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The human appendix, a vestigal extension off the large intestine, is homologous to a structure called a caecum, generally larger than our appendix, and houses bacteria that aid in digesting cellulose, the main component of plants.
Explain how the presence of the appendix might be used to show our common ancestry with other mammals, and determine what it might tell us about the dietary history of humans. Provide an example with your response.
Geneticists compare DNA base sequences among organisms and from this data determine a gene's rate of evolution. Different genes have been found to evolve at different rates. Explain why some genes might have faster rates of evolution than other genes as populations adapt to their environments, and give an example with your explanation.
Beaker A contains 25 percent salt solution. A differentially permeable bag (permeable to water not salt) containing 50 percent salt solution is allowed to float on top of the solution in Beaker A. What will occur.
What were the components of the pectoral girdle in early fishes and how has it changed in tetrapods? Specifically, what is the typical fate of the coracoids and clavicle in the tetrapod girdle?
Draw and label the regulatory regions and transcriptional regions of a typical prokaryotic and a typical eukaryotic gene.
Which of the key vertebrate characteristics are present in the mammalian lineage?
the required reagents involved in making the PCR work.
Create a Dichotomous Key using the following Bacteria. You are only allowed to use the characteristics listed in organizing your Dichotomous Key.
describe three mechanisms that our body has to fight cancerous cells. what are the three ways cancer circumvent our defenses.
How would you do the experiment described differently so that labeled mitotic figures would be observed?
Explain, in a sequential fashion, the steps involved in the initiation and propagation of an action potential including all neurotransmitters and ions involved in the process.
One threat to populations within an ecosystem is an invasive species. In the American Southwest, certain areas are being invaded by non-native, Africanized Honey Bees. This aggressive, non native bee is a prolific breeder and some estimate that it..
Create and label a generalized life cycle of Fungi with special reference to ploidy. Label plasmogamy and karyogamy in the life cycle.
The Na+ -K+ ATPase is also known as the Na+-K+ pump. It is responsible for maintaining the high extracellular sodium ion concentration and the high intracellular potassium ion concentration. What happens immediately after the pump hydrolyses ATP?
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