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Aleks04 [339]
3 years ago
6

Which of the following outcomes would be most likely if the membrane of a cell were no longer selectively permeable? Harmful sub

stances would be able to enter the cell and cause mutations to the cell’s DNA. The cell would die as it would not be able to regulate which substances could enter and leave. A cell wall would form outside the membrane to protect the contents of the cell. The cell would grow as more nutrients would be able to easily enter the cell.
Biology
2 answers:
Mazyrski [523]3 years ago
8 0
The correct answer is option B. I just took the test and this was the correct answer!
Ray Of Light [21]3 years ago
7 0
If the membrane of a cell were no longer selectively permeable then "<span>The cell would die as it would not be able to regulate which substances could enter and leave", since a selectively permeable membrane allows both things to enter and leave for the cell's survival. </span>
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Which would least likely be able to cross the phospholipid bilayer of the cell membrane answers?
ruslelena [56]

Answer;

-Large polar molecule are list likely to cross the phospholipid bilayer.

Explanation;

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-Only small uncharged molecules can diffuse freely through phospholipid bilayers. Small nonpolar molecules, such as O2 and CO2, are soluble in the lipid bilayer and therefore can readily cross cell membranes.

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Answer:  Gravity is by far the weakest force we know.

Gravity and weight are not the same thing.

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3 years ago
Which is a mechanism for restricting the movement of proteins in the plasma membrane? Choose one or more:
alexgriva [62]

Answer:

The correct answers are option A. "tethering proteins to the cell cortex", B. "using barriers such as tight junctions", C. "tethering proteins to the extracellular matrix", D. "forming a covalent linkage with membrane lipids", E. "tethering proteins to the surface of another cell"

Explanation:

According to the fluid-mosaic model, the components of cell membranes are in constant movement forming a barrier to avoid unwanted exterior component internalization and to avoid the loss of precious internal components. This constant movement could cause that proteins move across the plasma membrane. But, this is avoided by several mechanisms including:

A. Tethering proteins to the cell cortex. The cell cortex is a rigid structure made of actin and actomyosin. Proteins found in the plasma membrane are tethered to this structure to restrict their movement.

B. Using barriers such as tight junctions. Tight junctions are barriers found in epithelia made of claudin and occludin proteins. These barriers are impenetrable, which avoid the movement of proteins in the cell membrane.

C. Tethering proteins to the extracellular matrix. The extracellular matrix is made of several proteins and macromolecules that provide a structural and biochemical support to cells that are nearby. Proteins could be tethered to this rigid structure as well.

D. Forming a covalent linkage with membrane lipids. The proteins in the cell membrane that form a covalent linkage with membrane lipids are known as lipid-anchored proteins, or lipid-linked proteins.

E. Tethering proteins to the surface of another cell. When cell-cell communication take place it is possible that proteins in the cell membrane got tethered to the surface of the other cell.

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