Cells_core_mod (3).pptx - Cells Cells All living organisms...

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Cells Cells
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All living organisms consist of cells. Some living organisms have just one cell. Some living organisms have trillions of cells. Cells are the fundamental units of life.
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What does it mean to say something is alive?
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What does it mean to say something is alive? All living organisms share five fundamental characteristics: Energy All organisms acquire and use energy Cells All organisms are made up of membrane-bound cells Information All organisms process hereditary information encoded in genes as well as information from the environment Replication All organisms are capable of reproduction Evolution Populations of organisms are continually evolving
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Based on what we just talked about, answer the following: Are Viruses Alive? A. Yes B. No
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Are Viruses Alive? Viruses are structures containing protein and DNA or RNA surrounded by a protein coat They infect living cells, take them over, and force them to replicate the virus Since they lack the ability to self replicate & generate energy, they are not considered to be alive nor are they cells
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Lytic vs Lysogenic Cycles
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Properties of ALL Cells Plasma Membrane Cytoplasm DNA Ribosomes Cytoskeleton
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Cells can be grouped into two categories All cells on Earth can be classified into two general kinds: 1. Prokaryotic cells Bacteria Small, simple cells Single celled 2. Eukaryotic cells Plants, animals, fungi and protists Larger, more complex cells Single celled or multicellular
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What kind of organism are you? A. Prokaryotic B. Eukaryotic C. Both prokaryotic and eukaryotic
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The human body has about 50 trillion human cells. It also serves as a host for many species of bacteria. What is the ratio of human cells to bacterial cells in and on the human body? A. 100 to 1 (100 x as many human cells as bacterial cells) B. 10 to 1 (10 x as many human cells as bacterial cells) C. 1 to 1 (1x as many human cells as bacterial cells D. 1 to 10 (10 x as many bacterial cells as human cells) E. 1 to 100 (100 x as many bacterial cells as human cells)
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The human body has about 50 trillion human cells. It also serves as a host for many species of bacteria. What is the ratio of human cells to bacterial cells in and on the human body? 50 trillion = 50,000,000,000,000
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Human Microbiome
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Prokaryotes
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All prokaryotes are relatively simple single- celled organisms There are two domains of prokaryotes: Bacteria and Archaea.
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  • Fall '17
  • Michael Miller
  • Biology

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