Cell Biology C

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Re: Cell Biology C

Postby 09821qh » September 18th, 2014, 3:44 pm

In chemiosmosis, what is proton motive force?

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Re: Cell Biology C

Postby c-trast » November 30th, 2014, 12:59 pm

In chemiosmosis, what is proton motive force?
Really good question.
Energy from a proton gradient. 
    In chemiosmosis, the movement of protons from the intermembrane space into the matrix, going through the ATP Synthase channels and generating energy.
Last edited by c-trast on January 4th, 2015, 7:39 am, edited 1 time in total.
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Re: Cell Biology C

Postby bernard » December 17th, 2014, 8:48 am

In chemiosmosis, what is proton motive force?
Really good question.
Energy from a proton gradient. 
    In chemiosmosis, the movement of protons from the intermembrane space into the matrix, going through the ATP Synthase channels and generating energy.
edit: NO, cell bio...Don't die on us. We need to keep this going...
Chemiosmosis is the movement of ions across a selectively permeable membrane, down their electrochemical gradient. More specifically, it relates to the generation of ATP by the movement of hydrogen ions across a membrane during cellular respiration or photosynthesis.
Though 09821qh has not responded, your answer looks correct to me, so go ahead and ask a question!
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Re: Cell Biology C

Postby c-trast » December 17th, 2014, 6:21 pm

Yay.

True or false? As temperature drops, cells put more saturated fatty acids in their membranes.

Justify your answer (with a bunch of words).
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Re: Cell Biology C

Postby FidusAchates » January 10th, 2015, 8:42 am

False. As temperature decreases, the cell produces more of the unsaturated. The double bonds in the hydrophobic tails create bends/kinks in the tails, preventing compact storage at lower temperatures. This maintains membrane fluidity and membrane fracture. A good example: fish that live in cold water have a higher concentration of unsaturated lipids per cell than fish that live in warmer climates.

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Re: Cell Biology C

Postby c-trast » January 10th, 2015, 8:56 am

False. As temperature decreases, the cell produces more of the unsaturated. The double bonds in the hydrophobic tails create bends/kinks in the tails, preventing compact storage at lower temperatures. This maintains membrane fluidity and membrane fracture. A good example: fish that live in cold water have a higher concentration of unsaturated lipids per cell than fish that live in warmer climates.
Yes!

Go, son.

(& another note, you needed to hide your answer)
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Re: Cell Biology C

Postby Magikarpmaster629 » February 18th, 2015, 7:06 pm

I'll revive this thread.


How do the different kinds of amino acid side chains affect the 3D shape of the protein?
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Re: Cell Biology C

Postby watermydoing14 » February 20th, 2015, 5:27 pm

The sequence of amino acid side chains affects the secondary and tertiary structure by forming hydrogen bonds in different locations of the polypeptide chain, affecting where alpha helices and beta sheets will be formed and where the alpha helices and beta sheets will be attracted to each other
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Re: Cell Biology C

Postby Magikarpmaster629 » February 21st, 2015, 12:47 pm

Yep :D
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Re: Cell Biology C

Postby watermydoing14 » February 21st, 2015, 6:24 pm

What is the structure and function of the Golgi Apparatus?
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