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Marianna [84]
3 years ago
9

What is the name of a surface membrane molecule that causes an immune reaction

Biology
1 answer:
Varvara68 [4.7K]3 years ago
3 0
The correct answer is Antigen
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An example of negative feed back mechanism is when an increased blood levels of estrogen and testosterone will decrease the leve
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The correct answer is - True.

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The negative feedback loop of the endocrine system is that when a hormone is inhibited by its own mechanism or its products. The negative feedback mechanism in the blood is when the level of testosterone and inhibin inhibit the release of the GnRH, LH, and FSH. The low level of GnRH, LH, and FSH affects spermatogenesis and ovulation in males.

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Urgent!!!
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2 years ago
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We mean that a cell changes to another type of cell.

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<em>Stem cells </em>are a type of cell that has the potential to become a specialized cell, this change or differentiation, is possible thanks to the activation or deactivation of certain genes that promote (or inhibit) the expression of certain proteins that origins different types of cells (fmuscle cells, osteocytes, neurons). This differentiation happens when the cells receive cues internally ( through signals or contact between a group of cells and another or through transcription factors) or externally.

Then, a differentiated cell is a cell that had gone under the previously described process.

I hope this information is useful to you!

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The answer is 4 have a good day
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