Question

7) Fluid mosaic model of the structure of plasma membrane explains
a. single lipid layer in between 2 protein layers
b. a layer of proteins on one side and a bilayer lipids on other side
c. 2 lipids layer and 1 protein layer
d. a middle continuous protein layer​

Answer 1

Answer:

The movement of a substance across the selectively permeable plasma membrane can be either “passive”—i.e., occurring without the input of cellular energy —or “active”—i.e., its transport requires the cell to expend energy.

The cell employs a number of transport mechanisms that involve biological membranes:

Passive osmosis and diffusion: transports gases (such as O2 and CO2) and other small molecules and ions

Transmembrane protein channels and transporters: transports small organic molecules such as sugars or amino acids

Endocytosis: transports large molecules (or even whole cells) by engulfing them

Exocytosis: removes or secretes substances such as hormones or enzymes

The Plasma Membrane and Cellular Signaling

Among the most sophisticated functions of the plasma membrane is its ability to transmit signals via complex proteins. These proteins can be receptors, which work as receivers of extracellular inputs and as activators of intracellular processes, or markers, which allow cells to recognize each other.

Explanation:

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