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Q1. Johnny fractured lower third of his right tibia in a skiing accident. The soft tissues in the area were severely damaged and their surgical removal was necessary. After prolonged immobilization, it was found that Johnny was healing extremely poorly. Why did Johnny have poor healing?
Q2. Assume you have engineered a set of genes, each encoding a protein with a pair of conflicting signal sequences that specify different compartments. If the genes were expressed in the cell, predict that signal would win out for the following combinations. Give details your reasoning.
What two groups of organisms live symbiotically to form lichens? Of what benefit are mycorrhizal fungi to plants? How does this symbiotic relationship benefit the fungus.
Why does changing concentrations of ions change equilibrium potential and changing permeability affect threshold? You might want to discuss the Nernst Equation vs the Goldman equation.
Assume that we have a population of three yellow phenotypes, three blue phenotypes, and three green phenotypes. A yellow phenotype then immigrates into the population. What are the genotype and allele frequencies after the immigration?
Describe the process of viral replication; discuss both normal and retroviruses, and comment on the implications of this process for genetic engineering.
In humans, mitosis generates new cells for the growth and although mutations are the ultimate source of the genetic variability.
Distinguish between the rate of speciation in a higher taxon and its rate of diversification. What are the possible relationships between the present number of species in a taxon,
if many trees are removed from a forest by logging, what is the most immediate effect on the carbon cycle in that forest?
Define homeostasis. Why feedback is important? Can you design a system without any feedback? What would be the advantages/disadvantages of such system?
Which type of bacterium would be most likely killed in the presence of oxygen?
The phosphorylation and dephosphorylation of proteins is a vital means of regulation. Protein kinases attach phosphoryl groups, whereas phosphatases remove phosphoryl group from the target protein. What is the energy charge of this kind of covalen..
When KBr is placed in an aqueous solution, which of the following becomes oxidized?
How long would the channels need to stay open in order to raise the cytosolic Ca++ concentration from 100 nM to 4 microMoles?
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