Answer the following question given this paragraph: A migraine is a more severe type of headache. It occurs when blood vessels in the head dilate, or expand. This may be triggered by certain foods, bright lights, weather changes, or other factors. People with migraines may also have nausea or other symptoms. Fortunately, migraines can often be relieved with prescription drugs. Q: When blood vessels in the head dilate, what kind of severe headache can occur? Choices: - malignant - chronic headache - tension headache - migraine A:
migraine
(Question)
Answer the following question given this paragraph: Q: Temporal and spatial summation at the axon hillock determines whether a neuron generates what? Choices: - hidden potential - change potential - false potential - action potential A:
(Answer)
action potential
Ques: Answer the following question given this paragraph: Some solutes, such as sodium acetate, do not recrystallize easily. Suppose an exactly saturated solution of sodium acetate is prepared at 50C. As it cools back to room temperature, no crystals appear in the solution, even though the solubility of sodium acetate is lower at room temperature. A supersaturated solution is a solution that contains more than the maximum amount of solute that is capable of being dissolved at a given temperature. The recrystallization of the excess dissolved solute in a supersaturated solution can be initiated by the addition of a tiny crystal of solute, called a seed crystal. The seed crystal provides a nucleation site on which the excess dissolved crystals can begin to grow. Recrystallization from a supersaturated solution is typically very fast. Q: What is used to recrystallize excess dissolved solute in a supersaturated solution? Choices: - starter crystal - energy crystal - fertilizer crystal - seed crystal A:
Ans: seed crystal
(Q).
Answer the following question given this paragraph: Q: Upon reaching the postsynaptic membrane, what type of chemical messenger binds to and activates a specific receptor? Choices: - hormone - neuropeptide - pheromone - neurotransmitter A:
(A).
neurotransmitter
Ques:Answer the following question given this paragraph: One type of molecular compound behaves quite differently than that described so far. A covalent network solid is a compound in which all of the atoms are connected to one another by covalent bonds. Diamond is composed entirely of carbon atoms, each bonded to four other carbon atoms in a tetrahedral geometry. Melting a covalent network solid is not accomplished by overcoming the relatively weak intermolecular forces. Rather, all of the covalent bonds must be broken, a process that requires extremely high temperatures. Diamond, in fact, does not melt at all. Instead, it vaporizes to a gas at temperatures above 3500C. Q: What is a compound in which all of the atoms are connected to one another by covalent bonds? Choices: - covalent bond element - covalent mixture - compound metal - covalent network solid A:

Ans:covalent network solid
Question: Answer the following question given this paragraph: Q: Does an increase in temperature speed up or slow down reactions? Choices: - end reaction - slow down - remain the same - speed up A:
Answer:
speed up