane:Plasma membrane of endosymbiont

Third membrane: invaginations of endosymbiontic plasma membrane

Fourth membrane : Invaginations of endosymbiontic plasma membrane

3) Presence of the plastids allow us to believe about cholroplast origin

4)b) secondary endosymbiotic event in which the endosymbiont is a green alga

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