Hormones secreted by endocrine glands belong to all the following chemical categories except

A. glycoproteins.
B. steroids.
C. polypeptides.
D. amines.
E. carbohydrates.


Answer: E

Biology & Microbiology

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Indicate whether the statement is true or false

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Some archaeal cells lack a cell wall.

Answer the following statement true (T) or false (F)

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Modern geologists estimate that the age of Earth is about

A) 450,000 years. B) 4.5 trillion years. C) 4.5 million years. D) 4,500 years. E) 4.5 billion years.

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Membrane rafts are found in the cytoplasmic membranes of

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