7. You stimulate a presynaptic cell and record from the postsynaptic neuron of each pair. For each mutation below, describe the following: i) After the first stimulus, how does the excitatory postsynaptic potential (EPSP) you record from the postsynaptic neuron differ from the EPSP recorded from a wild-type animal? Does it increase, decrease, stay comparatively the same, or fail to be generated at all?

ii) After five stimulations of the presynaptic cell in quick succession, how does the EPSP you record from the mutant animal differ from that in the same experiment on a wild-type animal?
Explain your reasoning in each case.

The mutations are as follows:
7A. Mutation of the voltage-gated Ca2+ channels of the presynaptic terminal. The mutant channels have a lower opening threshold.

7B. Mutation of the Ca2+ binding sites of synaptotagmin. The mutant protein does not bind Ca2+.

What element is able to combine with itself and hydrogen to form large molecules ?

Which statements best describe the differences or similarities between a comparative investigation and an experimental investigation? check all that apply. experimental investigations are best for showing cause-and-effect relationships, while comparative investigations do not necessarily show this type of relationship. comparative investigations are often impractical and unrealistic, while experimental investigations are the most practical and realistic kinds of investigations. comparative investigations allow for the use of a wide range of variables but do not have a control group, while experimental investigations involve variables that can be controlled. both experimental investigations and comparative investigations are designed to answer scientific questions. both experimental investigations and comparative investigations focus on making observations rather than collecting new data.

Which statement best describes the role of religion and culture in ancient medicine?