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The star that is currently closest to the North Celestial Pole is:

An eccentric billionaire wants to build a mansion in a location on Earth where the effect of the seasons is the least pronounced — where summer and winter are not that different. Where should his personal astronomer advise him to build?

In Ptolemy’s system the planets orbit the Earth and not the Sun. How did the system explain the retrograde motion of planets like Jupiter?

In Newton’s Law of Gravity, the force of gravity goes up as the:

To leave the gravitational pull of the Earth, and explore other planets, satellites must have at least:

Transmitter-gated ion channels have a similar structure, with each subunit containing 

Below is a recording of the Vm in a postsynaptic neuron. How would you best describe the region within the brackets (marked with an asterisk(*))? 

Which correctly describes the status of the voltage-gated K+ channel during the falling phase of an action potential?

Which neurotransmitters are both excitatory?

What receptor can bind benzodiazepines, barbiturates, and ethanol?