Lecture 8

Lecture 8 - Lecture 8 Prokaryote Structure and Function#2 1...

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Lecture 8: Prokaryote Structure and Function #2 1. Know the structure and functions of the plasma membrane a. Lipid bi-layer (charged head group which hydrophobic tails) i. Separates two aqueous phases (inside and outside) b. Functions: i. Retains and separates cytoplasm ii. Transports materials in and out iii. Creates gradients (pH, other ions) iv. Asymmetric proteins distribution v. Location of receptors vi. Anchor for major processes (e.g. DNA replication) c. Integral proteins—firmly embedded in the lipid bi-layer (more difficult to remove— requires a detergent) d. Peripheral proteins—along outside of integral proteins (can be removed by simply adding salt or high ionic strength) 2. Know the differences between passive/facilitated diffusion and active transport and group translocation a. Passive diffusion i. As concentration gradient increases, rate of diffusion increases ii. Things that can passively diffuse: 1. Small hydrophobic molecules (N2, O2, aromatics like benzene) 2. Small uncharged polar molecules (water, glycerol)
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Lecture 8 - Lecture 8 Prokaryote Structure and Function#2 1...

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