Which of the following can serve as antigens?
a. proteins
b. carbohydrates
c. nucleic acids
d. proteins and carbohydrates
e. proteins, carbohydrates and nucleic acids
E
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Pedigree construction can be a difficult task
a. True b. False Indicate whether the statement is true or false
Aside from the traditional hypothesis that life on Earth developed via organic compounds produced in
a reducing atmosphere, which of the following alternative hypotheses is most likely?
a. Life could have arisen from the organic compounds formed around hydrothermal vents far below the ocean floor. b. Life could have developed on another planet and was then delivered by meteorites. c. The organic compounds necessary for life were delivered to Earth by meteorites. d. Life on Earth may have arisen inside land-based volcanoes. e. The organic compounds necessary for life could only have been produced in an oxidizing atmosphere
When you are lifting weights, the arterioles
servicing your biceps are
a. constricted. b. dilated. c. supplying less blood. d. shut down. e. doing more than one of these
Active transport mechanisms
a. in roots regulate what solutes enter the plant. b. in leaves help control water loss. c. operate in animal kidneys and neurons. d. do all of these. e. do none of these.