Examination of a phenotype can always determine the genotype of an organism
__________________ Indicate whether the statement is true or false.
F, cannot
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Photoperiodism is the
a. duration of flowering in a plant. b. amount of light needed by a plant to exhibit normal growth. c. biological response of a plant to a change in the length of daylight relative to darkness. d. light phase of photosynthesis during which photolysis of water occurs. e. time of the day when light shines.
Effector B cells secrete antibodies that are ____ those produced by the original B cell from which they arose, which
then ____.
a. identical to; flag antigens for phagocytosis and prevent them from attaching to body cells b. different than; help antigens attach to body cells c. identical; prevent antigens from clumping together to d. different than; present them on the surface of dendritic cells e. in addition to; flag antigens for elimination by urination
The emergence of new infectious diseases is probably due to all of the following except
a. the need of bacteria to cause disease. b. the ability of humans to travel by air. c. changing environments (e.g., flood, drought, pollution). d. a pathogen crossing the species barrier. e. the increasing human population.
The perforin-granzyme pathway involves
A) the production of fever, which kills the pathogen. B) the production of antibodies toward the invading pathogen. C) the synthesis of special cell-killing proteins that act on infected or abnormal cells. D) presenting the foreign antigen to B cells. E) binding CD95L to infected cells, which eventually leads to cell apoptosis.