How many of the following structures are membrane-bound?
Endoplasmic reticulum,Golgi apparatus,Ribosomes,Lysosomes,Mitochondria,Microbodies,Centrioles,Nucleolus,Vacuoles

Which one of the following pairs is correctly matched?

Which of the following statements are incorrect?
$(i)$ Plant cells have centrioles which are absent in almost all animal cells.
$(ii)$ Ribosomes are the site of protein synthesis.
$(iii)$ The middle lamella is a layer mainly of calcium carbonate which holds the different neighbouring cells together.
$(iv)$ In animal cells, steroidal hormones are synthesized by smooth endoplasmic reticulum.
Of the above statements:

According to the modern colloidal theory,the cytoplasm is a polyphasic colloidal system. Who first proposed this?

In an animal cell,protein synthesis occurs in . . . . . . .

Cell organelles are separated by the method of . . . . . . .