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Human Biology

Question: The Analysis of Cinchona Alkaloids using reversed phase HPLC with Ultra Violet Diode Array Detection. (Forensic Science Dissertation and Proposal)

Answer: The Cinchona alkaloids are a group of 35 bases found in Cinchona and Remijia species. The principal Cinchona alkaloids, Quinine, Quinidine, Cinchonine, Cinchonidine are termed the Quinoline alkaloids (Gatti et al., 2004). Although cultivated commercially all over the world the Cinchona and Remijia species are indigenous to the Andes. Typically bark contains 7-12% total alkaloids of which Quinine a......(short extract) to download the full answer, please Sign in or Register then make a payment or submit an essay

Question: To what extent can autoimmunity be described as the breakdown of self tolerance and how far have animal models contributed to our understanding of human autoimmune disease?

Answer: Autoimmunity is the propagation of adaptive immunity specific for self antigens. The obligation of preventing such an occurrence was recognised by Ehrlich who described the possibility of ‘Horror autotoxicus’. In his ‘clonal selection’ theory, Burnet proposed that tolerance to self antigens is achieved by clonal deletion or inactivation of developing......(short extract) to download the full answer, please Sign in or Register then make a payment or submit an essay

Question: What are the roles of N- and O-glycans? Use examples to illustrate your answer.

Answer: Although the same glycosylation machinery is available to all proteins which enter the secretory pathway in a given cell, most glycoproteins emerge with characteristic glycosylation patterns and heterogeneous populations of glycans at each glycosylation site. What are the roles of these N- an O-linked glycans?......(short extract) to download the full answer, please Sign in or Register then make a payment or submit an essay

Question: What are polygenic traits and which methods are used to study them? What are complex traits and what methods are used to study them? Discuss their overlap.

Answer: The traits that we all express are the result of both the genes which we inherit from our parents, and the environment in which we live. Some traits have a purely genetic component, and follow the rules of Mendelian inheritance, whereas others show far more complex pedigree patterns. This is largely dependant on the number of genes affecting a certain trait, the interactions between these genes, a......(short extract) to download the full answer, please Sign in or Register then make a payment or submit an essay

Question: What, if anything, would be morally improper about carrying out medical experiments on human embryos with the aim of improving quality of life of subsequent born individuals?

Answer: Embryo experimentation is a relatively new and ground breaking, yet contentious issue, which has inspired much debate in recent years. It involves the use of spare embryos that are created when couples turn to in vitro fertilisation, or IVF, as a means of conceiving when conventional methods prove to be ineffective.......(short extract) to download the full answer, please Sign in or Register then make a payment or submit an essay

Question: Describe the circulation of blood through the heart and explain how the cardiac cycle is controlled.

Answer: The blood circulatory system is responsible for providing a continuous flow of blood throughout the body to provide oxygen and nutrients to the tissues and remove the waste products and carbon dioxide. The circulatory system also acts as a means of transport for hormones and antibodies, and serves to distribute heat. The heart is the pump which tirelessly carries out the task of moving the blood a......(short extract) to download the full answer, please Sign in or Register then make a payment or submit an essay

Question: Adaptive Coordination and Alignment of Eye and Right Hand Do Not Generalise to that of Eye and Left Hand – Evidence from Prism Adaptation

Answer: Under spatial misalignment of eye and hand induced by laterally displacing prisms (15º in the rightward direction), subjects pointed 10 times (one every 5s) at a visually explicit target. Adaptation to the optical misalignment during exposure (direct effect) was rapid; complete compensation for the misalignment was achieved within about 10 trials. In contrast, adaptation measured with the misalig......(short extract) to download the full answer, please Sign in or Register then make a payment or submit an essay

Question: DNA amplification by Polymerase chain reaction (PCR)

Answer: The amplification of a segment of DNA can be achieved using PCR resulting in multiple copies of the target sequence. This occurs in a three-stage cycle consisting of denaturation, annealing and extension from primers, the product of which increases exponentially because the number of new DNA strands is doubled in each cycle. The process is an enzymatic reaction and includes the following compone......(short extract) to download the full answer, please Sign in or Register then make a payment or submit an essay

Question: DNA and Manipulating Reproduction

Answer: If 100 fertilised eggs were planted in 100 females uteri at the correct time in their menstrual cycle, only 18 of these eggs would be born. At a certain point during a female’s menstrual cycle, blisters form within the uterus and mucus is then secreted. The gene that produces this mucus is MUC1 – the mucin gene. This mucus and therefore this gene, is associated with breast cancer, which ther......(short extract) to download the full answer, please Sign in or Register then make a payment or submit an essay

Question: The role of the physiological effector mechanisms of heat stress.

Answer: We have described the physical means by which heat can be exchanged (avenues of heat exchange), and we have described the control mechanisms by which internal temperature can be regulated (mechanism temperature regulation). Heat dissipation is the fundamental problem for regulating organisms exposed to heat stress. Successful tolerance of heat stress requires coordinated responses that facilitate ......(short extract) to download the full answer, please Sign in or Register then make a payment or submit an essay

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Human Biology

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