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Botulinum toxin blocks the release of ACh from the presynaptic axonal terminals of the motor endplate. What would you predict the effects of botulinum poisoning to be on synaptic transmission? Explain using what you know about transmission at chemical synapses. Do you expect this toxin to be lethal? Why?
If amino acid sequences might be useful in determining how closely related dissimilar species are but may not be very useful for identifying a particular species, suggest two reasons why.
DNA sequences differ between species due to substitution events, i.e. when new mutations arise and become fixed by drift or selection in one of the species.
The D. melanogaster genome consists of approximately 1.7 x 108 base pairs. If DNA synthesis occurs at a rate of forty base pairs per second, and the entire genome is replicated in ten minutes,
The proportion of adenine bases in the human genome is 27%. What is the probability of observing the six-nucleotide sequence TAGTTA from a random point in the human genome?
Two strains of the same species both contain known PCR primer sites for a gene that encodes for a virulence factor. However, the avirulent strain has a long insertion mutation in the PCR primer site that is not present within the virulent stain. H..
Myelin is important for action potential propagation. Multiple sclerosis is an autoimmune disease where the myelin sheath surrounding CNS axons is progressively lost. How will this degradation affect the generation of action potentials?
Charlies blood type was O and Joan was A, and they baby was bon B. what verdict would you reach ? list all the possible blood types of men who could be the father of Joan's baby?
Comparisons of amino acids sequences can shed light on the evolutionary divergence of related species. Would you be expecting all the proteins of a given set of living species to demonstrate the same degree of divergence.
How might our understanding of Mendelian genetics allow us to predict the outcome of genetic crosses? What are some limitations of Mendelian genetics on our ability to make these predictions?
Explain how the normal pattern of depolarization is affected by bundle-branch block. What might cause bundle -branch block?
In the procedure of carbon fixation, RuBP attaches CO2 molecule to produce a six carbon molecule, which is then split in two. After phosphorylation and reduction, what more needs to occur in the Calvin cycle.
1.The ultimate source of energy for almost all living organisms is.. 2. The life and death of cells are governed by.. 3. An organsim can exchange matter and energy with its surroundings.
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