The DNA of a eukaryotic cell is
a. double-stranded.
b. single-stranded.
c. circular.
d. complex inverted.
e. conservative.
Ans: a. double-stranded.
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Which of the following occurs during exhalation?
A. None of the answer options is correct. B. Negative pressure in the lungs increases. C. The diaphragm contracts and flattens out. D. Intercostal muscles elevate the ribs. E. The volume of the thoracic cavity increases.
Translational controls of protein levels in bacteria are governed by:
a. the rate at which small and large subunits of ribosomes assemble. b. the rate at which the cap and tail of pre mRNA are removed. c. the rate at which ribosomes attach to mRNA molecules. d. the concentration of proteins in the cytoplasm. e. the rate at which sugars are incorporated into the cell.
Water molecules are attracted to one another by _____
A) nonpolar covalent bonds B) ionic bonds C) hydrogen bonds D) hydrophobic interactions
Brad placed a drop of blood in some distilled water. What happened in the red blood cells?
A. The cells burst. B. The cells did not change. C. The cells shrunk. D. The cells divided into two identical cells. E. The cellular metabolism increased in rate.