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.

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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

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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

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During what eon were dinosaurs and gymnosperms the dominant organism?

a. cenozoic b. archaean c. mesozoic d. phanerozoic e. jurassic

Biology & Microbiology