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scZoUnD [109]
3 years ago
11

As a general rule elements in group 18 do not form compounds. consider the following section of the periodic table. which of the

following explains why elements in group 18 do not readily form compounds
DUE TODAY HELP PLS !

Biology
1 answer:
LiRa [457]3 years ago
6 0

Answer:

I NEED SOME POINTS TO ASK A QUESTION.

Explanation:

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20 POINTS<br> describe the outer core layer of the earth please dont copy from somewhere else
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<u>The outer core of the Earth is a liquid layer and it is mainly made up of the metals iron and nickel. </u>

<u>It's also made up of small amounts of other substances. </u>

<u>The outer core is responsible for Earth's magnetic field. </u>

<u>The outer core is the second layer of the Earth.</u>

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Plants can be grown experimentally without light. what key supplemental ingredient is needed for this to occur?
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What are the genes involved in pattern formation and organization of body parts?
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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.

6 0
3 years ago
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