EVERYDAY SCIENCE

Detailed explanation-1: -Protists may have animal-like cell membranes, plant-like cell walls, or may be covered by a pellicle. Some protists are heterotrophs and ingest food by phagocytosis, while other types of protists are photoautotrophs and store energy via photosynthesis.

Detailed explanation-2: -The cell membrane is surrounded by a cell wall in all bacteria except one group, the Mollicutes, which includes pathogens such as the mycoplasmas. The composition of the cell wall varies among species and is an important character for identifying and classifying bacteria.

Detailed explanation-3: -Human cells have a surface membrane (called the cell membrane) that holds the contents together. However, this membrane is not just a sac, it is an active participant in the life of a cell.

Detailed explanation-4: -Both the cells contain membrane-bound organelles. Moreover, the Plant, bacteria and animal cells, three have ribosomes that contain RNA and proteins. The Ribosomes primarily translate the nucleic acids into amino acids to form proteins.