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kifflom [539]
3 years ago
8

Membranes prevent movement of most substances between the cell and the environment, but most required substances can be moved Ch

oose one: A. through proteins embedded in the membrane that "recognize" specific substrates and allow their passage. B. by ingesting them. C. by simple diffusion. D. by capturing the substances in specialized pockets of the membrane.
Biology
1 answer:
Darina [25.2K]3 years ago
3 0

Answer:

A. through proteins embedded in the membrane that "recognize" specific substrates and allow their passage.

Explanation:

Some of the membrane proteins serve as transport proteins. These transport proteins can serve as channels, carriers or pumps and allow facilitated diffusion or active transport of the substances across the membrane. ion channels are transport proteins that allow specific ions to move across the membrane since the charged ions cannot cross the non-polar core of the membranes. Most of the ions channels are specific and allow only particular ions to move through them. For example, Na+ ion channels will allow only Na+ ions to move across it while the chloride ions would not able to move through it.

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14 i did that quiz last week
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Following repolarization, the neuron may become slightly hyperpolarized before it re-establishes its resting membrane potential.
RoseWind [281]
<h2>Membrane potential </h2>

Explanation:

  • Membrane potential represents charge difference across the membrane, all biological cells are negative inside (cytoplasm) and positive outside (due to difference in ionic distribution)  
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  • Resting membrane potential of excitable cells is established by Na+ and K+pump
  • Repolarization starts with the efflux of K+ by the opening of voltage gated K+ channels
  • Voltage gated K+ channels starts to open when voltage gated Na+ channels becomes inactive
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  • Additional efflux of K+ occurs due to slow inactivation of voltage gated K+ channels
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