Concept explainers
Which of the following cellular structures is not easily visible with the compound light microscope?
- nucleus
- DNA
- cytoplasm
- plasma membrane
Introduction:
The biological microscope uses light to observe the cellular structures that are not visible by the naked eyes. It consists of two lenses: the eyepiece and the objective lens to form the image. The microscope uses visible light for the illumination of the object, and then the image is magnified by the lenses. The resolving power is 0.2µm and 1500x is the highest magnification of the light microscope.
Answer to Problem 1PL
Correct answer:
The correct answer is option (b) DNA.
Explanation of Solution
Explanation/justification for the correct answer:
Option (b) DNA. An electron microscope is used to observe the DNA molecule, which has a resolution of 0.2 nm, which makes it easier to observe the smaller units. In contrast, the typical light microscope is limited to the resolution of only 0.2 µm. Hence, it is not easy to observe the DNA molecule. So, the correct answer is option (b).
Explanation for incorrect answer:
Option (a) nucleus. The nucleus is the controller of the cell and is the darkly stained body that can be easily visible under a light microscope. So, this is an incorrect option.
Option (c) cytoplasm. The cytoplasm is observed under the light microscope, which is the part of the cell consisting of all the cell organelles. The cytoplasm can be easily identified in a stained cell. So, this is an incorrect option.
Option (d) plasma membrane. The plasma membrane is the covering of the cell that encloses all the living components of the cell. The membrane can be visualized by staining the cell. So, this is an incorrect option.
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