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University Degree: Applied Biology

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  • Marked by Teachers essays 2
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  1. Marked by a teacher

    Should a DNA profile be taken at birth?

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    The process of electrophoresis is used to gather 'non coding DNA' (areas of short tandem repeats, STRs) using restricting enzymes. There are two common methods of separation and detection, capillary electrophoresis and gel electrophoresis Almost 99.8% of our DNA is identical; accordingly this process focuses on that .2% that is different. 3 Crime scenes and paternity tests alike can be an influential factor in determining if someone was involved or is a relation respectively. Within the controlled paternity environment sufficient DNA can be obtained but under the contamination and pressures of a crime scene the process becomes increasingly difficult.

    • Word count: 1264
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    They may coexist with a decrease in their potential for growth. Neutralism is the most common type of interspecific interaction. Neither population affects one another nor are any interactions that do occur indirect or incidental. Amensalism is when one species suffers and the other interacting species experiences no effect at all. This is may be viewed as a very asymmetric form of competition. Mutualism is an interspecific interaction between two species, which benefits both members. Populations of each species grow, survive and may or may not reproduce at a higher rate in the presence of other species.

    • Word count: 1152
  3. This experiment was carried out to separate and characterize the protein mixture which contained haemoglobin and serum albumin using two different methods, SDS-polyacrylamide gel electrophoresis (SDS-page) and ion exchange chromatography (IEC)

    Ion exchange chromatography i. Determination of haemoglobin in protein mixture Table3. The absorbance of haemoglobin in each eluent fraction of DEAE column Test tubes 1 2 3 4 5 6 7 8 9 10 Diluted sample Absorbance, 595nm 0.003 0.004 0.019 0.035 0.059 0.072 0.078 0.060 0.039 0.033 0.321 Concentration of haemoglobin, �g/ml 25.71 34.29 162.86 300.00 505.71 617.14 668.57 514.29 334.29 282.86 917.14 Mass of haemoglobin, �g 25.71 34.29 162.86 300.00 505.71 617.14 668.57 514.29 334.29 282.86 - Table4.

    • Word count: 3708
  4. Isolation & Characterisation of Proteins. The purpose of conducting this experiment is to study protein separation using two different methods, which are the SDS-polyacrylamide gel and ion exchange chromatography

    = -52.836 x + 139.1 x = = 1.780 Molecular weight = 101.780 = 63.083 Another band in sample B migrated 91 mm 91 = -52.836 x + 139.1 x = = 0.910 Molecular weight = 100.910 = 8.135 For sample C, when the protein fragment has migrated 7 mm, 45 = -52.836 x + 139.1 x = x = 1.781 Molecular weight = 101.781 = 60.392 Another band in sample C migrated 92 mm 92 = -52.836 x + 139.1 x = x = 0.891 Molecular weight = 100.891 = 7.788 Part B: Ion-Exchange Chromatography Determination of haemoglobin i)

    • Word count: 4085
  5. The Germ Theory of Disease. In the nineteenth century when the distribution of microscopes became widespread, the sheer degree of microbial life forms was more apparent and thus the two questions Does spontaneous generation occur? a

    Redi did this by setting out meat in a variety of flasks, with varying degrees of coverings, from being completely open to the air to being fully sealed, he did this experiment in order to prove his theory that maggots developed from eggs that were laid by flies. After his experiment he concluded that maggots only emerged from the flasks the flies could reach the meat and lay their eggs, proving his hypothesis correct (Evers C. and Levine R. 2009).

    • Word count: 1856
  6. Lab report: food dehydration. This experiment focuses on the follow four questions: 1, to calculate the moisture contents on the dry basis of carrot and potato samples; 2, to assess the possible influence of pre-dehydration such as blanching on the qua

    Whether the pretreat process will influence the quality of final product should be carefully assessed. Besides, dehydrated food requires rehydration before cooking and eating and whether the rehydrated food can maintain the same consistency as the original fresh food should also be considered. 2. Objectives This experiment focuses on the follow four questions: 1, to calculate the moisture contents on the dry basis of carrot and potato samples; 2, to assess the possible influence of pre-dehydration such as blanching on the quality of final products; 3, to investigate why rehydrated foods cannot reconstitute to the same consistency as the original fresh food; 4, to study to association between AW and food preservation.

    • Word count: 3105
  7. According to researchers at the Center for Genomic Regulation, disruption of the circadian rhythm (the bodys natural biological clock) increases skin cells susceptibility to forming tumors and aging quicker due to the lack of cell regenera

    Correctly functioning stem cells are essential for supporting healthy tissue, including dermal tissue, during the life of an organism. Every day, skin cells are exposed to various harmful agents such as ultraviolet rays and pathogens. The function of the skin is to protect from such dangers, while being an impermeable barrier that separates the inside of the body from the outside world. The study showed that when a circadian rhythm is interrupted, the stem cells lose their capacity to replace dead skin cells because the genes Bmal1 and Period 1/2 prevent the cells from knowing when to execute the appropriate functions.

    • Word count: 889
  8. X-rays are typically used in the field of scientific research, industry, and medicine. They have become a crucial tool in medical imaging

    It has been said that x-rays should only be performed when absolutely necessary because it can cause an increased exposure to radiation and therefore lead to cancer. Shu et al. (2002) and Grufferman et al. (2009) discovered that in utero and postnatal exposure to x-rays can lead to childhood leukemia but only with increased exposures to x-rays during pregnancy.

    • Word count: 732
  9. Digestion

    The oesophagus is a passageway that carries food from the mouth to the stomach. Food moves along the tube by muscle contractions called peristalsis. The stomach is seen as the core of digestion where, physical and chemical digestion both take place; gastric juices containing enzymes and HCl work on the food material whilst muscles churn the food. The stomach has sphincters at both the entrance and exit of the stomach (cardiac and pyloric respectively) to contain food and release it in small amounts to the rest of the digestive tract.

    • Word count: 1459
  10. The functional part of the kidney are called the Nephrons, in each of the kidney there are about 1 million functional Nephrons, they control the molecules that passes through the kidney and also filter the kidney. Each of the nephron composed of six regio

    As the filtrate travels along the nephron, additional impurities are removed, and the filtrate is concentrated into urine for the purpose of expressing waste products and excess water. The things which are removed are urea, salt water and glucose. However blood cell or larger proteins that is too big or that are negatively charged cannot pass through the capillaries of the Bowman's capsule, therefore retaining the protein in the circulation. Water balance is maintained in the body through the kidney as it is maintains its level.

    • Word count: 1609
  11. Isolation and Purification of Egg White Proteins

    9.5 Volume of supernatant containing ovalbumin and conalbumin (mL) 7.1 Volume of saturated ammonia sulphate added to supernatant (mL) 7.1 Isolation of Ovalbumin Volume of Ovalbumin + H2O, mL 7.9 Volume of saturated (NH4)2SO4, mL 7.9 Volume of Ovalbumin after dialysis, mL 19.5 Isolation of Conalbumin Volume of supernatant containing Conalbumin, mL 98 Mass of ammonium sulphate used (g) 7.840 Volume of Conalbumin after dialysis, mL 15 Calculations: Mass of ammonium sulphate required to produce 8% (w/v) solution = 8% x 98 = 7.840 g Week 2 Volume of egg white used = 26.5mL Volume of sodium bicarbonate buffer added = 26.5 x 4= 106 mL Total volume = 132.5 mL Isolation of Lysozyme A Volume of Lysozyme A,

    • Word count: 1992
  12. Mad cow diesease

    A prion is defined as a proteinaceous infectious particle that lacks nucleic acids. There are four levels of to a protein structure, which need to be understood before prions could be learned about. The primary structure consists of a repeating sequence of N-C-C. The secondary structure has an alpha helix, and a beta sheet. The tertiary structure is the final three-dimensional structure of a protein. The quaternary structure consists of multiple polypeptides bound together by covalent bonds into a single larger protein.

    • Word count: 494
  13. Discuss the biology of Alzheimers disease

    tangles and a sticky protein known as beta amyloid forming amyloid plaques, which surrounds the debris during nerve cells in the brains (Small D H & Barrow C J, 2007). The significant loss of cells and volume in the regions of the brain occurs in the hippocampus, affecting the short-term memory of the brain and the cerebral cortex affecting the languages skills and ability to make judgments (Longe, 2006, p141). Cooper (2003) suggests that it is the formation of the amyloid plaques and neurofibrillary tangles that are responsible for neuronal loss.

    • Word count: 2653
  14. Discuss the use and effects of anabolic steroids on the human body

    In basic operant conditioning terms there can either be two forms of punishment, positive or negative. Positive involves the addition of an aversive stimulus, following a specific behaviour and negative involves the removal of a favourable stimulus, following a specific behaviour (Ferster, Culbertson & Boren, 1975). The more frequently used form is positive punishment and can be defined in the context of learning as a reduction in the likelihood of a response occurring due to the presentation of an adverse stimulus (Leiberman, 2000).

    • Word count: 2144
  15. Free essay

    The Importance of the Human Nervous System. The NS is possibly one of the most important systems in the evolution of multi-cellular organisms allowing cells, tissues, organs and even organisms to communicate and regulate both their internal and external e

    It consists of the spinal cord and the brain which are isolated from the rest of the body as they are located wholly within the vertebral canal and the skull.(4) (3) When problems arise within the NS they can normally be categorized by following the different levels of neuroanatomy, (6) for example a person who is confused may have a disturbance affecting the cerebral hemispheres (Appendix 1). (6) The dominant hemispheres (left in right-handed people) controls speech, the non-dominant hemisphere provides spatial awareness.

    • Word count: 2315
  16. Estradiol Injections Induces Vitellogenin mRNA in Male Fish

    The central dogma has become the backbone of molecular biology since its creation in 1958. This process, which states that information in biological systems flow in one direction: from DNA to RNA (transcription) and from RNA to proteins (translation), is the framework for understanding the transfer of sequence information between sequential information carrying biomolecules such as: DNA, RNA, and proteins (Dorfleur and Bohm, 2006). All the structural and functional processes in a living cell revolve around this mechanism. It explains that the ribosome in the cytoplasm uses mRNA, a mobile copy of a gene transcribed from RNA, to assemble the required polypeptide.

    • Word count: 1622
  17. Purification of proteins using hydrophobic interaction chromatography.

    The popular techniques include ion- exchange chromatography which separates ions and charged molecules, affinity chromatography which focuses on the separating proteins by their binding specificities, size- exclusion chromatography separating proteins according to their molecular mass, hydrophobic interaction chromatography and reversed phase chromatography exploiting on the hydrophobic properties of the proteins. (Poole 2003; Bonner 2007; Lehninger 2005). The aim of this essay is to provide different aspects of protein purification using hydrophobic resins. Proteins have different sequence of amino acids present in them and their structures include primary, secondary and tertiary.

    • Word count: 1683
  18. Functionality of Cardiac and Skeletal Muscles

    They are also both striated and when stimulated, can cause action potentials. This means that they both follow the sliding-filament model, which is based on the interactions between the proteins myosin and actin. Actin makes up the thin filaments of a myofibril, while myosin makes up the thick filaments and together with the help of ATP, causes a muscles to physically contract (Campbell pg 1106). Despite having the same basis for contraction, cardiac and skeletal muscles are very different. Cardiac and skeletal muscles can only be found in certain places of the body.

    • Word count: 2363
  19. Biology Notes

    The repetition of the word "All" indicates that everyone suffered and the onomatopoeia of "hoots" and "dropped" allow the reader to hear the guns, even though the soldiers do not. The tone of the poem then changes in the 2nd stanza. The soldiers, earlier seen as "old hags", are suddenly boys again struggling to get their gas masks on. Owen combines the two ideas in contrast to show us how youth is suddenly aged by the war. He uses descriptive verbs such as "stumbling", "yelling", "fumbling" and "drowning" to enable the reader to experience the actions and sounds of the war first-hand which further help to demystify its glory.

    • Word count: 3467
  20. Guide to Intermediate Bodybuilding

    One of the most common mistakes made by people who wish to be healthy or lose weight is drastically cutting calories. Although it seems logical for a person who wishes to lose weight to eat less, this might actually cause a somewhat negative affect for a person. The reason for this having a negative affect is because by drastically cutting your calories you are causing your metabolism which burns calories for you, to slow down significantly which means you burn less calories overall.

    • Word count: 1202
  21. Osmosis in Potatos

    The concentration of sap in the sap vacuole of a potato cell is approximately 10% - 15%. I intend to place a predefined weight of potato cells (0.15g) in varying concentrations of sucrose solution (0%, 20%, 40%, 60%, 80%), to see the effects of osmosis in the cells of a potato in varying levels of sucrose solution. The potato cores will be prepared, weighed and then placed in the solution and left for a certain amount of time, they will then be removed, re-weighed and the difference in weights calculated and plotted, and a conclusion reached. I have done some preliminary work into osmosis in potato cells.

    • Word count: 1713
  22. Healthy Eating - Comparing Supermarkets

    The larger superstores are often out of town; however they have large car parks offering free parking. The local stores are in the community and are therefore accessible to the local communities. Sainsbury's offer online shopping, with delivery direct to your home. A free bus service is provided by out of town shopping centres where Sainsbury's stores are located. Sainsbury's also support rural communities through the Sainsbury's Assisting Village Enterprises (SAVE) scheme, which helps support small independent shops and post offices providing essential services in rural areas by enabling these shops to sell non-perishable products from the Sainsbury's store.

    • Word count: 1540
  23. Hydrolysis of Starch

    The iodine tests for starch, and it turns blue/black in the presence of starch. The iodine test is done by adding a drop of iodine into a small sample of what needs to be tested. In the Benedict's solution test, it tests reducing sugars such as glucose. The Benedict's test is done by adding a small amount of Benedict's solution is added to the sample and then place it into a boiling water bath, if the blue solution of the Benedict's test produces a coloured precipitate (yellow or green to red, or brown), then the test is positive for the detection of a reducing sugar (Department of Biology, 2009).

    • Word count: 2954

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