A person is exposed to a drug that prevents vesicles from forming in neurons. Predict the effect this will have on nerve function
A) Voltage-gated potassium channels will be blocked, slowing depolarization and slowing nerve impulses.
B) Neurons will be hyper-excitable.
C) Neurotransmitters won't be released into the synapse via exocytosis.
D) Action potentials will not be carried through the axon.
Answer: C) Neurotransmitters won't be released into the synapse via exocytosis.
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Regarding the nature of natural selection, which of the following is NOT an accurate statement?
A) Populations evolve traits by natural selection that will be useful for future environmental changes. B) Natural selection acts on the phenotypes of individuals, but evolution occurs with changes in allele frequencies in populations. C) Natural selection can and does produce features that are less than perfect adaptations. D) Natural selection operates as a systematic, nonprogressive mechanism.
Which of the following hormones helps the body avoid dehydration and water overload?
A) oxytocin B) follicle-stimulating hormone C) thyroid-stimulating hormone D) antidiuretic hormone
The presence of known carcinogens in ETS supports the argument that ETS can cause lung cancer in nonsmokers
Indicate whether the statement is true or false
What do scientists who support the Miller and Urey model of the formation of the first organic molecules on Earth have in common with those scientists who support the hypothesis that organic molecules arrived on early Earth carried in a meteorite?
A) Both support the idea that the first organic molecules on Earth had their origins in outer space. B) Both support the idea that conditions on early Earth led to the formation of organic molecules in the atmosphere. C) Both support the idea that the first organic molecules on Earth were formed from inorganic molecules. D) Both support the idea that only living things can produce organic molecules.