Dear student,
A. The world's smallest cell is PPLO which is a mycoplasma. PPLO stands for Pleuropneumonia-like organisms.
B. Smallest cell in human body is sperm.
C. The biggest cell in human body is the ovum or egg cell.
D.The cell without the nucleus is RBC or red blood cell.
E. Cell containing two nuclei are muscle fibre cell or liver cell.
F. The chromosome are visible during the prophase stage of the cell division when chromatin condenses to form chromosomes.
Regards