Comments by "Ginny Jolly" (@ginnyjollykidd) on "Jam's Germs"
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Here the mouth might be shaped already and be an appendage while in other organisms (amoebas, e.g., that put out engulfing parts of itself that look like fingers that surround the food.
We rarely see it in 3-D, tho. If we did, it would look more like a baseball glove surrounding a ball and trying to close all the way around it.
But like us holding the ball in our glove, the amoeba can't make it a part of itself yet. So it holds the food in a ball of outside environment in its outer membrane pinched off to hold the food, kind of like bunching it up in a garbage sack.
In that "sac" or vacuole, the amoeba sends digestive chemicals in, and freed nutrients are brought to the cell proper. When the prey is finished, the vacuole joins with the outer membrane again, and any waste is released, too.
Oh! And look up clathrin and clathrin cages! So. Cool!
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