Cell Biology C

[09821qh]

In chemiosmosis, what is proton motive force?

[c-trast]

In chemiosmosis, what is proton motive force?

Really good question.

Uh, I think it's... (Click to Show Hidden Text)

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.

[bernard]

In chemiosmosis, what is proton motive force?

Really good question.

Uh, I think it's... (Click to Show Hidden Text)

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!

[c-trast]

Yay.

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

Justify your answer (with a bunch of words).

[FidusAchates]

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.

[c-trast]

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)

[Magikarpmaster629]

I'll revive this thread.


How do the different kinds of amino acid side chains affect the 3D shape of the protein?

[watermydoing14]

Answer (Click to Show Hidden Text)

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

[Magikarpmaster629]

Yep

[watermydoing14]

What is the structure and function of the Golgi Apparatus?