Apoptosis has been implicated in a great number of disease states. Which of the following is probably not a consequence of errors in apoptosis?
A)A cell population that is triggered to undergo apoptosis would be diminished. An example is that HIV signals apoptosis in an important immune cell called the T helper cell. The reduction in T helper cells leads to the diminished immunity in Acquire Immunodeficincy Disease (AIDS).
B)Failure of apoptosis in menstruating women could lead to cells that persist beyond their normal monthly cycle. A condition similar to this would be endometriosis.
C)Excessive apoptosis would lead to cancerous growth of cells. An example is the inhibition of tumor suppressor genes like p53.
D)Removing the tissue between fingers and toes during development relies on apoptosis. Thus, failure of apoptosis could lead to webbed toes.
C)Excessive apoptosis would lead to cancerous growth of cells. An example is the inhibition of tumor suppressor genes like p53.
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Answer the following statement true (T) or false (F)
Which of the following occurs when the articular cartilage is damaged?
A) The matrix begins to break down. B) The exposed surface appears rough. C) Friction in the joint increases. D) Normal synovial joint function is unable to continue. E) All of the answers are correct.
Saliva is
A) stimulated by sympathetic innervation. B) slightly acidic, with a pH of 6-7. C) secreted from endocrine glands. D) slightly acidic, with a pH of 6-7 and controlled by the autonomic nervous system. E) controlled by the autonomic nervous system.
When two or more polypeptide chains come together to give a protein its ultimate shape, that structure is described as the ________ structure.
A. quaternary B. secondary C. heme group D. micro- E. tertiary