Nobody downloaded yet


Comments (0) Cite this document
The Amoeba proteus is a uni-cellular, relatively large freshwater protozoan, lacking a defined shape. The amoeba as a one-celled organism is able to function efficiently in its environment “despite lacking the levels of organization present in more complex organisms” (Hunter, 2008, p.112). …
Download full paperFile format: .doc, available for editing
GRAB THE BEST PAPER98.8% of users find it useful
Read TextPreview

Extract of sample

Download file to see previous pages This is because its organellar structures perform all the life processes necessary to maintain homeostasis, in a manner similar to the tissues and systems found in multi-cellular organisms. The diagram of the Amoeba (Fig.1) given below clearly indicates all its organs and structures. Thesis Statement: The purpose of this paper is to investigate the uni-cellular Amoeba, and examine how the organism is physiologically suited to its environment. Fig.1. Amoeba proteus: A One-Celled Organism (EnchantedLearning.com, 2010) Physiological Suitability of the Amoeba to its Environment Although amoebas are simple in form, they are highly successful organisms found in abundance in a large variety of habitats across the globe. Amoebas live in “fresh water, the oceans, and in the upper layers of the soil” (Columbia Encyclopedia, 2009, p.1703). Many species of amoebas have adapted to a parasitic life on the body surface of aquatic animals or in the internal organs of both aquatic and terrestrial animals. The protozoan belongs to a much larger group of single-celled organisms called protoctists. There are over 40,000 species of amoeba or amoeba-like forms, most of which have an outer shell or case, and hard internal structures. “Amoebas are considered to be animal-like since they eat other organisms” (MCC, 2000, p.38); they move about and capture their prey by extending their pseudopodia in a process known as phagocytosis or amoeboid movement involving the formation of temporary extensions of the pseudopodia. Pseudopodia used in locomotion and feeding are of various shapes at the tip, they may be rounded, pointed, branched and fused together, or rigid and pointed (Columbia Encyclopedia, 2009). The pseudopodia are flowing extensions of the jelly-like protoplasm of the organism, which form a food vacuole after engulfing a food particle. Amoeba eat “algae, bacteria, plant cells, and microscopic protozoa and metazoa; some ameobas are parasites” (EnchantedLearning.com, 2010). Amoebas can distinguish between the different types of organisms that form its prey, from other materials, and use different strategies in approaching different food (Columbia Encyclopedia, 2009). The food vacuoles ingest the food, digesting the particles with the help of digestive enzymes manufactured and secreted by the organism, which are poured into these vacuoles. The resultant useful chemical compound is absorbed into the amoeba’s body. “Useless residues remain in the vacuoles and are ultimately expelled as the vacuole comes in contact with the membrane at the body surface” (Columbia Encyclopedia, 2009). Egestion is carried out through reverse pinocytosis at the cell’s plasma membrane (Hunter, 2008). The single cell of the amoeba is surrounded by a porous cell membrane through which the organism breathes. Freshwater amoebas constantly take up water through the process of osmosis, and the organism’s water content is regulated by a pulsating contractile vacuole. Marine amoebas do not have a contractile vacuole. Respiration is by a diffusion of gases through the cell membrane (Columbia Encyclopedia, 2009). Oxygen from the water passes into the amoeba, and carbon dioxide leaves through it (EnchantedLearning.com, 2010). Respiration takes place in the mitochondrion, which contains the required enzymes to release energy from food molecules (Hunter, 2008). The cytoplasm is a complex, jelly-like series of folded membranes filling most of the cell (EnchantedLearning.com, 2010). The organism moves with the help of the plasma membrane and the cytoplasm which allow the absorption and circulation of materials. The nucleus is a large, disk-shaped structure which controls the growth and reproduction of the amoeba ...Download file to see next pagesRead More
Cite this document
  • APA
  • MLA
(“BIOLOGY: ORGANISMS Essay Example | Topics and Well Written Essays - 1000 words”, n.d.)
Retrieved from https://studentshare.org/biology/1431192-organisms
(BIOLOGY: ORGANISMS Essay Example | Topics and Well Written Essays - 1000 Words)
“BIOLOGY: ORGANISMS Essay Example | Topics and Well Written Essays - 1000 Words”, n.d. https://studentshare.org/biology/1431192-organisms.
  • Cited: 0 times
Comments (0)
Click to create a comment or rate a document
The carboxyl group of one amino acid is linked to the amino group of the next, and so on. This chainlike molecule, which may range from 50 to several hundred amino acid subunits, is called a polypeptide. A protein may be made up of a
2 Pages(500 words)Essay
The process of using this science of life is a tool to change our future in all walks of life. A fundamental unit of life of all living creatures is a cell. The study of cells is referred as ‘Cell biology. Although a basic biochemical machinery of all
2 Pages(500 words)Essay
Metabolism includes the conversion of nonliving material into cellular components (synthesis) and the decomposition of organic matter (catalysis), producing energy. Growth in living matter is an
2 Pages(500 words)Essay
Those variations that are better suited to survive in a particular environment are selected by nature through the process of natural selection. These organisms in turn produce offspring’s with similar traits and better adaptation to survive. This contributes to the process of evolution.
3 Pages(750 words)Essay
Essay Questions in Biology Table of Contents Question 1- (1) Influence of 19th Century Worldviews on Charles Darwin. (2) How Darwin's Worldview Changed Between 1830 and 1860. (3) How My Worldview Has Been Changed/Affected by the Course 3 Question 2- (1) The Laws of Thermodynamics in My Own Words.
9 Pages(2250 words)Essay
The biodiversity amidst us in the form of bees and other insects that are in some ways responsible for transferring pollen grains from one flower to another have all taken a severe beating. Source: Kluser Stephane and Peduzzi Pascal, 2007, Pollination by bees Worms found in the earth that are responsible for replenishment of the soil by the use of its excreta have also been affected due to constant use of pesticide and other chemicals in our crops.
6 Pages(1500 words)Essay
Genetically Modified Organisms
Based on the fact that the whole issue of GMOs rotates around a process where an organism has its genetic material altered using genetic techniques is in itself a cause for concern on the production, storage as well as the sale of the same. This therefore brings about the question over the possible reasons that bring about transatlantic disputes over GMO regulation.
6 Pages(1500 words)Essay
What is Biology
Though I had read some few documents addressing biology, I did not know the acceptable or scientific definition of biology or any biological terms. As such, before joining the biology class I defined biology as a science subject that
2 Pages(500 words)Essay
Cell Biology
The mechanisms of structuring, energy circulation and reproduction are all based on the formulation of various cells in our bodies. The study of cells is called Cell Biology. The organic cells are of such a small size that they cannot be viewed
2 Pages(500 words)Essay
Theories of Biology
In the modern world today, the theory of inheritance by Mendel’s is the foundation of most studies on diseases which are inherited by children from their parents. In a study by genome scientists in the University
1 Pages(250 words)Essay
sponsored ads
We use cookies to create the best experience for you. Keep on browsing if you are OK with that, or find out how to manage cookies.
Let us find you another Essay on topic BIOLOGY: ORGANISMS for FREE!
logo footer
Contact us:
Contact Us Now
FREE Mobile Apps:
  • StudentShare App Store
  • StudentShare Google play
  • About StudentShare
  • Testimonials
  • FAQ
  • Blog
  • Free Essays
  • New Essays
  • Essays
  • Miscellaneous
  • The Newest Essay Topics
  • Index samples by all dates
Join us:
Contact Us