Predict the expected consequence(s) of applying a toxin that blocks voltage-gated Ca2+ channels in a neuron.
A. No resting membrane potential would be observed (i.e., measures at 0 mV).
B. A rapid increase in membrane potential at threshold voltage would not occur.
C. Membrane potential would increase rapidly to peak with an action potential, but would not decrease immediately afterwards.
D. The neuron would become hyperpolarized.
E. Neuron conducts action potentials normally, but would not transmit these potentials across chemical synapses.
E. Neuron conducts action potentials normally, but would not transmit these potentials across chemical synapses.
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An individual is moderately dehydrated and reaches for a beer to quench his thirst. Although this person thinks that he is hydrating himself, he is actually causing additional dehydration. Why is this the case?
A) The alcohol in the beer inhibits antidiuretic hormone. B) The alcohol in the beer causes a decrease in sodium reabsorption in the nephron. C) The alcohol in the beer inhibits aldosterone. D) The alcohol in the beer causes an increase in the activity of renin.
The mitotic spindle is a microtubular structure that is involved in _____
A) splitting of the cell (cytokinesis) following mitosis B) triggering the compaction and condensation of chromosomes C) dissolving the nuclear membrane D) separation of sister chromatids
When certain bodies of water develop regions known as "dead zones" it often means that:
A. Oxygen has been depleted. B. Carbon dioxide is not available. C. Nitrogen has become limited. D. Phosphorus has killed animals. E. Plant life no longer can survive.
Aside from the sample being a random sample from the target population, and the latent variable model determining function is correct, what critical assumption guarantees the consistency of the maximum likelihood probit and logit estimates for the coefficients?
A. The predictions need to be between zero and one. B. The coefficients are jointly statistically significant. C. The model errors and the treatment variables are independent. D. The sample size is large.