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Define the biological species concept (1). For what kinds of organisms is the concept useful? (2) Give two concrete examples of when the biological species concept does not work and explain why it fails (2).
What is the metabolic exchange between rhizobia and their plant hosts? What does the plant provide in addition to carbon and how does leghemoglobin play a role in this? What metabolic feature of the bacterium is useful to the plant.
Based on the amount of dissolved gases in water, do you see a possible evolutionary reason why mammals never have any underwater breathing mechanisms?
Analysis of preserved leaves shows that the density of stomata per unit area has decreased over the past 200 years. Suggest (and support) a hypothesis that explains this phenomenon.
Describe two chromosome elongation techniques used in cytogenetic laboratory and their mechanisms. Please explain.
A 67 year old man with a history of cigarette smoking and systemic hypertension collapses suddenly ans is reshed to the emergency room. Laboratory sties and an EKG confirm an acute myocardial infarction. The pateint is stabilized in the intesive c..
Describe the structural changes that had to happen to support this move and discuss the functional importance of each of these structures to the environmental changes the plants had to face.
How do muscle fibers contract? Describe why ATP and metal ions are important. Describe the motor proteins, cytoskeletal elements, and other accessory proteins that are involved and what purpose each component serves.
Describe the path of electrons and light from H2O and Photosystem II to ATP and NADPH+.
Define and distinguish between taxonomy and systematics. explain how the binomial system used to identify species. Finally, list the levels of taxonomic groups in order.
If a restriction endonuclease "cuts" 2 DNA molecules at the same location, what can be assumed is identical about the molecules at the location?
Which of the following does NOT have a role in speech?
How can caffeine cause a muscle fiber to contract and generate force, but without generating an end plate potential or action potential of the membrane?
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