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Question: Assume that each excitatory presynaptic neuron causes a 0.5mv depolarization of the postsynaptic neuron, and each inhibitory presynaptic neuron causes a 0.5mv hyperpolarization of the postsynaptic neuron. What would be the effect on the postsynaptic neuron if 87 excitatory neurons and 57 inhibitory pre-synaptic neurons fired simultaneously? SHOW ALL WORKQuestion: What would be the total mv produced by the 87 excitatory neurons (also indicate sign)? ______Question: What would be the total mv produced by the 57 inhibitory neurons (also indicate sign)? ______Question: What would be the net change in voltage and indicate whether it is (+) or (-) ? ______________Question: Assuming that the threshold for generating an action potential is -55 mv and the resting potential is -70mv, is the net change in voltage enough to reach threshold? ______________
Eukaryotes, one complete set of nuclear chromosomes Note that Eukaryotes also possess a mitochondrial genome thus plants have a chloroplast genome and a mitochondrial genome What about fungi? What is the source of those organellar genomes.
Can you help me derive the equations necessary to compute Km and Vmax with a given observed velocity at two substrate concentrations. What is Vmax and Km if you know Substrate1 and Substrate2 and the matching Vobs1 and Vobs2.
Certain unscrupulous operators offer, for a fee, to freeze recently deceased individuals in liquid nitrogen until medical science can cure the disease from which they died. What is the biochemical fallacy of this process.
Think about the two linked traits in a population in which half of the individuals are double heterozygotes with genotype AB/ab and the other half are double homozygotes.
A seven cm potato sliced is placed into an unknown solution. After the slice is immersed for one hour, the potato slice now measures six cm.
Discuss how do the results of this experiment relate to the role yeast plays in baking? What would you expect to see if the yeasts' metabolism was slowed down?
Madagascar, Indonesia and the Amazon basin have some of the greatest numbers of different species concentrated in a single area. What kinds of environments do you think encourage greater biodiversity.
There is a general agreement that life should have evolved in the oceans originally and only much later invaded land. What factors of the physical environment on the early and evolving Earth support these ideas? Changes in which of these factors were..
Mrs. Mulligan goes to her dentist and, after having a couple of cavities filled, her dentist strongly suggests that she reduce her intake of sodas and increase her intake of calcium phosphates in the foods she eats. Why give appropriate reasons.
Use the I/v curves for leak and INa describe how the treshold of an action potential can be dtermined and the peak height.
Trace a drop of blood from tissue cells of the left knee to capillaries of the right arm. Be sure to stop at the lungs along the way! Keep track of the left and right sides of the heart, and mention all the valves through which the blood travels.
Carotenoids are frequently found in foods that are considered to have antioxidant properties in human nutrition. What related function do they have in plants.
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