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Tetrodotoxin is a protein toxin from puffer fish that blocks the opening of voltage-gated sodium channels at quite low doses. Assume a researcher applies this drug to just the postsynaptic pair of two neurons (the presynaptic neuron we will assume is the mechanically-sensitive spinal neuron described above, and the post-synaptic cell is a relay neuron receiving input from the first cell in the spinal column).Draw the response of the post-synaptic cell to three stimuli of different intensity (gentle, medium, and intense). Be sure to label all axes.
Assume you have a protein solution of concentration 3 M. You require to make a series of six dilutions of 300 mM, 30 mM, 3 mM, 300 mu M, 30 mu M, and 3 mu M.
Would you expect the salivary gland cells to possess the monoploid or diploid number of chromosomes for the D. virilis species.
A typical tumor doubles in size only every 100 days (although this varies significantly depending on the type of tumor). Can you speculate on why this is so much slower than the rate at which the genome can replicate?
Explain the three kinds of the mammals based upon how their young grows.Explain briefly the functions of sensory neurons, inter-neurons, and motor neurons in nervous system.
Determine which types of cells can we derive continuous cell lines? From which types of cells can we? Derive finite cell lines? From which types of cells do we derive mature differentiated cells?
you now hyperventilate for 30 seconds into and out of a paper bag. are the posthyperventilation effects any different than in question 1 ? why or why not.
Develop a labeled diagram of a small section of the plasma membrane and briefly describe its structure and function.
A karyotypically normal couple has a child with trisomy twenty-one Down syndrome. DNA analysis if 21q polymorphic markers reveals the following results.
What offspring phenotypes would you expect from mating between a 15-cm and 30-cm pig. How many pairs of genes are regulating the tail length character? (Hint: count the phentotypic classes, or find out the sum of the ratios of the classes)
Explain the role of double helix in complimentary base pairing in DNA replication. What does it mean when we say that the two strands of DNA in the double helix are antiparallel?
What is the frequency of heterozygotes (Aa) in a population in which the frequency of all dominant phenotypes is 0.25 and the population is in H-W equilibrium?
Discuss and explain why is it difficult to separate large amounts of RNA and DNA using gel electrophoresis?
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