A sugar or other molecule in which radioisotopes have been substituted for some atoms is a(n)
a. enzyme.
b. reactant.
c. tracer.
d. subatomic particle.
e. quark.
C
Biology & Microbiology
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Th17 cells are important in the first stages of the adaptive immune response
Indicate whether the statement is true or false.
Biology & Microbiology
Which of the following is NOT a characteristic
of the arctic tundra? a. a perpetually waterlogged soil b. rapid nutrient recycling c. one of the world's greatest store of carbon d. permafrost e. cool, anaerobic conditions
Biology & Microbiology
Cells that possess a nucleus and a membrane system that establishes internal compartments belong in which of the following groups?
A) eukaryotes B) viruses C) Archaea D) Bacteria
Biology & Microbiology
During what eon were dinosaurs and gymnosperms the dominant organism?
a. cenozoic b. archaean c. mesozoic d. phanerozoic e. jurassic
Biology & Microbiology