Which type of microscopy is useful for viewing colorless specimens? a. transmission electron microscopy b. light microscopy c. phase contrast microscopy

The correct answer is:

C. Phase contrast microscopy

Phase contrast microscopy is commonly used for examining transparent and colorless objects phase contrast microscopy is a technique that allow a light to pass through a transparent specimen in order to form an image by manipulating the color reflection to our Retina.

Explanation:

The phase contrast microscope is generally used for monitoring such specimens as biological tissues. It is a variety of light microscopy that becomes contrasts of transparent and colorless objects by changing the optical path of light.Phase-contrast microscopy is an optical microscopy method that changes phase shifts in light moving through a crystalline specimen to brightness variations in the image.

cells use diffusion to get substances in and out of themselves. that diffusion will occur across the cell membrane or the outer covering of the cell. because we are talking about the surface of the cell, surface area and volume are  important factors here. as a cell increases in size, its surface area and volume increase as well.  we call that the surface area to volume ratio (sa: vol).  but the catch is that  volume increases at a greater rate than surface  area. in other words, as a cell gets bigger, the sa: vol gets smaller. so a really small cell like bacteria is mostly cell membrane (surface) with very little contents (volume). a really big cell like an egg, is mostly insides with a super thin membrane. so what ends up happening is that the cell cannot efficiently diffuse all of the stuff it needs in/out to survive. therefore cell size is limited to about 100mm. so how do we make organisms bigger than 100mm? cells divide! by dividing and becoming multicellular, organisms are able to grow!   check out the diagrams i attached to see the effect of sa: vol. i hope this ! good luck!