nutrition in unicellular organisms

• give an example of a protoctist


  an amoeba
• What is holozoic nutrition?


  this is the digestion where large molecules of food is converted into to smaller absorb able molecules
• what is a key characteristic about unicellular molecules


  they have a large surface area to volume ratio
• what nutrients do unicellular organisms absorb through the cell membrane


  oxygen and glucose
• what are the the ways in which nutrients are passed though the cell membrane


  diffusion , facilitated diffusion and active transport
• how do unicellular organisms take in large food molecules such as bacteria and microscopic algae


  endocytosis
• what are food molecules that are surrounded by membranes called


  vacuoles
• what do food vacuoles fuse with and what do they contain


  they fuse with lysosomes that contain hydrolytic enzymes
• what is the function of hydrolytic enzymes


  these digest the contents of the food vacuoles
• after food vacuoles are broken down what happens to the smaller food molecules


  they are absorbed into the cell cytoplasm
• by what process are indigestible food molecules egested

  exocytosis
• by what process are indigestible food molecules egested

  exocytosis