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Cell Sizes & Growth Limitations

Cell Sizes & Growth Limitations. EQ: What factors controls or limit the Cell Size?. 1. Diffusion limits size. 2. DNA content limits size. 3. Surface area to volume ratio limits size. EQ: What controls…Cell Size and Limitations. 1) D______________ limits size.

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Cell Sizes & Growth Limitations

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  1. Cell Sizes & Growth Limitations

  2. EQ: What factors controls or limit the Cell Size? 1. Diffusion limits size 2. DNA content limits size 3. Surface area to volume ratio limits size

  3. EQ: What controls…Cell Size and Limitations 1) D______________ limits size 2) DNA content limits ________ 3) Surface a___________ to v___________ ratio limits size

  4. How does Diffusion limit cell size? An oxygen molecule follows a path to the mitochondria (Oxygen)… plasma membrane  cytoplasm  mitochondria • Smaller size allows the cell to be more efficient

  5. EQ: How does Diffusion limits size?(1) • An oxygen molecule follows a path to the mitochondria. • Oxygen (O2) ….moves from outside the cell through the… pl_______ m_________ to the () c_________________m  m__________________ia • S____________ size allows the cell to be more e_____________.

  6. EQ: How does DNA content limits size? • Cells usually contain only one nucleus • DNA is found in the nucleus • DNA makes RNA • RNA will travel through the cytoplasm to the ribosomes • RNA assists the ribosomes in making proteins • DNA is responsible for the whole above process • If the cell was very large, there would not be enough DNA to support the cell.

  7. EQ: How does DNA content limits size? (2) *if the cell was a very __________size, there would not be enough _________ to support the cell.

  8. EQ: How does DNA content limits size? • Cells usually contain only ______ nucleus -_______ is found in the nucleus - DNA makes _______________ -RNA will travel through the c___________ to the r_____________ • RNA assists the ri____________s in making p_____________. • _________ is responsible for the whole above process

  9. EQ: How does Surface area to volume ratio limits cell size • As a cell increases, it volume increases much faster than its surface area • If a cell doubled, the cell would require 8X more nutrients and have 8X more waste to get rid of • FYI – If E.coli were left unreglated, it could engulf the Earth in one day because it doubles in volume every 30 minutes!!

  10. EQ: How does surface area to volume ratio limits size? • As a cell i__________in size, the volume increases much faster than its S_______________ area

  11. EQ: When do cells divide? • All organisms grow and change. • Cells are constantly growing, dividing, and dying • Some cells divide more than others – • Heart & nerve system cells rarely (if ever) divide • Skin cells, on the other hand, are constantly dividing • Growth is related to cell specificity and activity • If cell growth is uncontrolled – leads to cancer

  12. EQ: When do cells divide? • All organisms g______ and c________ • Cells are constantly growing, d________, and d__________ • Some cells divide more than others – • G_________ is related to cell specificity and activity • If cell growth is uncontrolled – leads to c____________

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