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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The enzyme ________ breaks down the extracellular matrix to facilitate angiogenesis.
Fill in the blank(s) with the appropriate word(s).
How do protein kinases generally activate their target proteins?
A) The process of phosphorylation causes the target proteins to change conformation. B) The kinases bind to target proteins directly, forming a complex that activates the proteins and lets them change conformation. C) Kinase concentrations vary during the cell cycle, so that proteins are activated only when kinase levels are high. D) Kinases bind to target proteins and inactivate them, so kinase levels must drop for target protein activation. E) The process of dephosphorylation causes the target proteins to change conformation.
Which term can be used to describe the majority of protists?
a. aerobic b. photosynthetic c. anaerobic d. autotrophic
Altogether, the body secretes about 7 liters of water into the alimentary canal each day. About what percentage of this water gets reabsorbed?
A) 30% B) 50% C) 75% D) 90%