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Presentation transcript:

Announcements Quiz in recitation tomorrow: figure/discuss i>clicker: this week start to gain ec points Contracts?, Carbonless, GATTACA ec Stand up if completed reading (8 pages)

Question: What does a membrane transporter do?

Question: What does a membrane transporter do? What’s the difference between BOUND and FREE ribosomes?

A. Bound ribosomes are enclosed in their own membrane B. Bound and free ribosomes are structurally different. C. Bound ribosomes generally synthesize membrane proteins an secretory proteins. D. The most common location for bound ribosomes is the cytoplasmic surface of the plasma membrane E. All of the above What’s the difference between BOUND and FREE ribosomes?

Question: What does a membrane transporter do? Which structures are NOT part of the endomembrane system?

A. Nuclear Envelope B. Chloroplast C. Golgi Apparatus D. Plasma Membrane E. ER F. None of the above Which structure are NOT part of the endomembrane system?

Question: What does a membrane transporter do?

Question: What does a membrane transporter do?

Ummm, nice pictures ‘art boy dude’ but, what does a membrane transporter do?

Diffusion

HELLO! So, what does a membrane transporter do?

Facilitated Diffusion

Water follows solute (salt) HEY!

Diffusion of water is called waaa? Osmosis

Osmosis (diffusion of water)

If the membrane is permeable to water and monosaccharides… 1. Which solutes will diffuse into the cell? A.sucrose B.fructose C.glucose An artificial cell with an aqueous solution enclosed in a selectively permeable membrane has just been immersed in this beaker.

If the membrane is permeable to water and monosaccharides… 2. In which direction will water move? A.Into the cell causing it to swell up B.Out of the cell causing it to shrink C.Equally in both directions An artificial cell with an aqueous solution enclosed in a selectively permeable membrane has just been immersed in this beaker.

ISOTONIC HYPERTONIC HYPOTONIC

ATP ADP + P Active Transport binding hydrolysis release

Based on the model of sucrose uptake shown, which of the following treatments would increase the rate of sucrose transport into the cell. a. Decreasing extracellular sucrose concentration. b. Decreasing extracellular pH c. Decreasing cytoplasmic pH d. Adding an inhibitor that blocks the creation of ATP. e. Adding a substance that makes the membrane more permeable to H+ cytoplasmoutside cell

Who Cares What relevance is “water follows salt?”