A trapeze artist loses her grip and falls off the trapeze, causing her heart rate to increase in response to the fear of falling
(despite the net below to prevent injury). Which type of neurons is directly responsible for this increase in heart rate?
a. afferent neuron
b. efferent neuron
c. interneuron
d. motor neuron
e. Schwann cells
ANSWER: b
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Agammaglobulinemia is strictly an environmental disease. Indicate whether the statement is true or false
Rank, from low to high, the pH of blood, stomach acid, and urine
A) blood, urine, and stomach acid B) stomach acid, blood, and urine C) urine, blood, stomach acid D) stomach acid, urine, blood
A eukaryotic cell organelle is found to have its own DNA and to make some of its own ribosomes. It also can make some protein without the help of DNA in the cell's nucleus. Propose an explanation for the origin of this organelle
A) intracellular evolution from latent bacterial DNA B) symbiotic merger of bacteria into a eukaryotic cell with the bacterial cell becoming the organelle C) symbiotic merger of two bacteria cells; one becoming the nucleus, the other becoming the organelle D) viral transmission of DNA from a bacterium to a eukaryotic cell
Some students consume large amounts of coffee and so-called energy drinks to help them stay alert when studying. You notice that many who engage in this practice seem to do poorly on exams. Suppose you want to investigate the relationship between caffeine consumption and exam performance. Which of the following statements would be an appropriate hypothesis?
(a). Students who consume large amounts of caffeine while studying will have lower exam scores than those who consume less caffeine. (b). One should avoid consuming too much caffeine while studying. (c). Too much caffeine is harmful to your health. (d). Many students consume large amounts of caffeine while studying. (e). Caffeine increases alertness but also increases anxiety.