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Outside the Nucleus

Outside the Nucleus. Do Now: Use your lab handout to answer. A student measures the low power field of view of their microscope to be 6.0 mm. A: What is the medium power F.O.V.? B: if about 20 animal cells fit in the medium power field of view, how big is each cell?. Medium power FOV.

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Outside the Nucleus

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  1. Outside the Nucleus Do Now: Use your lab handout to answer. A student measures the low power field of view of their microscope to be 6.0 mm. A: What is the medium power F.O.V.? B: if about 20 animal cells fit in the medium power field of view, how big is each cell?

  2. Medium power FOV • Medium FOV = (low power diameter)(low power objective) / (medium power objective) • = (6.0 mm)(4) / (10) = 2.4 mm

  3. How big are the cells? • (Medium FOV) / (# cells) x 1000 • = 2.4 mm / 20 x 1,000 µm / mm = 120 µm

  4. Label the cell membrane (aka plasma membrane), nucleus, and nucleolus on your diagram

  5. About those ribosomes… • Very important function: RIBOSOMES MAKE PROTEINS! They can be found in both eukaryotic & prokaryotic cells

  6. Steps in Protein Production • An RNA copy of DNA is made in the nucleus • A type of RNA called mRNA moves out of the nucleus into the rough endoplasmic reticulum (RER) • Ribosomes attached to the rough ER use the mRNA instructions to build a protein • The protein moves to the smooth ER for further processing. The smooth ER houses other chemical reactions too.

  7. Homework: • CELL OBSERVATION LABS DUE TOMORROW!

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