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Aleksandr [31]
2 years ago
9

Please Help! What change do we get in membrane potential as a result of acetylcholine binding to nicotinic receptors on skeletal

muscle cells?
Depolarization or Hyperpolarization​
Biology
1 answer:
WARRIOR [948]2 years ago
5 0
Binding of acetylcholine to nicotine cells acetylcholine receptors triggers a rapid increase in permeability of the membrane to both Na+ and K+ ions, leading to DEPOLARIZATION.
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Oceania, South America, and Southeast Asia.

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In sickle-cell disease, as a result of a single amino acid change, the mutant hemoglobin tetramers associate with each other and
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Answer:

The correct answer is - altered primary and quaternary structure; secondary and  tertiary structure may or may not be altered.

Explanation:

a) Primary structure: It is fundamentally the amino acid sequence or arrangments. Every protein has a remarkable amino acid sequence and little change in these sequence modifies the primary structure. On account of sickle cell, the amino corrosive has changed, and henceforth the essential structure of the protein molecule changes.  

b). secondary structure: It is the folding of the primary structure chain, which results from intermolecular and intramolecular hydrogen holding of the amide group. Ex; Alpha helix and beta sheets. In the above case, this may or might not have changed as there is no conclusive method to know this.  

c) Tertiary structure: Most proteins' tertiary structures are mixes of a-helices, b sheets, and circles and turns. Every protein has interesting three-dimensional structure, folded in a particular way now and then known as a domain. For our situation, since it depends on the optional structure, it might have changed.

d) Quaternary structure: It is the relationship of numerous individual protein chains into a solitary protein with various subunits. The subunits arrangment offers to ascend to a steady structure. For our situation, a hemoglobin tetramers partner with one another and gather into large fibers. This has changed the first structure and accordingly we state the quaternary structure has changed.

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Which of the following best explains why a cell's plasma membrane is composed of two layers of phospholipids rather than just a
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A phospholipid is made up of two ends a hydrophilic or water-loving end that is phosphate head and a hydrophobic tail that is made up of fatty acid tail. The arrangement of phospholipid in a bilayer structure allows the entry of oxygen, carbon dioxide, and lipids to pass through them via concentration gradient via simple diffusion.

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