Which characteristic is correlated with cancer cells and metastasis?
a. gain of nuclear-cytoplasmic controls governing cell growth and division
b. changes in adhesion proteins on membrane surfaces
c. expansion of the cytoskeleton
d. normal chromosome number
e. deceased blood supply to the tumor
ANSWER: b
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Which of the following is not true about the G + C content percentages in DNA of organisms?
A. Similar G + C percentages only suggests relatedness if the two organisms are also alike phenotypically. B. Organisms with different G + C percentages have dissimilar base sequences. C. Organisms with similar G + C percentages have similar base sequences. D. All of the choices are correct.
Social behavior depends on
a. genetic similarity. b. bonding early in youth. c. communication. d. diversity. e. polymorphism
Nearly everyone has benign tumors in their ____
a. skin b. large intestines c. kidneys d. brain e. liver
Which of the following statements about phospholipids is TRUE?
A) Each one has two fatty acid chains and the glycerol backbone is bonded to a small polar group B) the glycerol backbone is bonded to a small nonpolar group C) Each one has three fatty acid chains D) Their biological function remains unknown