Radioactive ____ is commonly used to treat patients with dangerously overactive thyroid glands
a. carbon
b. radium
c. iodine
d. thallium
e. cobalt
C
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What conclusions can be drawn from the studies on bent grass in a copper-polluted field and the
neighboring population in a non-polluted field?
a. Flowers in the polluted field will not survive. b. The one population now requires copper to survive. c. They have different flowering schedules, so isolation may be developing. d. They have different types of gametes, so isolation has taken place. e. They show no differences.
The liberated carbon dioxide that strong evidence supports as the cause of global warming is being released from what source?
1.nuclear energy 2.solar power 3.burning fossil fuels 4.wind turbines
When bacteria are exposed to nutrient-poor conditions, they form thick-walled structures that contain the chromosome and a small amount of cytoplasm. These structures are called
A. nucleoids. B. endospores. C. exospores. D. pseudomonads. E. plasmids.
A protein that speeds up chemical reactions without being consumed in the process is called a(n) ________
Fill in the blank(s) with correct word