Which of the following is true of chemokines?
A. They ensure production of enough leukocytes.
B. They are involved in B lymphocyte activation and differentiation.
C. They are chemotactic factors for leukocytes.
D. They cause basophils and eosinophils to degranulate.
E. They are substances used to signal between leukocytes.
Answer: C
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Compared to the sunflowers, birch trees are:
A. r-selected. B. K-selected. C. less competitive. D. All of the responses are correct. E. None of the responses is correct.
Ten songbirds are isolated at birth and not exposed to any adults' songs as juveniles. After six months, it is observed that they sing the normal adult songs of their species. What can be concluded about the singing behavior in this particular species?
A. It is a combination of innate and learned behavior. B. It is a learned behavior. C. It is a conditioned response. D. It is an innate behavior. E. It is an operant response.
A lab technician is preparing to dispose of a rat and a frog that were euthanized earlier in the day for a scientific study. Although the two animals died at the same time, the rat has rigor mortis while the frog does not yet show any signs of it. What is the best explanation for this time difference in the onset of rigor mortis?
A. The rat has higher concentrations of myoglobin in its muscles than the frog. B. All the frog's muscles are fast-twitch muscles. C. The rat's muscles have a greater density of myofilaments than the frog's muscles. D. The frog has lower concentrations of glycogen in its muscles than the rat. E. The rat is able to synthesize more ATP than the frog. Clarify Question · What is the key concept addressed by the question? · What type of thinking is required? Gather Content · What do you know about rigor mortis? What other information is related to the question? Choose Answer · Given what you now know, what information 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?
Antibodies detected by reacting rickettsial antigens with specific antibody followed by use of an anti-immunoglobulin with a fluorescent tag could be used to diagnose:
A) Rocky Mountain spotted fever B) Mycoplasma pneumonia C) stomach ulcers D) rheumatic fever