Which of these is the major antigen processing cell type in the body?
A. T Cell
B. Dendritic Cell
C. Neutrophil
D. B Cell
E. Fibroblast
Ans: B. Dendritic Cell
You might also like to view...
A plant sustains pathogen-induced damage to one of its cell walls. A gene-for-gene response soon follows and the tissue surrounding the injury soon dies. Which signaling molecules facilitated this response?
A. Oligosaccharins B. Ethylene C. Gibberellins D. Auxins E. Abscisic acid Clarify Question · What is the key concept addressed by the question? · What type of thinking is required? · What key words does the question contain and what do they mean? Gather Content · What do you already know about injury response in plants? How does it relate to the question? Consider Possibilities · What other information is related to the question? Which information is most useful? 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?
You are "living off the grid" meaning that you are not using any public utilities: no water supply, sewer connection, natural gas, or electricity. You do have a septic tank, whose pipe carries sewage underground where it is released over a wide area, the leaching field. There is also a small pond out there that you have stocked with fish. However, you notice that the fish are floating dead in the water, and the pond has a green scum on it. What happened?
A. There are not enough nutrients in the water, so the fish died. B. Chemical toxins from your septic tank cleaner have killed the fish. C. There is oxygen depletion in the pond due to the leakage of phosphates and other compounds from your septic tank. D. The fish died due to a lack of calcium, which then caused the algae to overgrow.
All cells are fundamentally similar at a structural level. Using the accompanying diagram of a generalized human cell,
name as many of the numbered labels as you can to illustrate this idea. What will be an ideal response?
How does the lactose repressor block transcription of the lactose operon?
a. by "turning off" the appropriate genes in the intron b. by regulating the activity of the enzymes that the operon codes for c. by binding allosterically to the appropriate genes d. by slowing the uptake of lactose into the cell e. by binding to the operator