Nutrition in unicellular organisms

• what type of nutrition do animal-like protoctista (e.g. amoeba) use?

  holozoic nutrition
• what are amoeba?

  single-celled organisms that have a large surface area to volume ratio
• how does nutrition work in amoeba?

  • they obtain all the nutrients that they need by diffusion, facilitated diffusion or active transport across the cell membrane
  • they take in larger molecules and microbes by endocytosis, into food vacuoles, which fuse with lysosomes, and their contents are digested by lysosomal enzymes
  • the products of digestion are absorbed into the cytoplasm and indigestible remains are egested by exocytosis