Arrange in the correct sequence these components of the mammalian immune system as it first responds to a pathogen. I) Pathogen is destroyed. II) Lymphocytes secrete antibodies
III) Antigenic determinants from pathogen bind to antigen receptors on lymphocytes. IV) Lymphocytes specific to antigenic determinants from pathogen become numerous. V) Only memory cells remain. A) I ? III ? II ? IV ? V
B) II ? I ? IV ? III ? V
C) IV ? II ? III ? I ? V
D) III ? IV ? II ? I ? V
D
You might also like to view...
John Bernal suggested that prebiotic synthesis of polymers took place on clay because
A. Clay minerals are known to bind organic molecules. B. Clay is negatively charged and attracts cations. C. Some minerals in clay attract organic monomers and catalyze chemical reactions. D. Clay minerals can attract and bind organic molecules, catalyze chemical reactions and attract cations. E. Clay is positively charged and can bind organic molecules for polymerization.
Bacterial cells are placed into a 250mL liquid growth medium in a closed laboratory flask. According to Malthusian theory, they will reproduce exponentially and then:
A. continue reproducing arithmetically as long as there are no limitations on food supply. B. continue reproducing geometrically as long as there are no limitations on food supply. C. continue reproducing arithmetically until the food supply is used up, then they will cease to grow. D. continue reproducing geometrically until the food supply is used up, then they will cease to grow.
Chemotaxis is a process by which bacteria
A. respond metabolically to the presence of autoinducer molecules. B. avoid phagocytosis. C. move on solid surfaces by means of type IV fimbriae. D. move toward an attractant or away from a repellent.
Which wavelengths of light are most likely to be absorbed by chlorophyll b?
A. UV B. blue C. red D. infrared