Which kingdom includes prokaryotic cells?

According to the five-kingdom classification system,blue-green algae are included in which kingdom?

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:

Which of the following is true for Archaebacteria?

Chlorobium vesicle is present in

The main difference between Gram-positive and Gram-negative bacteria lies in the composition of