Until renamed by Paul Ehrlich in the 1890s, the heat-labile, nonspecific part of the immune system that enhances inflammation was known as "alexin". We now know that various proteins of this system attract neutrophils to tissues, direct phagocytosis of targets by neutrophils and macrophages, burst pathogens by insertion of the membrane attack complex (MAC), stimulate histamine release, and increase capillary permeability. What did Ehrlich rename this part of the immune system?
A. complement
B. contingent
C. Toll-like response
D. acquired immunity
E. MBL
A. complement
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Bacterial proteins were radioactively labeled and fed to phagocytic cells. The proteins within the phagocytic cell became increasingly more radioactive over time. This observation is the result of the activity of
A) mitochondria. B) chloroplasts. C) lysosomes. D) peroxisomes. E) the Golgi apparatus.
Which source of energy powers the light-independent reactions of photosynthesis?
a. light b. ATP and NADPH c. photosystem 2 d. glucose e. NADP+
The ____ gland is associated with biological clocks or biorhythms
a. pineal b. parathyroid c. hypothalamus d. pituitary e. thymus
Enzymes used to insert a foreign gene into a plasmid include
a. DNA ligase. b. vectors. c. restriction enzymes. d. both a and c.