Which nutrient, when metabolized for energy, produces nitrogenous wastes?
A. vitamins
B. minerals
C. amino acids
D. lipids
E. carbohydrates
Answer: C
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Which of the following most adequately describes how the Alu element may have proliferated to constitute 10% of the human genome?
A. Retrotransposons show self-proliferation. B. A single retrotransposon can be copied into many RNA transcripts. C. Retrotransposons increase with every generation. D. Multiple retrotransposons code the same gene. E. Retrotransposons increase with each cell division.
The white, sticky, toxic liquid that runs through some plant veins and is particularly common in plants of the milkweed family is called ___________
A. filament B. nectar C. alkaloid D. latex E. tannin
Approximately how old is life on Earth?
A) 36 billion years old B) 3.6 billion years old C) 360 million years old D) 36 million years old
A disorder that has varying levels of severity is an example of ________.
Fill in the blank(s) with the appropriate word(s).