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Question 1. Deoxyribonucleic acid or DNA is the chemical basis of inheritance. It is composed of nucleotides, has a double helix structure and relies on ribonucleic acid or RNA to get its information out to the cell. But the RNA has only one strand while DNA has two. Explain why you think DNA has two strands while RNA has one strand. Relate this to how your own DNA gives you certain characteristics that other members of your family share or don't share. Question 2. Cell division is a well-regulated process that has a specific sequence of events. This sequence of events is controlled by the DNA in the nucleus of the cell. One result of the breakdown of the control system of the cell cycle is cancer. Name three types of things in today's world might cause a breakdown in the control system that regulates cell division? Explain how this control system is modified by these three things in such a way that cancer results? Question 3. During reproduction, genes are transferred from the parent organisms to the offspring, whether they are tomato seeds or baby walruses. Scientists have learned how to isolate genes and insert them into cells without using the parents. Genes may now be transferred from one organism to another by artificial means. These genes are then incorporated into the new cells and direct the life of those cells. Choose an organism and describe one of the potential risks or benefits of the current genetic engineering technology that involves that organism. The organism may be bacteria, plant or animal, but it must be the result of genetic engineering.
Calculate the intrinsic fluorescence lifetime τ0 from the following decay curve if the quantum yield is 0.5.
A continuously growing population has a population size of 1,000 and an intrinsic rate of increase of r = 0.05 per year. Assuming that this rate of increase remains the same, about how long should it take for the population to reach 4,000?
Albinism, an autosomal recessive trait characterized by an absence of skin pigmentation, is found in 1 in 4000 people in populations at equilibrium.
The plasma membrane acts as a barrier in cells of all types to control the movement of substances into and out of the cell. a) Explain how the plasma membrane acts as a semi-permeable barrier to various types of molecules based on its molecular st..
Bone marrow contains at least three populations of stem cells. How do you isolate HSCs from human bone marrow separately from the other two then and discuss the structural and functional changes of Ichemic stroke.
In a population of 100, 25 individuals are homozygous dominant. How many individuals would be expected to be homozygous recessive?
Your friend is trying to generate an in vitro system for studying the formation of COPII vesicles. He finds that to get well-organized vesicle budding from artificial membranes, he needs to add the coat proteins, the Sar1 GTP-binding protein.
Meiosis explains Mendel's laws. Explain the phenotype of a mutant in the cell cycle that would disrupt Mendel's first law
Suppose the environment in which a population was living changed in some way and the new conditions were much more harmful to homozygous dominant individuals and to heterozygotes than to homozygous recessive?
Cathy wishes to undergo maternal serum screening. She is also strongly opposed to abortion. A friends argues that she is inconsistent. Is her friend right?
Give the definition of enzyme and its structure?
A triploid cell containes sets of three homologous chromosome is a cell of used chromosome per cell is triploid this cell would be expected to have which of the.
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