Although activation of the three different pathways of complement involves different components, the three pathways converge on a common enzymatic reaction referred to as complement fixation
A. Describe this reaction.
A. The cleavage of C3 into C3a and C3b and the covalent bonding of C3b to the pathogen surface is called complement fixation, and is the reaction on which the alternative, lectin, and classical pathways of complement activation converge.
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Why is it important to wear proper clothing while exercising in the cold? What types of clothing are recommended, and what types should be avoided?
What will be an ideal response?
Natural killer cells (NK cells) carry activating and inhibitory receptors on their surface
A. What property of NK cells do these receptors activate or inhibit, respectively? Explain your answer. B. How are NK cells thought to use these receptors to recognize and eliminate virus-infected cells? C. Why are the actions of NK cells categorized as innate immunity, and what do we know of their specificity for MHC class I molecules? D. Why do the NK cells of the recipient of an organ transplant sometimes attack the transplanted tissue?
Melody has been experiencing severe mood swings, feeling highly energized for a period and then experiencing extreme depression. These symptoms are most closely associated with
A) borderline personality disorder. B) generalized anxiety disorder. C) bipolar disorder. D) seasonal affective disorder.
Which of the following statements about sodium intake is true?
A. The maximum recommended sodium intake for adults is 100 milligrams per day. B. Sodium is an essential nutrient, but we only need about 1/10 of a teaspoon per day. C. Most of the sodium in our diets comes from sources other than salt. D. Most people should not try to reduce their sodium intake.