Rheumatoid arthritis is the most threatening form of arthritis and often results in a replacement prosthesis of the damaged joint. Explain how this form of arthritis differs from other forms
What will be an ideal response?
Rheumatoid arthritis is an autoimmune disease in which the body attacks its own synovial membranes. Rheumatoid arthritis is a permanent condition; therefore, eventually the cartilage will be destroyed, and the only treatment is to replace the damaged joint. In contrast, osteoarthritis involves degeneration of joint surfaces caused by wear and tear; it is not an autoimmune disease.
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Ehrlichiosis, Rocky Mountain Spotted Fever, dengue fever, and tularemia are all infectious diseases of the cardiovascular system. What feature do they have in common?
A. They are all transmitted by arthropod vectors. B. People with immune deficiencies are especially susceptible to these diseases. C. They are all endemic in the mountain states in the western U.S. D. The causative agent of each of these diseases is a bacterium.
What structures in the cell of a fungus are not present in animal cells?
a. cell walls of cellulose and chloroplasts b. cell walls of cellulose c. cell walls of chitin and chloroplasts d. cell walls of chitin
Suppose that you have been able to partially sequence a significant number of cDNA clones from an as yet unsequenced insect genome. These clones are useful as what sequences that can help annotation?
What will be an ideal response?
Consider the consequences of a harmless prey that evolves toward mimicry of a model that has an antipredator defense (Batesian mimicry). What happens to the effectiveness of this defense as more and more prey in the population are harmless mimics? Then consider what happens when a species with bad taste evolves to resemble a model that stings (Mullerian mimicry).
A. The increased number of Batesian mimics dilutes or weakens the protection afforded by the warning color pattern, but the addition of more Mullerian mimics only strengthens the protective mimicry complex. B. The number of both Batesian and Mullerian mimics is limited because both dilute the protection afforded by the warning color pattern. C. The number of Mullerian mimics is limited because they dilute the protection afforded by the warning color pattern, but the addition of more Batesian mimics only strengthens the protective mimicry complex. D. The number of both Batesian and Mullerian mimics is unlimited because they both reinforce the protection afforded by the warning color pattern.