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3 years ago

Through which microscope were cells first observed?

Biology

2 answers:

sasho [114]3 years ago

6 0

The microscope which was used to visualize the cells for the first time was the compound microscope.

Further Explanation:

The cell theory explains that <u>the cells together make up a living organism. </u>The cells are formed from already existing cells and are <u>the basic structural unit of life. </u>Over time, the introduction of microscopes and their continuous improvements helped in the discovery of cells due to the advanced magnification technologies. Earlier, <u>glass was used to see an enlarged image of an object.</u> Later, <u>different eyeglasses were used to see images but with limited magnification.</u> It was around 1620 when the first compound microscope was introduced, which makes use of an objective lens along with the eyepiece lens to visualize a real image with higher magnification.

A compound microscope has a compound lens system that helps in high magnification. It has two lenses: the objective lens and an eyepiece lens. Both lenses work together to make an enlarged image. <u>While the lenses work to create a magnifying image, a condenser, on the other hand, focuses, is present under the stage and functions to focus the light onto the sample. </u>

The compound microscope is also known as biological microscopes as they are used to visualize living cells and other biological samples. Some of the compound microscopes are:

Phase-contrast microscope: It is used to see blood cells or bacteria using a phase-contrast objective lens and a phase condenser.
Fluorescence microscopes: These microscopes use the light of different wavelengths to produce fluorescence for the study of the sample.
Metallurgical microscope: It uses the reflected light and transmitted light, which passes through an objective lens to study the specimen.

Learn More:

Learn more about the treatment of eukaryotic cell with a drug <u>brainly.com/question/10767798 </u>
Learn more about the proteins synthesis in a cell <u>brainly.com/question/1420458 </u>
Learn more about the exchange of gases by blood cells <u>brainly.com/question/1213217 </u>

Answer Details:

Grade: High School

Chapter: The Cell Theory

Subject: Biology

Keywords:

Cell theory, cells, structural unit, microscope, compound microscope, objective lens, eyepiece lens, condenser, magnification, biological microscope, phase contrast microscope, metallurgical microscope, fluorescence microscope.

poizon [28]3 years ago

3 0

Compound microscope

<h3>Further explanation</h3>

In 1665, Robert Hooke used a compound microscope to observe cells. Hooke observes the cell walls of dead plants (in the form of cork) when they appear under a microscope. He named it the cell because it looked similar to a cellula or small room inhabited by monks.

Development of microscopy:

1590: Hans and Zacharias Janssen, as Dutch lens grinders, mounted two lenses in a tube to produce the first compound microscope.
1660: Robert Hooke published <em>Micrographia</em>, containing detailed observations of biological materials made with the best compound microscope.
1676: Anton van Leeuwenhoek was the first person to observe a live cell under a microscope, i.e., the algae Spirogyra.
1931: Ernst Ruska constructed the first electron microscope. With the invention of the electron microscope, many infectious agents smaller than bacteria could be seen.

Until now, we can see how important the use of microscopes, especially in microbiology, that is the study of microorganisms.

<h3>Learn more</h3>

How was the water filtered to remove debris and living organisms? brainly.com/question/5646770
About the single bonds in fatty acids brainly.com/question/1386856
The theoretical density of platinum which has the FCC crystal structure. brainly.com/question/5048216

Keywords: compound microscope, Robert Hooke, cells first observed, cork, dead plant, walls, Anton van Leeuwenhoek

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A certain segment of DNA can be used as a molecular clock. Its rate of mutation is one mutation per 15 million years. Examine th

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<h3><u>Answer and explanation;</u></h3>

This can be done by<u> DNA sequencing which is the process of determining the accurate order of nucleotides within a DNA molecule</u>.
By doing a DNA sequencing for the two sequences of DNA from the two species it will help compare the number of random mutations which have occurred in a molecular clock in the two species - that is, seeing how different the sequences are.
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Species A: GTTGAGCTAGTATGGACC

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3 years ago

Write a good paragraph about what you already know about Earth’s air, water, solid Earth, and life on Earth. Please use complete

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Answer:

The air present on earth is a mixture of gases which is mostly nitrogen and then oxygen.

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Explanation:

The air present on earth is a mixture of gases which is mostly nitrogen and then oxygen. Other gases present include carbon dioxide, water vapor, and noble gases. Oxygen is the gas needed to sustain life on earth.

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3 years ago

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If there is less water in the bottle, then the note played is lower because there is more air to move around.

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Rapid vibrations (high frequency) that reach your ear are categorized as a "higher" pitch, while slower vibrations (low frequency) are categorized as a "lower" pitch.

When you tap a glass of water with a pencil or spoon the water molecules vibrate and create sound waves through the water. More water means slower vibrations and a deeper tone.

The bottle with the most water will have the lowest pitch while the bottle with the least water will have the highest.

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PLEASE HELP ASAP!! 10 POINTS