• How did scientists‘ understanding of cells develop? • What are the main principles of cell theory? Cells and Life • How are prokaryotic cells and eukaryotic cells similar, and how are they different? • What is the function of each organelle? The Cell
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Lesson 1 Reading Guide How did scientists‘ understanding of cells develop? What are the main principles of cell theory? Cells and Life How are prokaryotic.
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• How did scientists‘ understanding of cells develop?
• What are the main principles of cell theory?
Cells and Life
• How are prokaryotic cells and eukaryotic cells similar, and how are they different?
• After Hooke discovered cells, other scientists began making better microscope s and looking for cells in many other places, such as pond water and blood.
• Two German scientists, Schleiden and Schwann separately studied cells and realized that plant cells and animal cells have similar features.
• Two decades later, Rudolf Virchow (a German doctor) proposed that cells come from preexisting cells.
Every eukaryotic cell has membrane-surrounded organelles, which have specialized functions and enable the cell to carry out different functions at the same time.
How are prokaryotic cells and eukaryotic cells similar, and how are they different?
Answer: Both have genetic material, but in prokaryotic cells, the genetic material floats freely, but in eukaryotic cells the genetic material is in the nucleus. Eukaryotic cell is also usually larger than prokaryotic cells.
• Most eukaryotic cells contain mitochondria, where energy-releasing chemical reactions occur.
• Chloroplasts are membrane-bound organelles that use light energy and make food—a sugar called glucose—from water and carbon dioxide through the process of photosynthesis.
• Animal cells do not have chloroplast, but plant cells have both mitochondria and chloroplast.