Is active transport required for all living cells tofunction?
I was under the impression that if a cell doesn't have activetransport, it either would lose molecules through the membrane andnot be able to maintain a proper gradient, or molecules would betrapped inside the membrane (waste) or outside the membrane(food).
Is active transport required for all living cells tofunction?
I was under the impression that if a cell doesn't have activetransport, it either would lose molecules through the membrane andnot be able to maintain a proper gradient, or molecules would betrapped inside the membrane (waste) or outside the membrane(food).
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Cellular biology answer check. please check if my answers arecorrect or not.
1) The concentration of ions inside a cell is the same as theirconcentration outside of the cell. True or false? (i chose falsesince having equilibrium inside a cell is bad)
2) Membrane transport proteins...
a)...transport membrane potentials between cells |
b) | ...transport membranes from the ER to the Golgi |
c) | ...are made up of phospholipids |
d) | ...transport molecules across membranes |
i chose d
3)The electrochemical gradienttakes into account:
a) | The concentration of solutes on either side of themembrane. |
b) | The overall charge on either side of the membrane. |
c) | Both of these. |
i chose C. (although i am sure that overall charge matters, Iwasn't sure if concentration of solutes are taken account.)
4) If no energywere expended by an animal cell:
a) | Both gradients would be depleted |
b)The K+ gradient would maintain itself. |
c) | None of these |
d) | The Na+ gradient would maintain itself. |
I chose d) mainly because I think Na+ gradient exist in animalcell and not K+ gradient.
5) Which of the following is a true statement aboutactin?
a) | Once actin has polymerized, it never depolymerizes. |
b) | Actin is a transmembrane protein. |
c) | Actin can form branched networks. |
d) | Actin filaments are organized into hollow tubes. |
I chose c. can't explain why.
6)Ion channels:
a) | Form a hydrophobic channel through the membrane |
b) | Have filters that let sugars through |
c) | Are selective for particular ions (only the |
1,Match the descriptions to the type of transport.
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2,Describe what is wrong with the following statement and explain why:
All prokaryotic and eukaryotic cells contain plasma membrane, nucleus, ribosomes, organelles, cytoplasm, and cell walls.
What is short-distance transport?
a, | The movement of solutes from a region of low concentration to a region of high concentration | |
b,The movement of water, nutrients, and other substances between cells | ||
c, | The movement of substances from a region of high concentration to a region of low concentration | |
d, | The movement of water across a semipermeable membrane from a region of low solute concentration to a region of high solute concentration. |
What terms describe the movement of water across a semipermeable membrane from a region of high water concentration towards a region of low water concentration (and high solute concentration.)
What is found in the proptoplasm?
Cell wall, cytoplasm, plasma membrane, nucleus, and other cell organelles | ||||||||||||||||||||||||||
Plasmodesmata, cell wall, and plasma membrane | ||||||||||||||||||||||||||
Cell wall, cytoplasm, and plasma membrane | ||||||||||||||||||||||||||
Cytoplasm, nucleus, and other cell organelles The channels that allow nutrients and protoplasm to pass between plant cells are called _________________. What happens when a plant cell is placed in a hypotonic solution?
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