The levels of organization from most simple to most complex are
A. cell ? chemical ? organ ? tissue ? system.
B. tissue ? cell ? chemical ? organ ? system.
C. chemical ? tissue ? cell ? organ ? system.
D. chemical ? cell ? tissue ? organ ? system.
Ans: D. chemical ? cell ? tissue ? organ ? system.
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patient with melanoma receives three types of therapy: surgery, radiation, and interferon. Which of these represents something the immune system uses against cancer as well?
A. Radiation -- a class of lymphocytes uses powerful electromagnetic radiation to attack "altered self" cells. B. Interferon -- TH cells and NK cells secrete interferon in response to tumor cells. C. Interferon -- NK cells insert interferon into the membranes of tumor cells, creating large pores that burst the cells. D. Interferon -- In complexes bound with MHC proteins, the interferons indicate the presence of altered tissue to B cells. Clarify Question What is the key concept addressed by the question? What type of thinking is required? Gather Content What do you already know about the actions of the immune system? 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?
How are the chromosomes of a eukaryote cell replicated?
a. The linear DNA molecules are replicated from multiple origins of replication bidirectionally. b. The linear DNA molecules are replicated from one origin of replication bidirectionally. c. The circular DNA molecules are replicated from multiple origins of replication bidirectionally. d. The circular DNA molecules are replicated from one origin of replication bidirectionally. e. The linear DNA molecules are replicated from one origin of replication unidirectionally.
The attenuated oral poliovirus vaccine, (OVP), is no longer administered in the U.S.A. because it
A) is very toxic. B) does not provide good immunity. C) can revert to wild-type virulence. D) can be spread to contacts. E) can be spread to contacts and can revert to wild-type virulence.
Cytokines are secreted by which cells?
A. B cells B. T cells C. Macrophages D. All of these cells can secrete cytokines.