Species of Streptococcus and Staphylococcus produce_____, substances that are toxic to white blood cells, including phagocytes
Fill in the blank(s) with the appropriate word(s).
leukocidins
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H1 binding to DNA is different than that of the other four histones because H1 binds to:
A. the major groove of the DNA only. B the DNA as it comes off both sides of the nucleosome. C. as a component of the octamer; however, unlike H2A, H3, and H4, H1 lacks the histone tail. D. one strand of the linker DNA as it comes off the nucleosome and binds a second site in the central region of the DNA supercoil. E. the DNA as a homotetramer.
In your Ph.D. research, you use thin slices of brain tissue to study neuronal signaling. You attach an electrode to a single neuron, but cannot detect any activity. What is the most likely explanation?
A. When you sliced the brain, you disconnected the cell from its dendrites. B. Neurons are not electrically active -- you should be recording neuroglia instead. C. When you sliced the brain, you disconnected the cell from its neuroglia. D. Excessive myelination is blocking inputs to the cell. 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 neuronal signaling? 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?
List the three major groups of pinnipeds and outline the anatomical differences between them
What will be an ideal response?
The characteristic that makes the muscle cells unique is the relative abundance and organization of
A. collagen fibers. B. actin and myosin fibers. C. keratin fibers. D. gelatinous mass. E. fibroblast cells.