The nucleus in a eukaryotic cell is surrounded by
a) chromatin.
b) a nuclear envelope.
c) histone proteins.
d) nucleoli.
Ans: b) a nuclear envelope.
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Eukaryotic cell membranes use many sterol molecules for construction, which contrasts with archaeal membranes that utilize ________.
Fill in the blank(s) with the appropriate word(s).
Fermentation occurs in:
A. anaerobic organisms only. B. some aerobic organisms, such as yeast, even in the presence of oxygen. C. only in bacteria, fungi, and plants.
The most certified Fair Trade product in the United States is
A) coffee. B) bananas. C) tea. D) chocolate. E) chicken.
What are electrolytes?
a. specialized tissues that conduct nerve impulses b. compounds that provide energy for physical exertion c. salts and other chemicals dissolved in body fluids d. nutrients required for body temperature regulation