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Botulinus toxin causes paralysis. It binds to presynaptic sites at the motor end plate (neuromuscular junction) and prevents the exocytotic release of transmitter from vesicles. Predict the consequences (increase, decrease, no change & explain why) of blocking the release of acetylcholine at the neuromuscular junction on the following: 1. Presynaptic resting potential 2. Presynaptic action potential amplitude 3. Presynaptic Ca2+ influx 4. Presynaptic transmitter release 5. Postsynaptic resting potential 6. Postsynaptic end plate potential 7. Postsynaptic action potential amplitude 8. Postsynaptic action potential frequency 9. Muscle contractile strength
Discuss the concept of species. What ways do modern taxonomists use to distinguish different species? Please provide a detailed, complete answer.
In a cross between a purple flowered plant and a white flowered plant, all 73 of the offspring had purple flowers. What are the most probable genotypes of the parent plants.
On an autosome, genes A and B are twenty map units apart. An AABB male mates with an aabb female. Determine % of the gametes produced by their hybrid offspring will be Ab?
Patients in renal failure may have to have dialysis in order to survive. Describe the different types of dialysis and why they help the patient's survival.
There are 100 cats. 25 of them are pure white, the others are darker. Determine the homozygous recessive, homozygous dominant, and heterozygous allelic frequencies.
Explain the development of Anabaena heterocysts. Include the names of important structures and compounds.
Suppose a primer initiates the replication process in E. Coli and forms a 20bp (base pair) long stretch. Assume an error rate of 2/1000bp in primer that is taking place only in the lagging strand of DNA during replication.
when conducting phenol red broth fermentation test, some microbiologists inoculate two sets of broth, one with carbohydrate and one without (PR Base Broth). Given that an uninoculated control is used to increase the reliability of the test, why wo..
Give examples of 2-different relationships that fungi have with other organisms. Indicate the type of relationship and explain why it was classified as such.
Many organism withstand periods of oxygen debt (anaerobic condition). Yeast undergoing oxygen debt converts pyruvic acid to ethanol and carbon dioxide.
In the absence of an inducer molecule, will lac repressor proteins (encoded by the lacI gene) be bound to the lac operon? If so, where will they bind?
What traits of corn make using corn kernels (starch) unattractive as a starting material for bioethanol.
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