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Question: Discuss how does the method used today for exciting action potentials differ from the physiological methods? Does the electrical method effect how the action potential is propagated to the next nerve? Explain your answer.
Approximately half of our vitamin K is synthesized by bacteria in the colon. Based on this information, why might taking a broad spectrum antibiotic produce frequent nosebleeds.
Think about the nature of negative-feedback control and the function of the respiratory system, what effect do you predict that a decrease in CO2 in the internal environment would have on how rapidly and deeply a person breathes?
Explain the interaction of calcium with other proteins and how this alternate control system affects the rate and duration of smooth muscle contraction.
Determine which of the following is examples of disruptive selection and which of the following describes balancing selection.
The complement system and innate immunity via Toll-like receptors play critical roles in immune defenses against pathogens. These two systems traditionally have been considered to be separate.
Assume you infected an E. coli culture with a virulent bacteriophage. Most of the cells lysed, but a few survived - 1x10^-4. You wonder where the resistant bacteria came from.
You cross an M1M2 father with an M2M3 mother and ?nd out that the mean number of nosehairs in dissimilar marker genotypes in their offspring are as follows.
The brown and scarlet mutations assort independently. If fruit flies that are heterozygous for both of these mutations are intercrossed, what sorts of progeny will they create, and in what proportions? Describe how you got the answer.
Primary transcripts produced by RNA polymerases are generally faithful copies of the DNA template. However, most final/functional forms of these RNAs vary substantially from the primary transcript.Give an instance of an RNA class.
For a particular assay, you need cells at a concentration of 300 cells per ml. In your flask of cells growing you counted a sample using a hemacytometer.
Discuss when flavoprotein transfers electrons directly to final electron acceptor, hydrogen peroxide is produced. What other consequences might result from electron carriers in the ETC being bypassed?
The nucleotide composition of a virus is 10 percent Adenine, 15 percent Thymine, 45 percent Cytosine, and 30% Guanine. Can you predict that the DNA has the double helical structure?
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