What is the definition of an antigen?
A. a protein produced by plasma cells that attacks pathogens
B. a type of white blood cell
C. anything the immune system recognizes as foreign to the body
D. a form of immune deficiency
E. a part of the membrane attack complex of the complement system
Answer: C
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In which of the following situations is genetic drift likely to occur?
A. A small population of lizards is isolated on a small island. B. A mouse develops a fur coat that enables it to hide more readily from predators. C. Two schools of tuna merge together to form one large population. D. A river changes course, changing the local environment for a population of butterflies.
At one point in human development, tissue connects the fingers, giving the hand a “webbed” appearance. Enzymes
eventually destroy the cells of the webbing and the fingers separate. These enzymes are probably localized in the ____.
a. chromosomes b. smooth endoplasmic reticulum c. lysosomes d. nucleus e. vacuoles
A type III survivorship curve is characteristic
of
a. dogs. b. goats. c. hawks. d. clams. e. horses
What should fire fighters do with their PPE in rehabilitation?
a. keep it on in cold or wet weather b. remove helmets, hoods and gloves c. keep it on d. remove it