Q: A student calculates the resolution of a compound light microscope using the formula $\text{Resolution} = \frac{0.61 \times \lambda}{NA}$, where $\lambda$ is the wavelength of light and $NA$ is the numerical aperture. If $\lambda = 550$ nm and $NA = 1.25$, what is the resolution?

$\frac{0.61 \times 550}{1.25} = 268.4$ nm

Question 1

Which of the following best describes the primary function of tight junctions in epithelial tissue?

Accepted Answer

They prevent the movement of water and solutes between adjacent cells.

Question 2

A scientist is examining a tissue sample under a compound light microscope with a 40x objective lens and a 10x ocular lens. What is the total magnification being used?

Accepted Answer

$40 	imes 10 = 400$

Question 3

Which type of epithelial tissue is most likely to be found lining the alveoli of the lungs, where rapid diffusion of gases occurs?

Accepted Answer

Simple squamous epithelium

Question 4

Which of the following is NOT a function of epithelial tissue?

Accepted Answer

Conducting electrical impulses

Question 5

A pathologist observes that the cells in a tissue sample are arranged in multiple layers, with the most superficial cells being flat and irregularly shaped. Which type of epithelial tissue is this?

Accepted Answer

Stratified squamous epithelium

Question 6

Which microscope technique would be best for viewing the ultrastructure of organelles within a cell at a magnification of 300,000x?

Accepted Answer

Transmission electron microscope (TEM)

Question 7

Which of the following best explains the concept of 'polarity' in epithelial cells?

Accepted Answer

Epithelial cells have distinct structural differences between exposed and attached surfaces.

Question 8

Which type of intercellular connection is primarily responsible for allowing ions and small molecules to pass directly from one cell to another, facilitating rapid communication?

Accepted Answer

Gap junctions

Question 9

A tissue sample is observed to have cells that are taller than they are wide, with nuclei located near the base of the cells. Which type of epithelial tissue is most likely present?

Accepted Answer

Simple columnar epithelium

Question 10

Which of the following best describes the role of desmosomes in epithelial tissue?

Accepted Answer

They provide strong adhesion between adjacent cells, resisting mechanical stress.

Question 11

Which of the following is a correct sequence for the levels of organization in the body, from smallest to largest?

Accepted Answer

Atom → Molecule → Cell → Tissue

Question 12

A researcher wants to study the surface features of a cell in three dimensions. Which microscopy technique should they use?

Accepted Answer

Scanning electron microscope (SEM)

Question 13

Which of the following is a characteristic feature of simple cuboidal epithelium?

Accepted Answer

Cells are as tall as they are wide, with centrally located nuclei.

Question 14

Which of the following is a function of glandular epithelial cells?

Accepted Answer

Production of specialized secretions

Question 15

A student calculates the resolution of a compound light microscope using the formula $	ext{Resolution} = \frac{0.61 	imes \lambda}{NA}$, where $\lambda$ is the wavelength of light and $NA$ is the numerical aperture. If $\lambda = 550$ nm and $NA = 1.25$, what is the resolution?

Accepted Answer

$\frac{0.61 	imes 550}{1.25} = 268.4$ nm

Question 16

Which of the following best describes the function of hemidesmosomes?

Accepted Answer

They anchor epithelial cells to the basement membrane using integrins.

Question 17

Which of the following is a major difference between endocrine and exocrine glands?

Accepted Answer

Endocrine glands secrete hormones directly into the bloodstream; exocrine glands secrete their products onto epithelial surfaces via ducts.

Question 18

Which of the following cell junctions is most likely to be abundant in tissues that experience high mechanical stress, such as the skin?

Accepted Answer

Desmosomes

Question 19

Which of the following statements about epithelial tissue is TRUE?

Accepted Answer

Epithelial tissue covers surfaces, lines cavities, and forms secretory glands.

Question 20

A patient has a genetic defect affecting the proteins in gap junctions. Which physiological process is most likely to be impaired?

Accepted Answer

Rapid electrical communication between cardiac muscle cells

Tissue Level of Organization: Epithelial Tissue and Microscopy

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