confident

• What are the two main types of organisms?

  Prokaryotes and eukaryotes
• How do prokaryotic cells compare to eukaryotic cells?

  Prokaryotic cells are smaller and simpler
• What type of cells are bacteria?

  Bacteria cells are prokaryotic
• What do bacteria cells have instead of a nucleus?

  A single strand of DNA
• What are undifferentiated cells called?

  Stem cells
• What do chromosomes contain?

  Genetic information
• How many copies of each chromosome do body cells usually have?

  Two copies
• How many pairs of chromosomes do humans have?

  23 pairs
• What is diffusion?

  Movement of particles from high to low concentration
• What is osmosis?

  Movement of water through a partially permeable membrane
• How does active transport differ from diffusion?

  Active transport goes against the concentration gradient
• What is osmosis?

  Diffusion of water through a membrane