Cell Organelles: Nucleus & Ribosomes

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Presentation transcript:

Cell Organelles: Nucleus & Ribosomes Chapter 6; 6.3; Pgs. 102-104 Objective: I can describe the function and parts of the nucleus, DNA, and ribosomes. I can also distinguish between a nucleus and a nucleolus

Nucleus: control center of cell A “ball” containing DNA (type of organelle) Surrounded by a double membrane called Nuclear envelope  thus, nucleus is Holes to allow only certain materials to pass Nuclear pores Allows: proteins, RNA (not DNA)

DNA organized into… Chromosome – DNA (with proteins) wound tightly/condensed into structure Only during cell division Easier to move around Chromatin – DNA (with proteins) unorganized and tangled “Invisible cloud” Normal & accessible Chromosome made of chromatin

Chromatin vs. Chromosomes

Nucleolus – not an organelle Dark region of nucleus (part/structure) Makes ribosomes (specifically – rRNA) Picture Time! Labeling Diagrams!

Difficulty with Nucleus diagrams Is it the nucleus or is it the entire cell?

Difficulty with Nucleus diagrams What are you pointing at? Nuclear envelope Chromatin (DNA) Nucleolus Entire purple structure = nucleus

Chromatin (DNA) Nuclear envelope Nucleolus Nucleus Nuclear pore

Ribosomes – not an organelle…? Semantic arguments: http://www.youtube.com/watch?v=3uBcq1x7P34 Made of RNA + proteins Specifically, ribosomal RNA (rRNA) Function: synthesizes (makes) protein Tiniest structure (dots in pictures)

Ribosome Types Free ribosomes suspended in cytosol Bound ribosomes attached to nuclear envelope or endoplasmic reticulum

Ribosome Types Make Protein Free make protein for within cell (cytosol) Bound make protein for secretion outside cell (or for within other orgnels)

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