What structural feature do epithelia that provide for protection have in common?

1 answer:

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Epithelial tissue constitutes an uninterrupted and continuous layer of cells. They form the linings of organs and body cavities for the protection. Epithelial cells are polarized with an apical surface which opposes the lumen of a tube or the external environment and a basal surface that attaches to the basal lamina. The epithelial tissues are specialized mainly for four functions, one of those function is protection, for this purpose they themselves are being Supported by the Connective Tissues. Epithelial cells are continuously renewed and these cells regenerate themselves with the help of mitosis. Cell linkages are well-employed in epithelial tissues.

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1. Suppose the synthesis of an amino acid was accomplished by four enzymes encoded by four genes that formed an operon. Draw a m

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I have attached lac operon model having 4 genes. See attachment for better understanding.

Answer:

The Lac operon is controlled by two signals.

Initiation

Glucose and lactose concentrations control the initiation of transcription of the Lac operon through their effects on the Lac repressor protein and Cap.

Lactose absent (Repression)

When lactose is absent, the Lac repressor binds the Lac operator and shuts off expression of the operon.

Lactose present (Transcription)

Addition of lactose increases the intracellular concentration of a related compound, allolactose. allolactose binds to the Lac repressor, causing it to undergo a conformational change that releases its grip on the operator DNa.

Glucose absent (Repression)

When glucose is absent, cyclic aMp (red triangle) is produced by the cell and Cap binds to DNA.

Glucose present (Transcription)

LacZ, the first gene of the operon, encodes the enzyme b-galactosidase, which breaks down lactose to galactose and glucose.

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Consider two cells with the same volume but with very different surface areas due to differences in their shapes. the cell with

Allushta [10]

Hello there

the answer to your question is

Be involved in the rapid uptake of compounds from the cell's environment

Hope this helped

Best Regards Queen. Z

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<span> D.all of the above

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