plant cell
This bacterium is likely a denitrifying bacterium. Denitrifying bacteria are able to use nitrate as a terminal electron acceptor in the absence of oxygen, converting it to nitrogen gas through denitrification.
Generally viruses are smaller than bacteria, which are themselves smaller than animal and plant cells. Therefore D is the smallest and is least likely to be visible using an ordinary microscope. See related links for an interactive scale of cells, from the macroscopic to the microscopic, down to a single carbon atom.
High powered, high resolution microscopes.
The bacterium would be less likely to colonize the patient's lower respiratory system.
plant cell
The arrow would likely point to the cylinder lens, which is the objective lens of the microscope. This lens is responsible for magnifying the specimen being observed.
An example of an organism that can only be seen with a microscope is a single-celled organism like bacteria or protists. These organisms are too small to be visible to the naked eye but can be observed under a microscope due to their size.
Robert Hooke found the first cell in a sliced open cork.Under a microscope.
The first cell observed using a light microscope was most likely a cork cell, discovered by Robert Hooke in 1665. This marked the beginning of cell theory and the understanding of cells as the basic building blocks of life.
I'm unable to draw a diagram as a text-based assistant. However, you can easily find well-labelled diagrams of an animal cell observed under an electron microscope by searching online. There are many resources available that provide detailed images and descriptions of the different organelles within an animal cell.
scanning electron microscope
The field of a microscope refers to the area of the specimen or sample that is visible through the eyepiece or camera. It represents the extent of the specimen that can be observed at one time under the microscope's magnification. A larger field of view allows more of the sample to be seen at once, while a smaller field offers higher magnification but limits the visible area.
Structures that can usually be observed in cells in the low power field of a compound light microscope include the cell membrane, nucleus, and possibly some larger organelles like mitochondria or chloroplasts. Other structures like ribosomes or small vesicles may not be visible at this magnification level.
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The Gram stain
The fine focus knob is the labeled part of the microscope that would most likely be adjusted to bring the specimen into sharp focus.