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# Outside the Nucleus PowerPoint PPT Presentation

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.

Outside the Nucleus

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## 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

• Medium FOV = (low power diameter)(low power objective) / (medium power objective)

• = (6.0 mm)(4) / (10) = 2.4 mm

### How big are the cells?

• (Medium FOV) / (# cells) x 1000

• = 2.4 mm / 20 x 1,000 µm / mm = 120 µm

Label the cell membrane (aka plasma membrane),

nucleus, and nucleolus on your diagram

• Very important function:

RIBOSOMES MAKE PROTEINS!

They can be found in both eukaryotic & prokaryotic cells

### 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.

### Homework:

• CELL OBSERVATION LABS DUE TOMORROW!