Which of the Following Formations on a Line in an E-R

question 36

Multiple Choice

Which of the following formations on a line in an E-R diagram means that the relationship need not have an entity of that type?

• A) vertical bar
• B) arrow
• C) double line
• D) small oval

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Definitions:

Fimbriae

Short, hair-like structures on the surface of some bacteria that help in attachment to host tissues and in the transfer of genetic material.

Electron Microscope

A microscope capable of producing high-resolution, highly magnified images through the use of an electron beam (rather than light). Transmission electron microscopes (TEMs) produce images of thin sections; scanning electron microscopes (SEMs) produce images of surfaces.

Actinomycetes

A group of Gram-positive bacteria known for their soil-dwelling habits and significant role in the decomposition of organic materials.

Peptidoglycan

A complex polymer found in the cell walls of most bacteria, providing structural strength and shape.