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Tutor profile: Thiago F.

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Thiago F.
Biological Science Ph.D. and Computer Programming Student
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Questions

Subject: Biophysics

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Question:

A quantum dot is a nanostructure (usually semiconductor) whose electrons have their energy quantized, as in an atom. These materials can be used as luminous markers in cells. Once attached to the cell and illuminated with light, these quantum dots act as sources of fluorescent light and their images can be viewed using an optical microscope. This quantum point in one dimension can be studied by considering an electron confined to a potential well. Thus, energy levels can be controlled by changing the width L, the shape and the depth of the potential well. Considering an electron of mass m in an infinite potential well of width L, the wavelength emitted by the transition of an electron between two energy levels (n + 1) and n is given by Note: (c is the speed of light in a vacuum and h = h / 2π and h is the Planck constant).

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Thiago F.
Answer:

4mcL^2/(2n+1)πh

Subject: Biology

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Question:

To be absorbed by the cells of the human intestine, the lipids ingested must first be emulsified. In this stage of digestion, the action of bile acids becomes necessary, since lipids are nonpolar in nature and are insoluble in water. These acids act in the process in order to: a) hydrolyze the lipids. b) act as detergents. c) make the lipids amphiphilic. d) promote the secretion of lipases. e) stimulate the intestinal transit of lipids.

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Thiago F.
Answer:

Bile acids have the function of separating and facilitating digestion. They act as detergents in fats (lipids).

Subject: Anatomy

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Question:

Regarding human heart muscle and blood, judge the following items. The type of contraction of cardiac muscle tissue is similar to that of smooth muscle tissue in the stomach wall.

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Thiago F.
Answer:

True. Smooth muscle tissue, also called non-striated muscle tissue or visceral muscle tissue, consists of mononucleated and elongated cells. This type of muscle can be found on the walls of hollow organs, such as the stomach, uterus, bladder, arteries, veins, blood vessels, and more.

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