INTRODUCTION TO CELLS THE MICROSCOPE The invention of the _____ microscope in th
ID: 168800 • Letter: I
Question
INTRODUCTION TO CELLS THE MICROSCOPE The invention of the _____ microscope in the _____ century allowed us to discover the existence of cells. What is the "typical size" in diameter of most cells? _________ What is the minimum resolvable by the unaided eye? _______ Can any types of cells be seen by the unaided eye? ______ What is the minimum resolvable by the light microscope? ______ Why is that the limit of resolution for the light microscope? ________ What cellular components can we see at that level? ________ What is the minimum resolvable by the electron microscope? ______ What are the 4 steps that must be taken to prepare the tissue that to be viewed under the electron is microscope? ______ What cellular components can we see at that level? _______ What are the 2 major types of electron microscopes? ________ EUKARYOTIC CELLS What are the 2 main ways that prokaryotic cells differ from Eukaryotic cells? _____ Why do Eukaryotic cells have (need) such an extensive system of internal membranes? What is the most prominent organelle in a eukaryotic cell? ______ Why is the term "nuclear envelope" better than nuclear membrane? ______ Besides the nucleus, where else in a eukaryotic cell might I find DNA? _______ What is believed to be the origin of mitochondria? ________ Why? __________Explanation / Answer
The invention of the light microscope in 16th century allowed us to to discover the existence of cells.
Typical diameter of most cells Is between 10 and 100 micrometers.
The angular resolution of unaided eye is about 1 arcminute or 0.0003 radians.
Unaided eye can see an amoeba, proteus, a human egg and a paramecium without using magnification under right conditions.
Minimum resolution of a light microscope is 1 mm.
Light microscopes use visible light,which has a minimum wavelength of 400 nm. Limit of resolution is half the wavelength of microscope’s illumination source. Therefore, limit of resolution of a light microscope would be approximately 200 nm
Using a light microscope, one can view cell walls, vacuoles, cytoplasm,chloroplasts, nucleus and cell membrane.
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