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Discuss the benefits of event-driven programming. Contrast event-driven programming with procedural programming. Discuss how messages from other programs can be viewed as events. Give examples. Give examples of tasks that require the program to guide the user. Should programs be purely event driven, procedural, or a mixture of both? Why? Solution The benefit of event-driven programming is that it\'s very intuitive and naturally well-suited to applications whose control flow are based, not on its structure, but rather on internal or external events. This is why event-driven programming is so popular with GUI programming. Likweise, SOA and client-server architectures are naturally event-driven as well. We if we find contrast between Procedural and event-based then applications written in procedural languages execute by proceeding logically through the program code, one line at a time. Logic flow can be temporarily transferred to other parts of the program through the GoTo, GoSub, and Call statements, directing the program from beginning to end. In contrast, program statements in an event-driven application execute only when a specific event calls a section of code assigned to that event. Events can be triggered by keyboard input, mouse actions, the operating system, or code in the application. For example, consider what happens when the user clicks a command button named Command1 on a form. The mouse click is an event. When the Click event occurs, Visual Basic executes the code in the Sub procedure named Command1_Click. When the code has finished running, Visual Basic waits for the next event. Messages from other programs/threads can be seen as events, as they trigger some instance of code to execute..

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In biology, the roles of transition metal ions can be broadly grouped into two classifications: redox chemistry (catalysis, electron transfer, etc.) and acid-base chemistry (catalysis, structural, etc.). A) List three metal ions that commonly participate in biological redox chemistry, and give examples of how they participate. B) Compare this list to metal ions commonly participating in acid-base chemistry. Discuss the overlap of these two groups of metal ions. (e.g. Why are some used for one of these functions and not for the other?) C) List some common biological ligands of these metal ions. Can you see patterns that would allow you to group these ligands into sets with common properties, or that bind common metals? D) Why are trace metals used for these biological functions, and not other more-abundant elements like C,N,O, etc? Solution (a) iron, copper, cobalt, manganese etc are used in biology redox reactions like molecular di oxygen, superoxide, hydrogen peroxide thus inhibiting the effect or formation of these compound by use of the certain other enzymes.. (c) the ions and the Ligands for them are Ike gluthaione peroxide which can bind to chromium, arsenic etc.. Iron binds to ferrodoxin which is associated with the photosynthesis.. (d) transition metals are used because they have empty d-orbitals in with them due to which they can easily transfer or accept the electrons or exchange the electrons among the metals and enzymes.. Which is not possible in other trace metals like carbon, nitrogen etc...

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Explain how recombination increases the amount of genetic variation in offspring: Explain why it is not possible to have a recombination frequency of greater than 50% (half recombinant progeny): A second pair of Drosophila are mated. The female is Cucu YY (straight wing, gray body), while the male is Cucu yy (straight wing, yellow body). Assuming recombination, perform the cross and list the offspring genotypes and phenotypes. Solution Que-3: The recombination frequency is the measure of genetic linkage at different loci. The value of recombination frequency is 50% if the chromosomal genes are located at different regions on the different chromosome because of independent assortment. If the genes are located closely together on the same chromosome, then those genes considered as genetically linked; because they have not assorted independently due to \"crossing over\", then the recombination frequency value is less than 50%. Linked genes are due to linkage often do not obey Mendel\'s laws of inheritance such as independent assortment because of \"crossing over with reciprocal exchange of hereditary genetic material meticulously in between non-sister chromatids\" at the time of \"synapsis formation\" (propahse -I) in reduction division or meiosis 1. These events are leading to formation of gamete cells with complete different genotypically from diploid parent reproductive cell via meiosis finally induce \"genetic variation\" in phenotype due to \"fertilization\" events between sperm cells & ovum. The recombination of chromosomes enables meiosis process of cell division with the generation of novel recombinant nucleotide -sequences by crossing over during the cell division in both unicellular and multicellular species. Sometimes, double strand breaks in DNA during homologous chromosomal recombination may be produced due to exposure any harmful radiation finally may cause higher genetic variation via duplication followed by fertilization to form a phenotype with higher genetic variation Que-4: Crossing over is somewhat randomly distributed over the length of the chromosome because if the two genes are close together then it is very change to get exchange of chromosomal breaks therefore, if the two genes are located farther apart then there will be higher room for the exchange of genetic material with chromosomal breaks. Therefore, when two genetic are far apart on the same chromosome are more likely to have a crossover between them than two loci that are close together. This recombination frequency is considered as a measure of genetic linkage during the crossover of the homologous chromosomes. Linkage disequilibrium defined as the existence of alleles at different loci with the absence of genetic linkage between them even though there is no equilibrium with allelic frequencies independently. The recombination frequency is the measure of genetic linkage at different loci. The value of recombination frequency is 50% \"if the chromosomal genes are .

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