Lecture - Sep 09

Lecture - Sep 09 - B iology 09/09/09 Quiz first lab....

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Biology – 09/09/09 Quiz first lab. Nucleus - Chromatin (DNA and protein – makes up the chromosomes) - Nucleolus – site of ribosome assembly Eukaryo – possesses a nucleus - Nuclear envelope with nuclear pores Chromosomes are always there. Chromosomes look like a thread-like material when cells are dividing. Chromosomes are made of chromatin. Little machines are assembled called ribosomes. The whole nucleus is enclosed by a double membrane called the nuclear envelope . TEM microscope – you see the interior Don’t ignore the scale bar. Nuclear envelopes have a lot of nuclear pores. There’s protein in there that makes the passage selective. The ribosomes are very small structures. All protein synthesis takes place outside the nucleus. - Nucleus - Cytoplasm (cytosol – fluid component of cytoplasm) Endomembrane system (within the plasma membrane) - plasma membrane - nuclear envelope - endoplasmic reticulum - ER - golgi complex - vesicles - lysosomes - vacuoles Endoplasmic reticulum - Rough ER – there are ribosomes that are attached to the membrane
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- Smooth ER – it’s only membrane, with no ribosomes Lumen = internal space Can only be seen with TEM. Rough ER synthesizes. Ribosomes are making proteins that are used for special purposes. Some ribosomes flow freely and help make proteins.
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Lecture - Sep 09 - B iology 09/09/09 Quiz first lab....

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