This website uses cookies to ensure you have the best experience. Learn more

View Of The Cell. Essay

822 words - 3 pages

Chapter 7: A View Of The CellCh. 7.1 The Discovery of CellsThe History of the Cell Theory-Before microscopes disease thought to come from supernatural meansCells- the basic unit of living organismsDevelopment of light microscopes-Simple microscopes vs. compoundCompound light microscopes- a series of lenses to magnify objects in steps, magnify up to 1,500 timesThe Cell Theory-Anton Van Leeuwenhoek- first person to record looking at water under a microscope.Robert Hooke- viewed cork, gave us the name "cells"Matthias Schleiden- concluded that all plants are composed of cellsTheodore Schwann- concluded that all animals are composed of cells1. All organisms are composed of one or more cells2. The cell is the basic unit of organization of organisms3. All cells come from preexisting cellsDevelopment of electron microscopesElectron microscopes- uses a beam of electrons instead of light to magnify structures up to 500,000times1. Scanning Electron Microscope (SEM)- scans the surface to show 3D surface images2. Transmission Electron Microscope (TEM)- allows us to see inside cells3. Scanning Tunneling Microscope (STM)- investigates atoms on the surface of a molecule4. Staining, other techniques for contrastTwo Basic Cell Types-- Prokaryotes- organisms made of cells that lack membrane bound organelles- Eukaryotes- organisms made of cells with membrane bound organelles, multicellular plants & animals- Organelles- membrane bound structures with in a eukaryotic cell* Membrane separates chemical reactions* Robert Brown- observed nucleus* Rudolf Virchow- determined nucleus is structure responsible for cell division* Nucleus- central membrane-bound organelle that manages cellular functionsCh. 7.2 The Plasma MembraneProvides a barrier between the internal components of a cell and its external environment.Maintaining a Balance-Survival depends on the cell's ability to maintain the proper conditions within itself.Why cells must control materialsCells need nutrients such as glucose, amino acids, and lipidsPlasma membrane- the boundary between the cell and its environment, to allow a steady supply of nutrients to enter the cell regardless of external conditions.Too much of something, membrane removes it example: ions, wasteHomeostasis- the process of maintaining the cell's environmentSelective permeabality- allows some molecules into the cell while keeping others out.Water freely enters, sodium and calcium ions controlledStructure of the Plasma Membrane-lipids are insoluble moleculesPlasma membrane is a phospholipid bilayer: glycerol backbone, two fatty acid chains, a phosphate groupPhospholipid- lipids with a phosphate groupMakeup of the phospholipid bilayer-Fatty acid tails- nonpolar, head of phosphate is polarTails are hydrophobic, heads are hydrophilic- this forms the barrierFluid Mosaic Model- membrane is flexible, proteins and phospholipids move about the membraneOther components of the plasma membrane-Cholesterols- stabilize phospholipids & keep fatty...

Find Another Essay On View of the Cell.

The View of Pacifism Essay

1775 words - 7 pages The View of Pacifism Works Cited Missing The question of whether or not going to war is appropriate is a pragmatic question that causes controversial answers. A great range of opinions exists to answer this question. The idea that war is never appropriate is called pacifism. Although pacifists have several beliefs in common, different varieties and different variations exist. "Pacifism is not a single unitary theory about war and peace but

Analyzing the Point of View Essay

898 words - 4 pages Analyzing the Point of View One of the most important elements of a story is the point of view that the story is told in. The point of view is critical to determining whether or not the narrator is trustworthy. By analyzing the point of view in “A Rose for Emily” the reader can determine what point of view the story is being told in, how the story will change if it’s told from a different viewpoint, and if the narrator is trustworthy. In the

The Functionalist View of Stratification

1758 words - 7 pages charismatic leaders in shaping societies. In his novel “Protestant Ethic and the Spirit of Capitalism”, Weber developed a thesis concerning the intimate connection between the ascetic ideal fostered by Calvinism and the rise of capitalist institutions. He viewed the Reformation as causing a fundamental reorganization of basic cultural structure of spiritual direction and human point of view. Within the context of his larger questions, Weber

The Christian View of Revelation

1785 words - 7 pages The Christian View of Revelation Revelation by definition is the disclosure of facts or theories through religious events that have previously remained hidden. For Christians revelation is mainly associated with the revelation of God to his people throughout the ages. God has made himself known to us but we have to consider that he has also presented himself to us, with the choice up to us whether we accept his love

The Elizabethan View Of Women

1657 words - 7 pages The Elizabethan View of Women Women in Elizabethan times had few rights or luxuries. Their entire lifestyles depended upon that of their husbands, picked out for them by their fathers. They had almost no say in their lives, and they were expected to be thankful for having someone to rule over them. This is made abundantly clear by Katherina's famous speech in 5.2.137-180 of The Taming of the Shrew. She compares a woman's proper devotion to her

Renaissance View of the Universe

851 words - 3 pages THE RENAISSANCE VIEW OF THE UNIVERSEThrough history people have been very interested in what lay above them. Every night as the people would go to sleep they would look up and wonder, what are those white dots up there? Some of the astrologers who would observe the night sky knowing that the white dots are planets and stars were convinced that the planets had an influence on their people, and so would spend the night trying to find reasons to

The Catholic View of Euthanasia

874 words - 3 pages The catholic view of euthanasia is that euthanasia is morally wrong. it has always been taught the importance of the commandement "you shall not kill". The church has said that "nothing and no one can in any way permit the killing of an innocent person, whether a foetus or an embryo, an infant or an adult, an old person, or one suffering from an incurable disease, or a person who is dying". the church says any law permitting euthanasia

The Evolution of the Cell Theory

915 words - 4 pages all these discoveries, Henri Dutrochet finally steps in and makes the ultimate connection between animal and plant cells. He stated that the cell was not only structural, but also a physiological unit; "It is clear that it constitutes the basic unit of the organized state; indeed, everything is ultimately derived from the cell", Henri stated. Durtrochet also proposed that new cells arrived from old cells, a view that was previously stated by

The Evolution of the Cell Phone

1571 words - 6 pages I remember seeing my first cell phone when I was in college in the early 90's; it was quite large I remember it being grey and resembled something like a half of a cement block. It was rather cumbersome and hard to walk around with, not to mention have a lengthy conversation on. It felt like a refrigerator with a huge antenna and you had to take this around everywhere you went. Such a device of course required a backpack on one's back that could

The Phases of the Cell Cycle

720 words - 3 pages There are four stages when it comes to the stages if the cell cycle. These sections are: G1 which stands for GAP 1 taking approximately 5-6 hours , S phase for synthesis taking approximately 10-12 hours, roughly half the cell cycle time, G2 meaning GAP 2 taking approximately 4-6 hours , and M for mitosis which can take a hour or less. Mitosis is broken down even further into four more phases in itself. These phases of mitosis in order create the

the impact of the cell phone

768 words - 4 pages you travel. It also saves a great deal of time and money by communicating and negotiating business deals verbally, electronically, and efficiently with the touch of your phone. It has the capability to store and access some business files quickly on your mobile device. It has become one of the main tools for businesses. The healthcare industry indicates that there has been an impact from the use the cellular phone. The cell phone allows people

Similar Essays

Stem Cell Research Moral Debate. An Ethical Debate About Stem Cell Research. Inlcudes Both Pros And Cons Of The Issue, Along With The View Of The Catholic Church As Well As A Personal Opinion

1077 words - 4 pages you are on, you can not deny the facts. The fact is, although stem cell research with an embryonic stem cell does kill a human embryo, it provides us with the ability to do many things in science and cure many diseases. With this new technology of stem cell research we will be able to do many great things in the name of science.Within the past few years, stem cell research has taken huge steps and new developments in medicine. However, within the

Nature Of The Cell Essay

1615 words - 7 pages mathematician, physicist, engineer, inventor, and astronomer, invented the new machine called Archimedes’ screw with combining all of his knowledge. Like you can see, cities and machines are related. Some big cities were made by machine, and some machines were made because of the cities. Then, is the cell more like machine or city? To start, we need to discuss about similarities and differences between those two. What is the city? There are many

The Cell Of The Human Essay

2960 words - 12 pages The cell is the smallest unit in the structural hierarchy of life that does every work needed for life (Reec, Urry, Cain, Minorsky, Jackson & Wasserman, 2009). This cell works with other cells in a system to perform other complex process by dividing the functions of performing the complex work to groups of cells. For instance, the process of moving the eyes of the readers while reading this research happens because the activity of the muscle and

The View Of Nature Essay

797 words - 4 pages The Romantics had a unique connection and view of nature. In many ways nature was like a religion to them. They worshiped and cherished nature and its beauty. The contemporary view of nature is largely based on what can be proved by science. People now believe what can be verified by scientists as the truth, but there are a few exceptions to that. Some people now want to protect nature like the romantics wanted to all those years ago. Romantics