Which of the following statements is incorrect about shigellosis?
A. It frequently complicates to sepsis.
B. Outbreaks have occurred in day care centers.
C. It is also called dysentery.
D. Symptoms include watery diarrhea with bloody, mucoid stools and abdominal cramps.
E. Human carriers cause fecal transmission.
Answer: A
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Which of the following is mismatched?
a. acetylcholine; muscle contraction b. endorphin; pain perception c. norepinephrine; fight-or-flight response d. serotonin; sexual function e. GABA; major inhibitor in the brain
If you cross pea plants that are both heterozygous for purple flowers and yellow seeds (PpYy), and you examine 800 offspring for flower and seed color, about how many do you expect to have white flowers and green seeds?
A) All of them (800) B) 150 C) 450 D) None of them E) 50
You are studying a gene which, when mutant, causes oligodendrocytes to enwrap shorter sections of axon, so that nodes of Ranvier are more closely spaced. What is the likely effect on nerve impulses?
Nodes of Ranvier are the spaces between sections of axon enwrapped with myelin. Because myelin creates an insulating layer that prevents ion flow, the progress of the action potential "jumps" from node to node, thus speeding up transmission down the axon. A. They will travel faster. B. They will travel slower. C. They will increase in amplitude. D. They will decrease in amplitude. E. They will travel laterally across connected axons. Clarify Question · What is the key concept addressed by the question? · What type of thinking is required? · What key words does the question contain? Gather Content/Choose Answer · What do you already know about nodes of Ranvier? How do they relate to nerve impulses? Consider Alternatives · What other information is related to the question? Choose Answer · Given what you now know, what information and/or problem solving approach is most likely to produce the correct answer? Reflect on Process · Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
Staphylococcus epidermidis isolated from your nose or throat may be playing a protective role in your body.
A) True B) False