Viruses Complex Molecules or Simple Life Forms Essay Example For Students

Viruses: Complex Molecules or Simple Life Forms? Essay Viruses have been defined as entities whose genomes are elements ofnucleic acid that replicate inside living cells using the cellular syntheticmachinery, and cause the synthesis of specialised elements that can transfer thegenome to other cells. They are stationaryand are unable to grow. Because ofall these factors, it is debatable whether viruses are the most complex ofmolecules or the simplest life forms. While the definition of living organismsmust be adapted, the majority of evidence leads to the classification of virusesas living organisms. Viruses are composed of a nucleic acid core, a protein capsid, andoccasionally a membraneous envelope. The nucleic acid core is composed ofeither DNA or in the case of retroviruses, RNA, but never both. In retroviruses,the RNA gets transcribed to DNA bye the enzyme reverse transcriptase. Theprotein capsid is a protein layer that wraps around the virus. There are fourbasic shapes of viruses. The tobacco mosiac, adenovirus, influenza virus, andt-even bacteriophage are each examples of a different virus structure. Eachindividual protein subunit composing the capsid is a capsomere. We will write a custom essay on Viruses: Complex Molecules or Simple Life Forms? specifically for you for only $16.38 $13.9/page Order now The tobacco mosiac virus has a helical capsoid and is rod shaped. Theadenovirus is polyhedral and has a protein spike at each vertex. The influenzavirus is made of a flexible, helecal capsid. It has an outer membranousenevelope that is covered with glycoprotein spikes. The T-even bacteriophageconsists of a polyhedral head and a tail. The tail is used to inject DNA into abacterium while the head stores the DNA. Basic life is defined as the simplest form capable of displaying themost essential attributes of a living thing. This makes the only real criterionfor life the ability to replicate. Only systems containing nucleic acids arecapable of this phenomenon. With this reasoning, a better definition is theunit element of a continuous lineage with an individual evolutionary history. Because of viruses inability to survive when not in a host, they must haveevolved from other forms of life. The origin of viruses is an easy thing totheorize about so many hypothesese have been made. One such hypothesis is that viruses were once complete living parasites. Over time they have lost all other cellular components. This is backed up bythe idea that all cells degenerate over time. Some people think along very similar lines that viruses arerepresentatives of an early nearly living stage of life. This goes along withthe first hypothesis in that it accounts for a loss of components. Allcreatures that become parasitic can be seen losing their obsolete functions andstructures. An example of this is the flea. Fleas are eveolved from flies buthave discarded their unneeded wings. This theory when applied suggests that atleast some branches ofviruses have evolved from bacteria because of their similar natures. Scientists say that at one point viruses could have been independantorganisms. As they slowly became parasitic, the unsed structures for proteinand energy synthesis were lost, along with the inhibiting cell wall. Whileviruses do need a host cell to complete many important functions of livingorganisms, the should still be considered living themselves. The ability to replicate is important to the classification of anitem as living. Within the host, viruses are able to replicate, evolve, andeven mutate. They are deeply intertwined in the life process by thisdependancy on a host. Viruses are very specific to what they can use as a host. Despitethe specificness, many viruses can host withmembers of different species,genus, and even phylums. A lock and key fit determines the host, or hostrange. This works vert similar to that of an enzymes active site. .u6408b388547cc78e595c6bb92b09f4bd , .u6408b388547cc78e595c6bb92b09f4bd .postImageUrl , .u6408b388547cc78e595c6bb92b09f4bd .centered-text-area { min-height: 80px; position: relative; } .u6408b388547cc78e595c6bb92b09f4bd , .u6408b388547cc78e595c6bb92b09f4bd:hover , .u6408b388547cc78e595c6bb92b09f4bd:visited , .u6408b388547cc78e595c6bb92b09f4bd:active { border:0!important; } .u6408b388547cc78e595c6bb92b09f4bd .clearfix:after { content: ""; display: table; clear: both; } .u6408b388547cc78e595c6bb92b09f4bd { display: block; transition: background-color 250ms; webkit-transition: background-color 250ms; width: 100%; opacity: 1; transition: opacity 250ms; webkit-transition: opacity 250ms; background-color: #95A5A6; } .u6408b388547cc78e595c6bb92b09f4bd:active , .u6408b388547cc78e595c6bb92b09f4bd:hover { opacity: 1; transition: opacity 250ms; webkit-transition: opacity 250ms; background-color: #2C3E50; } .u6408b388547cc78e595c6bb92b09f4bd .centered-text-area { width: 100%; position: relative ; } .u6408b388547cc78e595c6bb92b09f4bd .ctaText { border-bottom: 0 solid #fff; color: #2980B9; font-size: 16px; font-weight: bold; margin: 0; padding: 0; text-decoration: underline; } .u6408b388547cc78e595c6bb92b09f4bd .postTitle { color: #FFFFFF; font-size: 16px; font-weight: 600; margin: 0; padding: 0; width: 100%; } .u6408b388547cc78e595c6bb92b09f4bd .ctaButton { background-color: #7F8C8D!important; color: #2980B9; border: none; border-radius: 3px; box-shadow: none; font-size: 14px; font-weight: bold; line-height: 26px; moz-border-radius: 3px; text-align: center; text-decoration: none; text-shadow: none; width: 80px; min-height: 80px; background: url(https://artscolumbia.org/wp-content/plugins/intelly-related-posts/assets/images/simple-arrow.png)no-repeat; position: absolute; right: 0; top: 0; } .u6408b388547cc78e595c6bb92b09f4bd:hover .ctaButton { background-color: #34495E!important; } .u6408b388547cc78e595c6bb92b09f4bd .centered-text { display: table; height: 80px; padding-left : 18px; top: 0; } .u6408b388547cc78e595c6bb92b09f4bd .u6408b388547cc78e595c6bb92b09f4bd-content { display: table-cell; margin: 0; padding: 0; padding-right: 108px; position: relative; vertical-align: middle; width: 100%; } .u6408b388547cc78e595c6bb92b09f4bd:after { content: ""; display: block; clear: both; } READ: Tennyson as a Victorian EssayOnce the virus has found a host cell, the virus uses the hostsnucleotides and enzymes to replicate its DNA. Other materials and machineryof the host cell produce the viruss capsid proteins. The viral DNA andproteins then join to make a new copy of the virus. While viruses are inactive when in transport between hosts, thearguements are overwhelmingly in favor of considering viruses living organisms. Through their parasitic nature, they are able to fulfill most qualities ofliving organisms. Their behavior and complexness also lead to thisclassification. While they are not the text book example of living organisms,is has been in agreement that there always will be exceptions to the rules. Viruses deserve to take their rightful place among the ranks of living organisms. . Category: Science

AP World History DBQ Essay Sample - Writing Tips

AP World History DBQ Essay Sample - Writing TipsHow can you write an AP World History DBQ Essay Sample that will stand out from the others? That's a good question, because there are a lot of tips to help you on this.One important thing is to make sure that your English grammar is right. Some people can't get a proper sentence out with correct grammar and they can't even sound English. As long as you speak English correctly, you'll be fine.Next, you need to determine how much to use an accent in your English. Most accents that are present in the United States is American accent. Some accents are seen in other places as well, but not in America. So it's best to avoid having too much of an accent.Some people may be more likely to be able to come up with a good essay with more grammar than others. Just remember that in general, it's better to have less grammar in your AP World History DBQ Essay Sample. Because the grammar is also one of the things that the students think is very importan t.Writing an essay is not an easy thing to do. It takes a lot of concentration is the most important thing when writing an essay. So make sure that you're concentrating properly when writing an essay.If you are doing a subject that you are a beginner, then it's better to start from the beginning with it first and find an easy way to start writing. If you don't have any idea what to write about, then it is best to search for easy writing tips that may help you. So you can learn something about writing a topic and this can help you get a better essay.Remember that a lot of the good AP English Literature Teachers do not pay too much attention to grammar or to the style of writing, but if you're a beginner, then do pay more attention to the grammar and style of writing. This will give you an easier time to be more effective with your writing.

Ancient Mayan Civilizations

Ancient Mayan Civilizations The Ancient Mayan Civilization was built upon a rigid social structure based on their religious beliefs. They used a caste social structure in which divisions were based on wealth, inherited rank, privilege, profession, or occupation. Their beliefs were based on the fact that nature elements had the power to either help or harm. The Ancient Mayans used their social structure and beliefs to shape their daily lives.The Maya were a very religious people. They believed in many gods. All events centred around their religious beliefs. They wanted to stay in favour with the gods. In their belief system, the gods would bring the rain, heal the sick, bring plentiful harvests, and ensure the health and safety of the people if they were honoured. If the gods were angry, they would send drought, famine and disaster to the people. In order to keep the gods happy, they believed that a daily sacrifice of blood was necessary.English: National Museum of Anthropology in Mexico...They would open a woun d and let the blood drip onto a paper. The paper would then be burned in an offering to the gods. It was believed that the priests could see the spirits in the smoke. Kings would also give blood offerings, which would please the gods. The Maya had a strong belief in the afterlife. When a king or nobleman died, the Maya people believed that he became one with the gods and would go to live in the sky with them. The Maya worshipped their ancestors as if they were gods. The dead were buried with food, tools, clothing, and whatever would be needed for their journey. Tombs were built to bury their rulers, and sacrifices and special funeral rituals were performed there. Religion was used to explain natural forces that organized the cosmos into an ordered place. Its ideological...

Russia Essay Example | Topics and Well Written Essays - 250 words - 4

Russia - Essay Example Mingst and Ivan, however, argue that the use of conflicting prices was a scapegoat. The actual conflict was due to Ukrainians electing a government in 2005 that was against Russia. The cutting of the gas supply was an indirect way of enacting a sanction to the Ukrainians. Realism best explains Putins behavior. According to Mingst and Ivan, realism is defined as selfish, fearful, and power seeking (79). The main agenda of the realists is to increase their power by either through balance or war. The main agenda of attacking Ukraine was to show Russia’s superiority. Russia aimed to impact into the Ukrainians’ that they should comply with Russia’s demand. Mingst and Ivan argue that Putin uses aggressive and forceful diplomatic measures to other countries as a way to undermine them. With the state of Russia as a superpower, the best way to involve it would be through diplomatic negotiations based on fairness and understanding. If negotiations fail, the international community may seek arbitration. Military support to Ukraine may also be necessary if the former efforts

My Occupational Reseach on Engineering Essay Example | Topics and Well Written Essays - 250 words

My Occupational Reseach on Engineering - Essay Example The expected growth of manufacturing in the United States will positively impact the occupation. The demand for engineers will grow as new technology comes out into the marketplace. To become an engineer one must complete a bachelor’s degree in engineering from an accredited university. The three engineering specialties with the highest demand are civil, electronics, and mechanical engineering. The growth in civil engineering jobs is directly correlated to the growth in construction in the United States. In 2008 there were 1.6 million engineers working in the United States. The specialty with the most jobs was civil engineers with 278,400 jobs. Nearly 36% of the engineers working in the U.S. were employed in manufacturing settings, while 30% were employed in professional, scientific, and technical service industries (Bls). The job outlook for the profession in the near future is positive. Engineering jobs are growing at about the same rate as other professions. The state of the U.S. economy will determine the job growth opportunities for engineers in the near future. The median salary for engineers varies by specialty, but the lowest median salary in 200 8 was agriculture engineering at $68,730

Policy Change Proposal Section II Assignment Example | Topics and Well Written Essays - 750 words

Policy Change Proposal Section II - Assignment Example on would necessitate all health care organizations to have well established internal governing body that directly consult periodically with individuals concerned with organization of hospital medical staff. A requirement for a medical practitioner to be part of hospital’s governing body should be removed to avoid conflict of interests as it may hamper quality service delivery (Tavenner & Sebelius, 2013). There is no provision for establishment of Medicare inpatient rehabilitation facility and an effective long-term acute care quality reporting by either health practitioners or health care organizations. We propose that a secretary in the Ministry of Health and Medical Services would be required to establish an effective quality programs that would facilitate establishment of inpatient rehabilitation and group of providers that would cater for the need of individuals who require long term care in the hospital. Under this policy, all health care providers would be required to identify measures for this provision by 2013 and implement the identified quality measure reporting programs by 2014. These measures would lead to realization of efficient care and all dimensions of quality that are feasible and practicable (Tavenner & Sebelius, 2013). Some regulations passed by Center of Medical Services (CMS) subject hospices to financial and ethical problems. For instance, the current law requires hospices to be well equipped to resuscitate all patients that do not have a signed do-not-resuscitate order. The proposed policy change would ensure that hospice patient would access improved care and financial viability. The eligibility requirements would be re-evaluated to ensure that the policy is no longer a barrier to access. This would ensure that hospice patients access proper health care as they expect (Petersen, 2002). A number of policies and rules in the proposed policy change are aimed at helping hospitals and health care providers to better coordinate care

Macbeth :: essays research papers

Blood Different imagery are seen through out the play one of the imagery is blood.In Macbeth by Wiiliam Shakespear in every scene the image of blood changes, it changes through remores, bravery, and guilt. The characters affected by all of this is Macbeth and Lady Macbeth since they are the ones with blood in their hands. The imagery of blood seens to effected all the characters in the play. One that is affected by all of this is Lady Macbeth, when she is found sleepwalkig and talking to herself after the murder of Duncan and Banquo, " Here the smell of blood still. All the perfume of Aradia will not sweeten this little hands"(5.1.53-55) Shakespear by use of blood makes Lady Macbeth goes crazy by the actions that she has done. Makes it obvious that being evil brings unhappiness and guilt of what she has done in the past. At the beginning Lady Macbeth starts all of this by asking the spirits to, "make thick my blood"(1.5.50) She asking them to make her remorseless and wrong for the actions that is about to do. She did not have the control over har own conscience since she has remorse and guilt over her actions, but it is all ready too late since she has gone crazy and paranoid of blood being on her hands. Macbeth in the other hand has not yet gone crazy, but at the beginning the captain said, " Which smoked with bloody exection"(1.2.20) Shakespear uses blood in a whole defferent way. This time the meaning of blood is of the brave fighter that Macbeth is with the bloody sword he has of his enemies in the battle he fought. This time is shown as a action in which has nothing to do with beginning evil but as a fighter of a country. Macbeth does not shows his true self to his wife and hides in his words he speaks of guilt. "Will all great Neptune's ocean wash this blood clean for my hands?"(2.2.78-79) Macbeth wounders if he will ever forgive his own actions.At the banquet it is when Macbeth shows a little of his guilt of killing Banquo, since his ghost appears to him as a sign of guilt.Shakespear makes this imagery of blood as