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Cell Coat and Plasma Membrane Quiz

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Questions and Answers

What is the typical thickness of the cell coat?

5 to 8 nm
20 to 30 nm
10 to 20 nm (correct)
100 to 200 nm

What chemical compound tends to bind the ions of Ca2+ and Na+ in the cell coat?

Sialic acid (correct)
Glycoproteins
Gangliosides
Oligosaccharides

Where are the glycoproteins of glycocalyx synthesized?

Mitochondria
Nucleus
Ribosomes of RER (correct)
Golgi apparatus

What is the typical length of the fine filaments forming the cell coat in Amoeba?

100 to 200 nm (B) Signup and view all the answers

What is the role of the cell coat in the intestinal epithelium?

Resists vigorous mechanical and chemical attacks (C) Signup and view all the answers

Describe the thickness and composition of the cell coat in Amoeba.

The cell coat in Amoeba is formed by fine filaments that are 5 to 8 nm thick and 100 to 200 nm long. It is chemically composed of negatively charged sialic acid termini on both glycoproteins and gangliosides. Signup and view all the answers

Explain the variability in strength of the cell coat among different cells.

The strength of the cell coat varies from cell to cell. For example, the cell coat of the intestinal epithelium is quite strong and can resist vigorous mechanical and chemical attacks, while in other cells the coat is labile and may be depleted by washing or enzyme exposure. Signup and view all the answers

How does the cell coat undergo continuous renewal?

The cell coat is the secretion product of the cell that is incorporated into the cell surface and undergoes continuous renewal. Signup and view all the answers

Where are the glycoproteins of glycocalyx synthesized and assembled?

The glycoproteins of glycocalyx are synthesized on the ribosomes of RER and their final assembly with oligosaccharide moiety is attained in the Golgi apparatus. Signup and view all the answers