7 Answered Questions for the topic membrane transport

Membrane Transport Biology Cell Membrane Cell Biology

08/02/19

What is the purpose of co-transport?

My current understanding of co-transport is that, first, a substance is actively transported across a membrane, establishing a concentration gradient across said membrane. This same substance then... more

07/29/19

Can Oxaloacetate cross the outer mitochondrial membrane?

I am aware of the Malate–Aspartate Shuttle, but something is not clear to me and different sources seem to contradict each other. Some show oxaloacetate (OAA) being reduced to malate in the... more
Membrane Transport Biology Energy Cell Biology

07/23/19

Does endo- and (or) exocytosis require energy? Do they belong to active / passive transport?

I expect vesicle formation and fusion to require energy input; however, I'm not sure about which of endocytosis and exocytosis require energy and how they use the energy input.Do they belong to... more

07/19/19

How do lipid-soluble substances diffuse through the cell membrane?

It’s said that water-soluble substances can diffuse through cell membrane with less ease than lipid-soluble substances because the former encounters impedance in the hydrophobic region of the... more
Membrane Transport Biology Energy Cell Biology

07/11/19

Does endo- and (or) exocytosis require energy? Do they belong to active / passive transport?

I expect vesicle formation and fusion to require energy input; however, I'm not sure about **_which of endocytosis and exocytosis require energy and how they use the energy input_**.Do they belong... more
Membrane Transport Biology Cell Membrane Cell Biology

06/02/19

How can a polar molecule pass through polar channels of proteins in the cell membrane?

To transport a polar molecule through the nonpolar cell membrane, a protein with a polar channel is needed to allow it to diffuse. However, if the molecule is polar and the channel is polar,... more
Membrane Transport Biology Biochemistry Cell Membrane

03/27/19

Membrane Permeability to Pyruvate?

Pyruvate seems to pass easily through the outer membrane of the mitochondrion but has difficulty entering the inner membrane (and gets in by H+ symport). I have two questions: (1) what property of... more

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