Spirochaetes are ...

Given below are two statements:
Statement $I$: Mycoplasma can pass through less than $1 \ \mu m$ filter size.
Statement $II$: Mycoplasma are bacteria with cell wall.
In the light of the above statements,choose the most appropriate answer from the options given below:

Where is the $Flagellin$ protein found?

An organism lacking chlorophyll but able to carry on photosynthesis of organic matter has been found among which one of the following?

In blue-green algae,photosynthesis occurs in .........

During favourable conditions,bacteria mainly reproduce by: